REPORT - EQC Earthquake Commission...Darfield Earthquake Recovery Geotechnical Factual Report Parklands T&T Ref. REP-PRK-FAC Earthquake Commission February 2011 Table of contents 1

Darfield Earthquake Recovery Geotechnical Factual Report Parklands T&T Ref. REP-PRK-FAC

Earthquake Commission February 2011

REPORT Earthquake Commission

Darfield Earthquake Recovery Geotechnical Factual Report Parklands



REPORT

Report prepared for:

EARTHQUAKE COMMISSION

Report prepared by:

TONKIN & TAYLOR LTD

Distribution:

EARTHQUAKE COMMISSION 3 copies

TONKIN & TAYLOR LTD (FILE) 1 copy

February 2011

T&T Ref: REP-PRK-FAC

Earthquake Commission




Table of contents

1 Introduction 1

2 Project background 1

3 Site description 2 3.1 General 2 3.2 Regional geology 2

4 Geotechnical investigations 2 4.1 General 2 4.2 Cone penetration testing (CPT) 2 4.3 Machine boreholes 3 4.4 Geophysical testing 3

5 Groundwater observations 3

6 Laboratory testing 3

7 Environment Canterbury information 3

8 References 4

Appendix A: Investigation Location Plans

Appendix B: Cone Penetration Testing

Appendix C: Environment Canterbury Boreholes

1



1 Introduction

The Earthquake Commission (EQC) engaged Tonkin & Taylor (T&T) to undertake site investigations around selected suburbs of Canterbury following the Darfield Earthquake sequence that started on 4 September 2010. These site investigations comprise:

a) Cone penetration testing b) Machine boreholes c) Geophysical testing d) Groundwater observations e) Laboratory testing

Site investigation works and factual reporting is being undertaken for a number of suburbs that were affected by liquefaction induced land damage.

The report contains factual data to provide a geotechnical source for council consent applications for the suburb. This report presents all currently available geotechnical and engineering geological investigations that were commissioned by EQC after the 2010 Darfield Earthquake and all readily available data that Environment Canterbury and Christchurch City Council hold for the suburb.

This is a factual report of field investigations. The field investigations have been undertaken at discrete locations and no inferences about the nature and continuity of ground conditions away from the investigations locations are made. No interpretation of investigation results has been made in this report.

2 Project background

The magnitude (M) 7.1 Darfield Earthquake occurred on 4 September 2010. The epicentre was close to the town of Darfield, approximately 40 km west of Christchurch. The earthquake caused extensive ground liquefaction, in localised areas of Canterbury. The liquefaction resulted in major ground settlement, lateral spreading and, to a lesser extent, foundation support failure, with consequential building damage.

T&T carried out a broad geotechnical land damage assessment and mapping of the main urban areas in the Canterbury region that have been significantly affected by strong ground motion arising from the earthquake. The results of that assessment are presented in the T&T Stage 1 report (Ref 1) dated October 2010 and released to the general public by EQC. The Stage 1 report presented the land damage categorisation, mapping methodology, information and results generated to 1 October 2010. Land remediation concepts and generalised land remediation options were also presented.

The T&T Stage 2 report (Ref 2) dated November 2010 and released to the general public by EQC is based on a detailed suburb-by-suburb engineering assessment into the nature and extent of land damage. It also identifies land repair strategies for each suburb and areas most affected by land damage. The report presents 22,500 mapped properties as at 5 November 2010 in Canterbury and separates them into three recovery zones; A, B and C. These recovery zones relate to the extent of land repair required and allow for a coordinated recovery plan.

2



3 Site description

3.1 General

Parklands is a suburb on the northeast side of Christchurch and is located approximately 7 km from the Christchurch CBD (Drawing LOC-PRK-01, Appendix A) and within Christchurch City Council jurisdiction. The subject area is bounded to the south by the Marshlands swamp/wetlands.

The area is low lying and topographically is typically flat.

3.2 Regional geology

The Geology of the Christchurch Urban Area (Ref 3) shows the site to be underlain by fixed and semi-fixed sand dunes and beach deposits with a section in the south west of the subject area underlain by sand, silt, and some peat of drained lagoons and estuaries. Both deposits are classified as being of Holocene age.

4 Geotechnical investigations

4.1 General

The geotechnical investigations commissioned by EQC from September 2010 were determined and located under direction from T&T. The locations were selected taking into account access for the site investigation plant, the presence of services and any traffic management requirements. The current investigations comprise 9 cone penetration tests (CPTs).

The location of the site investigations is shown on Drawing GIP-PRK-01 (Appendix A) and the above investigation technique is discussed below.

4.2 Cone penetration testing (CPT)

Five companies were commissioned to provide CPT probing services on this project and information on the CPT rig capability is summarised briefly below. The output of each CPT rig varies and therefore the testing data has been produced on a standard T&T template. The company which carried out each CPT test is identified on the CPT log. The companies that carried out the testing were:

a) Opus International Consultants Ltd (Opus) - 18T truck-mounted rig b) Perry Drilling Ltd (Perry) - 20T rubber tracked truck-mounted rig c) McMillan Drilling Services (McMillan) - 14T truck-mounted rig d) Geotech Drilling (Geotech) - 16T truck-mounted rig e) Ground Investigations Ltd (GI) - self-augering Pagani CPT rig. The rig augers reaction

anchors into place in the ground in order to drive a standard CPTu cone with up to 20T of force.

Selected CPT probes had down-hole seismic shear wave velocity testing carried out. These are identified on each CPT log and summarised in Table 4-1 below.

Each CPT probe location was pre-dug by hand to between 800 mm and 1200 mm to mitigate the risk of unforeseen underground services being present at the selected investigation locations.

The results of the CPT probing are presented in Appendix B.

3



The CPT testing undertaken is summarised in Table 4-1.

Table 4-1 Cone penetration testing summary

CPT ID Maximum depth (m)

Location (mE)

Location (mN)

Ground Surface R.L

Comments

CPT-PRK-01 7.46 2485364.65 5747833.50 3.65 Pilot CPT

CPT-PRK-02 10.38 2485391.37 5747560.96 3.35 Pilot CPT

CPT-PRK-03 8.38 2485124.96 5747475.38 3.00 Pilot CPT

CPT-PRK-04 21.14 2485170.81 5747662.67 3.72 Seismic CPT

CPT-PRK-05 24.28 2485595.91 5747678.81 4.18

CPT-PRK-06 35.48 2485750.12 5747713.96 4.17


CPT-PRK-08 34.14 2485503.42 5747221.72 3.06

CPT-PRK-09 33.86 2485267.76 5747374.61 3.69

4.3 Machine boreholes

No machine boreholes have been carried out in the suburb of Parklands.

4.4 Geophysical testing

No geophysical testing has been carried out in the suburb of Parklands.

5 Groundwater observations

In Parklands, during the investigations, groundwater depths ranged from 1.8 m to 0.6 m below existing ground level. These identified levels were based on dynamic pore water pressure results in CPT testing and field observations of waterways (rivers and streams).

6 Laboratory testing

No laboratory testing has been carried out for the subject area.

7 Environment Canterbury information

Additional borehole data, which is held by Environment Canterbury for the subject area, has been included in Appendix C. This data has been reproduced with the permission of Environment Canterbury and forms part of previous investigations undertaken by a variety of geotechnical consultants. Records for boreholes outside of the area covered by this report may be obtained from Environment Canterbury.

4



8 References

1. Tonkin & Taylor Ltd (October 2010), prepared for the Earthquake Commission Darfield Earthquake 4 September 2010 Geotechnical Land Damage Assessment & Reinstatement Report STAGE 1 REPORT.

2. Tonkin & Taylor Ltd (November 2010), prepared for the Earthquake Commission Darfield Earthquake 4 September 2010 Geotechnical Land Damage Assessment & Reinstatement Report STAGE 2 REPORT.

3. Brown, L.J.; Weeber, J.H. (1992), Geology of the Christchurch urban area. Institute of Geological & Nuclear Sciences 1:25,000 geological map 1. 1 sheet + 104p. Lower Hutt, New Zealand, Institute of Geological and Nuclear Sciences Limited.

5




Darfield Earthquake Recovery Geotechnical Factual Report Parklands Appendix A: Investigation Location Plans


Appendix A: Investigation Location Plans T&T Ref. REP-PRK-FAC


REPORT



Report prepared by:

TONKIN & TAYLOR LTD

Distribution:



February 2011



Darfield Earthquake Recovery Geotechnical Factual Report Parklands Appendix A: Investigation Location Plans




Appendix A: Investigation Location Plans

PARKLANDS

Environmental and Engineering Consultants

Tonkin & TaylorLevel 6, 151 Kilmore St, Christchurch

Tel. (03) 363-2440 Fax. (03) 363-2441www.tonkin.co.nz

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Environmental and Engineering ConsultantsTonkin & Taylor

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Darfield Earthquake Recovery Geotechnical Factual Report ParklandsParklands


Earthquake Commission January 2011


Darfield Earthquake Recovery Geotechnical Factual Report Parklands Appendix B: Cone Penetration Testing


Appendix B: Cone Penetration Testing T&T Ref. REP-PRK-FAC


REPORT



Report prepared by:

TONKIN & TAYLOR LTD

Distribution:



February 2011



Darfield Earthquake Recovery Geotechnical Factual Report Parklands Appendix B: Cone Penetration Testing




Appendix B: Cone Penetration Testing

Summary Sheet –Parklands PRK 27

CPT ID Maximum depth (m)

Location (mE)

Location (mN)

Ground Surface R.L

Comments

CPT-PRK-01 7.46 2485364.65 5747833.50 3.65 Pilot CPT

CPT-PRK-02 10.38 2485391.37 5747560.96 3.35 Pilot CPT

CPT-PRK-03 8.38 2485124.96 5747475.38 3.00 Pilot CPT


CPT-PRK-05 24.28 2485595.91 5747678.81 4.18

CPT-PRK-06 35.48 2485750.12 5747713.96 4.17


CPT-PRK-08 34.14 2485503.42 5747221.72 3.06

CPT-PRK-09 33.86 2485267.76 5747374.61 3.69

Project: Darfield 2010 Earthquake - EQC Ground Investigations Page: 1 of 1 CPT-PRK-01 Test Date: 7-Oct-2010 Location: Parklands Operator: Geotech Pre-Drill: 0m Assumed GWL: 1.7mBGL Located By: Survey GPS Position: 2485364.7mE 5747833.5mN 3.648mRL Coord. System: NZMG & MSL Other Tests: Comments:

0

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Sleeve Friction (kPa)

Dep

th( m

)

Cone Resistance (MPa)Cone Sleeve

0 1 2 3 4 5 6

0 1 2 3 4 5 6Friction Ratio (%)

0 100 200 300

0 100 200 300Pore Pressure (kPa)

T+T Ref: 51731.001 Printed: 16/12/2010 4:22 p.m. Template: CPT Graph Template v0.41.xls

Project: Darfield 2010 Earthquake - EQC Ground Investigations Page: 1 of 1 CPT-PRK-02 Test Date: 7-Oct-2010 Location: Parklands Operator: Geotech Pre-Drill: 0m Assumed GWL: 1.5mBGL Located By: Survey GPS Position: 2485391.4mE 5747561mN 3.35mRL Coord. System: NZMG & MSL Other Tests: Comments:

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Project: Darfield 2010 Earthquake - EQC Ground Investigations Page: 1 of 1 CPT-PRK-03 Test Date: 8-Oct-2010 Location: Parklands Operator: Geotech Pre-Drill: 0m Assumed GWL: 1.2mBGL Located By: Survey GPS Position: 2485125mE 5747475.4mN 2.998mRL Coord. System: NZMG & MSL Other Tests: Comments:

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Project: Darfield 2010 Earthquake - EQC Ground Investigations Page: 1 of 2 CPT-PRK-04 Test Date: 6-Dec-2010 Location: Parklands Operator: Perry Pre-Drill: 1.2m Assumed GWL: 1.7mBGL Located By: Survey GPS Position: 2485170.8mE 5747662.7mN 3.724mRL Coord. System: NZMG & MSL Other Tests: Comments:

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Project: Darfield 2010 Earthquake - EQC Ground Investigations Page: 1 of 2 CPT-PRK-05 Test Date: 6-Dec-2010 Location: Parklands Operator: Perry Pre-Drill: 1.2m Assumed GWL: 1mBGL Located By: Survey GPS Position: 2485595.9mE 5747678.8mN 4.183mRL Coord. System: NZMG & MSL Other Tests: Comments:

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Project: Darfield 2010 Earthquake - EQC Ground Investigations Page: 2 of 2 CPT-PRK-05 Test Date: 6-Dec-2010 Location: Parklands Operator: Perry Pre-Drill: 1.2m Assumed GWL: 1mBGL Located By: Survey GPS Position: 2485595.9mE 5747678.8mN 4.183mRL Coord. System: NZMG & MSL Other Tests: Comments:

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Project: Darfield 2010 Earthquake - EQC Ground Investigations Page: 1 of 2 CPT-PRK-06 Test Date: 6-Dec-2010 Location: Parklands Operator: Perry Pre-Drill: 1.2m Assumed GWL: 0.6mBGL Located By: Survey GPS Position: 2485750.1mE 5747714mN 4.167mRL Coord. System: NZMG & MSL Other Tests: Comments:

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th( m

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Project: Darfield 2010 Earthquake - EQC Ground Investigations Page: 2 of 2 CPT-PRK-06 Test Date: 6-Dec-2010 Location: Parklands Operator: Perry Pre-Drill: 1.2m Assumed GWL: 0.6mBGL Located By: Survey GPS Position: 2485750.1mE 5747714mN 4.167mRL Coord. System: NZMG & MSL Other Tests: Comments:

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Appendix C: Environment Canterbury Boreholes T&T Ref: REP-PRK-FAC



Darfield Earthquake Recovery Geotechnical Factual Report Parklands Appendix C: Environment Canterbury Boreholes




REPORT



Report prepared by:

TONKIN & TAYLOR LTD

Distribution:



February 2011



Darfield Earthquake Recovery Geotechnical Factual Report Parklands Appendix C: Environment Canterbury Boreholes




Appendix C: Environment Canterbury Boreholes

Borehole ID Maximum depth (m)

Location (mE) Location (mN) Ground level R.L

M35/1623 40.2 2485800 5747800 4.2

M35/1636 61.29 2485850 5747474 1.8

M35/1168 30.79 2485849 5747474 2.4




Documents

REPORT - EQC Earthquake Commission...Darfield Earthquake Recovery Geotechnical Factual Report Parklands T&T Ref. REP-PRK-FAC Earthquake Commission February 2011 Table of contents 1