The Premier Soil Investigation CompanyGEOTECH Si

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979

Our Mission

About

To provide reliable, accurate and comprehensive

geo-technical data to ensure that developers,

engineers and architects can conceive and design

engineering structures and facilities of optimal value.

We will ensure the highest professional standards

in all our services by employing experienced and

capable staff and deploying modern equipment and

investigation techniques at all times.

Geotech, the pioneer private sector company in Sri

Lanka undertaking geo-technical investigations was

founded in 1979 by Dr. A P Jayasinghe and a group

of engineers and architects. Geotech has successfully

conducted soil investigations for many major

infrastructure projects in Sri Lanka as well as in the

Maldives. A list of landmark projects is included in this

document.

The company has over the years introduced new,

more accurate testing methods, ensuring high

accuracy in the geotechnical data provided to clients.

We are proud to be the pioneers to introduce state

of the art electronic technologies of testing concrete

piles in Sri Lanka.

Geotech employs experienced and competent

technical staff who are skilled in the handling of

modern equipment. They are ably assisted by a skilled

labour force.

UsGeotech (Pvt)Ltd is the principal company of the

group with Geotech Testing Services (Pvt) Ltd. and

Group Engineering Laboratories (Pvt) Ltd. as other

members of the group. Geotech conducts on shore

and off shore borehole investigations and field in-situ

tests such as Mackintosh Probe tests, Plate Load Tests,

Resistivity, Pull Out tests and Cone Penetration Tests

CPTU and DCPT.

Geotech Testing Services offers electronic pile

testing services such as Pile Integrity Testing (PIT), Pile

Dynamic Analyzer (PDA) tests, Sonic Logging tests and

Bidirectional Tests.

Group Engineering Laboratories is a laboratory

services provider for geo-technical investigations and

materials testing for construction industry and operates

a fully equipped laboratory for these services. A brief

description of the tests mentioned are given elsewhere

in this document.

Directors Geoechnical Consultants

Technical Officers

Eng. L P JayasingheBSc, Mi MechE, E Eng, FIE (SL), P EngManaging Director

Prof. B L TennakoonBSc, PhD, C Eng, FIE (SL)Chief Technical Consultant

Prof S.A.S. KulathilakeBSc, PhD, CEng, MIE (SL)Technical Consultant

W.G.M. AbeysekaraS.A. Mech, Dip. Geology, MGA University of MoratuwaGeneral Manager, Geotech Group Geologist with more than 30 years experience

A.D.M.D. AmaratungeSenior Technical Officer cum Purchasing Manager,

P.A. Eranda ChanakaCertificate Course of Geotechnical Engineering, NCT (Civil)Head of Geotech Testing Services (Pvt) Ltd.

D.K.P. WijesekaraDip Geology University of Moratuwa, SLTS – CL – 1 Technical Manager, Geologist with more than 35 years experience

K.V.S.D JayamaliBSc, M.Eng in Foundation Engineering & Earth Retaining Systems, AMIE (SL)Geotechnical Engineer,

Mayanthie JayasingheBScDirector

ServicesBORE HOLE INVESTIGATIONSThe detailed investigation of the sub surface conditions is best

carried out by advancing bore holes in selected locations in

the project site. GEOTECH has the facilities to perform such

drilling work in the overburden and in the bedrock. Extensive

sampling of the soil, on site field tests and monitoring and

observation of the sub surface conditions during drilling adds

to the information that can be provided to the structural

engineer for his designs. Such drilling sampling and laboratory

testing of samples are carried out under strict supervision and

in accordance with the standard codes of practice. In general

the specification and recomendations of BS 1377 are adopted,

while other local and international standards are used as

required by specific projects GEOTECH has the experience and

facilities to carry out both on shore and off shore drilling work,

MACKINTOSH PROBE TESTA simple and economic testing method, to gather preliminary

data on sub surface conditions. Such data may be adequate

for the designs of foundations for lightly loaded structures, as

this provides a very economical method of determining the

thickness of soft deposits such as peat.

Geotech(Pvt) Ltd.

Our TeamBore Hole Investigations TestAbove Right Soil Investigation at KerawalapitiyaBelow Colombo Port Expantion Project

surface variation of the flow of current. The information

gathered is of value in prospecting for ground water,

assessing the quality of rock/soil masses, map the interface

between saline and fresh water and similar applications.

PLATE LOADING TESTPlate loading tests are carried out to determine the

bearing capacity of soils. This test is covered by C P

2001:1957, ASTM D 1194-72 and BS 5930:1981.

PULL OUT TESTPile foundations of telecommunication towers, power

transmission line towers and structural elements such as

soil nails or rock anchors which are sometimes used to

stabilize a potentially dangerous soil or rock slope have to

be able to resist tensile forces.

These foundations use the friction developed between

the foundation (or structural element) and the soil/rock

overburden in contact with it as part of the resisting

force. Designs are carried out based on various theoretical

models assuming friction parameters for the soil/rock

overburden to estimate a safe carrying capacity for such

piles or anchors.

Pull out tests are required when it is necessary to confirm

the validity of the design and ensure the safety of the

structure supported by such foundations or structural

elements.

The testing of piles is done as per ASTM Standard D 3689-

90.

The objective of the test is to obtain the required design

parameters using the results of the ‘Load-Displacement’

measurements for both Loading and Unloading Cycles.

THE CONE PENETRATION OR

CONEPENETROMETER TESTThe Cone Penetrometer is a versatile device for in situ soil

testing. Without disturbing the ground, it provides

information about soil type, geotechnical parameters

like shear strength, density, elastic modulus, rates of

consolidation. It is also called the “Dutch Cone Test”. Today,

the CPT is one of the most used and accepted in soil

methods for soil investigation worldwide.

The test method consists of pushing an instrumented

cone, with the tip facing down, into the ground at a

controlled rate. Most modern electronic CPT cones now

also employ a pressure transducer with a filter to gather

pore water pressure data.CPT testing which also gathers

this piezometer data is called CPTU testing.

GROUND WATER TESTING & SURFACE WATER QUALITY TESTINGThe facilities available with GEOTECH for drilling work is

also used to provide specialist services in water supply

projects. In addition to the testing of water quality in bore

holes, special investigations are carried out to monitor

ground water and surface water quality. Several such

investigations have been carried out in Monaragala and

Hambantota districts and in the Republic of Maldives.

RESISTIVITY TESTThe electrical resistivity of soils are required for certain

projects, where the geophysical characteristics are

important ex. power plant projects. The test is conducted

using electrodes driven into the ground to measure the

Cone Penetration (CPTU) TestAbove Southern Highway Project

Plate Loading TestAbove Hambantota Harbour Project

Pull Out TestBelow Horana Unilever Project

CROSSHOLE SONIC LOGGING (CSL)Crosshole Sonic Logging (CSL) is a method to verify the

structural integrity of drilled shafts and other concrete

piles. This test is covered by ASTM D 6760-14

The CSL method provides more detailed results than

Pile Integrity Tests (PIT) testing in the determination of

structural soundness of concrete within the drilled shaft

inside of the rebar cage. This method provides little

indication of concrete soundness outside the cage.

CSL requires steel (preferred) or PVC access tubes installed

in the drilled shaft and tied to the rebar cage.

The tubes are filled with water as an intermediate medium.

After the concrete cures for 3-7 days, a sound source

(emitter) and receiver are lowered to the bottom of a

pair of access tubes and then raised at a constant speed,

maintaining a consistent elevation between emitter and

receiver. A signal generator generates a sonic pulse from

the emitter which is recorded by the receiver. Relative

energy, waveform and First Arrival Time (FAT) time are

recorded, and logged. This procedure is repeated for all the

tube pairs (profiles) in the pile. The data from each profile is

processed and then plotted.

GEOTECH TESTING SERVICES (PVT.) LTD. having

pioneered the introduction of electronic pile testing

technology for the construction industry in Sri Lanka

has subsequently introduced the following state of the

art electronic technologies of testing the soundness of

driven concrete piles. Also indicated are the sites where

the test was introduced

Bi- directional Test - KRRISH Square Development Project (2013)

Crosshole Sonic Logging (CSL) – Southern Highway Project (2006)

Pile Dynamic Analyzer (PDA) – President’s Palace Project (2001)

Pile Integrity Test (PIT) – Ceylinco Seylan Tower Project (1996)

PILE INTEGRITY TEST (PIT)A simple and economic test carried out on concrete piles

to determine the integrity of piles and the presence of

any cracks, voids, discontinuities and other similar defects.

An invaluable method to select the representative piles

to perform the load tests. The cost effectiveness of the

test enables the testing of all the piles in projects with

hundreds of piles.

This test is covered under the ASTM D 5882-07(2013)

Australian standard AS 2159-1995, French standard NFP

94-106-2, among others.

Geotech Testing Services (Pvt.) Ltd.

PILE DYNAMIC ANALYZER TEST (PDA)A more complex and advanced testing technique for

determining the load carrying capacity of both bored and

driven piles, is carried out using the Pile Dynamic Analyzer.

This state of the art electric pile testing technique using

the highly sensitive method of monitoring pile response

to an imposed dynamic load, by strain transducers and

accelerometers, provides the input data for computer

analysis to determine the load carrying capacity of the pile.

This response is captured and stored as digital data, and

is analyzed using proprietary CAPWAP analysis to provide

highly reliable information on the load carrying capacity of

the pile both by shaft friction and end bearing. The test is

covered by ASTM D 4945-12

Comparison of the graphs from various profiles provides

information on the structural soundness of the concrete

throughout the pile.

A more advanced, higher-end analysis that creates a mock

3-dimensional graphical display of the concrete soundness

throughout the pile is known as Crosshole Sonic

Tomography. This enables better definition and location of

zones of doubtful integrity within the pile.

Crosshole Sonic Logging (CSL) TestAbove Hambantota Port Development ProjectBelow Left South Container Termnal -Colombo HarbourBelow Right CSL Test at Arugam Bay Bridge Project

Pile Integrity Test (PIT) TestAbove Mullative Project

Pile Dynamic Analyzer (PDA) TestBelow Colombo Lotus Tower Project

BI DIRECTIONAL TEST A comprehensive testing method termed Bi Directional

Load Test originally developed by Prof. Osterberg in USA,

has been developed to gather comprehensive data on the

performance of bored and cast - in - situ concrete piles

under the applied test load. In contrast to the standard

maintained load test using top loading against a reaction

kentledge system, this method provides a plethora of data

not only from the pile toe but from the shaft resistance as

well.

It has the distinct additional advantage of eliminating the

need for large and cumbersome reaction loads, which

would be impossible in some locations. In addition the

instrumentation of the pile can contribute even more data

on the behavior of different segments of the pile shaft/soil

interface.

Geotech Testing Services (Pvt) Ltd is proud to have intro-

duced this system of testing which is covered by ASTM D

114 3D - 2007 for the first time in Sri Lanka with a test load

of up to 5000 tons.

Laboratory tests on construction materials provide the

technical information on the quality of a product. The data

is used by structural engineers and architects to design

structures best suited for the terrain.

Group Engineering Laboratories (Pvt) Ltd is a fully

equipped soil laboratory offering a wide range of

Chemical, Mechanical and Physical tests on samples of Soil,

Rock, Aggregate, Concrete and Water under laboratory

conditions, as well as field tests. Additionally, individual

analytical schemes for specific requirements are arranged

on request.

Competent and qualified technical personnel ensure that

testing procedures conform to international standards to

provide reliable technical information required on your

construction project.

12. UU Tri Axial Compression Test

13. Unconfined Compression Test

14. Consolidation Test

15. Specific Gravity & water absorption of aggregate

16. Flakiness Index & Elongation Index

17. Aggregate Crushing Value (ACV)

18. 10% fines Value of Aggregates

19. Aggregate Impact Value (AIV)

20. Los Angeles Abrasion Value (LAAV)

21. Soundness of aggregates by using Na2SO4 / MgSO4

22. Unconfined Compression Test of Rocks

23. Point Load Strength Index of Rocks

24. Field Density Test

25. Field CBR Test

26. Non Destructive Hammer Test on Concrete

27. Compressive Strength Test on Concrete Cubes/

Paving Blocks/Solid Blocks/ Hollow Blocks

28. Compressive Strength Test of Clay Bricks

29. Concrete Mix Design

Group Engineering Laboratories (Pvt) Ltd

1. Sieve & Hydrometer Analysis

2. Moisture Content Determination

3. Atterberg Limits (LL, PL, PL, SL)

4. Specific Gravity

5. Bulk Density /Unit Weight

6. Swell Index Test

7. Proctor Compaction

8. 4 days soaked CBR

9. Permeability Test (Constant Head / Falling Head)

10. pH value, content and Cl- content of soil/

ground water

11. Organic content of soil

Bi Directional TestAbove, Below Krrish Towers Development (96 storied) Project at Colombo 01

3. Soil investigations for the fishery harbours at Kirinda, Kuda wella,

Panadura and Dikovita

4. Soil investigations for the harbor project, Fuamuluku Island,

Maldives

5. Soil investigations for the University of Ruhuna

6. Soil investigations for Asiri Surgical Hospital, Kirimandala Mawatha

7. Soil investigations for the Voice of America Transmission Station,

Iranawila

8. Geotechnical Investigation for Proposed Bandaranayake

International Air Port Development Project Stage - 2 Phase ll

(Nippon Koei Co. Ltd.)

9. Geotechnical Investigation for Extension of Southern Highway

Godagama to Andarawewa (Section III)

(Road Development Authority)

10. Additional Soil Investigation for Proposed Mattala Rajapaksha

International Air Port Development Project, Mattala

(China Harbour Engineering Co. Ltd.)

11. Geotechnical Investigation at Colombo Port expansion Project

East Container Terminal (Hyundai Engineering)

12. Geotechnical Investigation for Colombo Port Expansion Project –

South Container Terminal

(China Harbour Engineering Co. Ltd.)

13. Geotechnical Investigation in Turning Basin Berthing Pocket in

proposed phase 11 of Hambantota Port Development Project

(China Harbour Engineering Co. Ltd.)

14. Geotechnical Investigation along Extension of Southern Highway

Godagama to Beliatta (Road Development Authority)

15. Geotechnical Investigation for the Northern Expressway

Feasibility Study Kurunegala and Melsiripura (Ocyana (Pvt) Ltd.)

16. PDA Test for the Colombo Katunayake Expressway Project

(China Metallurgical Group)

17. Bore Hole Investigation in Bridge Across Kokilai Bridge Lagoon on

Mullative – Kokilai Road (Road Development Authority)

Geotech has successfully conducted over 4,000

geotechnical investigations to date. The care and

meticulous attention to detail in every aspect of a

project has enabled the Geotech group of companies

to develop a sound rapport with its clientele.

The company is proud to have been able to

provide geotechnical information for many

landmark projects in Sri Lanka and the

Maldives, working with local and foreign

clients. Given below is a selection of landmark

projects for which we are proud to have

provided geotechnical data. A selection of soil

investigation projects, in the categories of

infrastructure, civic and commercial buildings and

laboratory tests completed within the

last two and a half years have also

been included.

Projects18. Geotechnical Investigation for Proposed Grid Substation at

Mahiyanganaya, Badulla, Ukuwela, Balangoda, Seethawaka, Nuwara

Eliya, Valachchanai, Kilinochchi (LTL Projects)

19. PIT, PDA for Wind Power Plants Project (Nawaloka Piling (Pvt) Ltd.)

20. PIT PDA, Cross holeTest for the Colombo South Harbour

Development Project (China Harbour Engineering Co. Ltd.)

21. PIT, PDA for the Matara – Kataragama Railway Extension Project

(China Railway No.05 Engineering Company)

Commercial & Civic Buildings1. Soil investigation for the Parliament building, Maldives

2. Soil investigation for the Mahaweli Reach Hotel, Kandy

3. Soil Investigation for the Light House Hotel, Galle

4. Soil investigations for Pioneer Houses – King’s Court, Queen’s Court

residential apartment buildings

5. Soil investigations for the Ceylinco Seylan Tower Project

6. Geotechnical Investigation for Proposed University of Moratuwa,

Development of Institute of Technology at Diyagama, Homagama

(University of Moratuwa)

7. Soil investigations for the Pinnacle Tower Apartments

8. Geotechnical Investigation for Proposed Lotus Tower at

Colombo-o1 (GIGIS (China) Ltd.)

9. Geotechnical Investigation for Proposed Krrish Towers

Development (96 storied) at Colombo 01 (Krrish Transworks Colombo)

10. PIT , PDA Tests for the Sino Lanka Hotel Projects

(Sino Lanka Thao Li Construction (Pvt) Ltd.)

11. Osterberg Cell, Cross hole Tests for the Krrish Square

Development Project (Krrish Transworks Colombo (Pvt) Ltd.)

12. PIT, PDA Tests for the Lotus Tower Development Project ,

(China National Electronics Import and Export Corporation)

13. Sonic Logging Test for the ALTAIR Residence Development Project

(San Piling (Pvt.) Ltd.)

Mahaweli Development Project1. Seismic survey at the Kotmale Reservoir dam site

2. Alternative dam site for Kotmale hydropower project

3. Soil investigations for the Maduru Oya river diversion

Petroleum & Energy Sector1. Soil investigation for the Tank Farm, Sapugaskanda

2. Soil Investigation for offshore mooring bay under sea pipeline for

Shell Gas, Kerawalapitiya

3. Soil investigations for the Combined Cycle Power Plant at the

Kelanitissa Power Station

4. Soil investigations for high tension power line towers

from Galle to Matara

5. Soil investigations for the AES Power Plant at the

Kelanitissa Power Station

Infrastructure 1. Soil Investigation for the Southern

Highway Project

2. Soil investigations and Pile Testing,

Base Line Road Prioject

14. PDA Test for the Defence Ministry Development Project

(Walkers Piling (Pvt) Ltd.)

15. PIT Test for the Waterfront Integrated Resort Project,

(Nawaloka Piling (Pvt) Ltd.)

Water Quality 1. Water Quality Investigations done for JAICA in Moneragala &

Hambantota Districts

2. Water Quality testing at Kelani River for Kelanitissa Power Station

3. Water Quality and geotechnical investigations for Regional

Development Project in the Maldives

Laboratory Tests1. Laboratory tests for Lotus TV Tower Project

(CSGIS China Company Ltd.)

2. Laboratory tests for Colombo Port Expansion Project –South and

East Container terminal (CSGIS China Company Ltd.)

3. Laboratory tests for Construction of Wimalasurendra Power Station

(Ceylon Electricity Board)

4. Laboratory tests for Proposed John Keells City Project

(M/S John Keells Holdings PLC)

5. Laboratory tests for Havelock City Development Project

(Geotech (Pvt) Ltd.)

6. Laboratory tests for Shangri-La Hotel Project (Geotech (Pvt) Ltd.)

7. Laboratory tests for Hambantota Seaport to Airport Development

Project (Geo Engineering Consultants (Pvt) Ltd.)

8. Laboratory tests for Rhino Factory site –Ekala (Nuwani Construction

(Pvt) Ltd.)

9. Laboratory tests for Hambantota port development project

(Geotech (Pvt) Ltd.)

10. Laboratory tests for Hambantota Airport project

(Geotech (Pvt) Ltd.)

11. Colombo outer circular Highway project (Geo Engineering

Consultants)

12. Unilever Factory site, Horana (Nawaloka Construction (Pvt) Ltd.)

13. Laboratory testing for the Extension of Southern Highway

Development Project at Section I from 0.00 km to 3.00 km, Phase I

from Matara to Beliatta and Alternative Trace Section- III from 8+700

to 10+700 km (Road Development Authority)

14. Laboratory testing for the Northern Expressway Feasibility Study

Contract-D, Stage-4A (Kurunegala to Melsiripura) (Ocyana Consultants)

15. Laboratory testing for the Proposed Port Development Project ,

Hambantota (Phase II) (China Harbour Engineering Company Ltd.)

16. Clear Water Transmission Main, Jaffna

(National Water Supply & Drainage Board)

17. Laboratory testing for the Geotechnical Investigation for

Extension of Southern Highway Godagama to Andarawewa (Section

111) (Road Development Authority)

18. Laboratory testing for the Mattala Rajapaksa International

Airport Development Project - Maintenance Repair and Overhauling

(MRO) and Upgrading of Aerodrome Facilities at Mattala Rajapaksa

International Airport (Geotech (Pvt) Ltd.)

19. UDA Housing Project at Henamulla (Access Engineering Ltd.)

20. Proposed Havelock city Apartment Complex at Havelock Road,

Colombo 5 (Geotech (Pvt) Ltd.)

21. Proposed Crown Colombo Development at D.R. Wijewardena

Mawatha Colombo 1 (Geotech (Pvt) Ltd.)

22. Proposed Krrish Transworks building at York Street, Colombo 2

(Krrish Transworks Colombo (Pvt) Ltd.)

23. Colombo City Centre Development (Geotech (Pvt) Ltd.)

Access Engineering. Ltd.

Ceylon Electricity Board

China Harbour Engineering Co. LTD.

Central Engineering Consultancy Bureau (CECB)

Colombo Survey Consultants (Pvt) Ltd.

China Metallurgical Group Corporation

China National Electronics Import and Export Corporation

China Railway No.05 Engineering Company

CSIGIS (China) Limited

Geo Engineering Technology (Pvt) Ltd.

Hemas Logistics (Pvt) Ltd.

Hyundai Engineering

John Keells Holdings PLC

Krrish Transworks Colombo

LTL Projects

National Water Supply & Drainage Board

Nawaloka Piling PLC

Nippon Koei Co. Ltd

Nuwani Construction (Pvt) Ltd.

Ocyana (Pvt) Ltd.

Port Authority , Sri Lanka

Road Development Authority

Sino Lanka Thao Li Construction (Pvt) Limited

State Engineering Corporation

Squiremech Engineeing (Pvt) Ltd

San Piling (Pvt) Limited

Sri Lanka Ports Authority

Tudawe Brothers (pvt) Ltd

University of Moratuwa

Walkers Piling (Pvt) limited

Clients

13/1, Pepiliyana Mawatha, Kohuwala, Nugegoda, Sri Lanka

Tel +94 112 813805, +94 0714 735 745 Fax +94 112 823 881

E -mail geotechlanka@gmail.com

www.geotechlanka.com