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1、Client:Guangdong LNG Terminal and Trunkline Project Joint Executive OfficeProject:Guangdong LNG Terminal and Trunkline Project, ChinaTitle:Preliminary Landslide Risk Assessment of Proposed Pipeline Routes Based on Desk Study and Selected Field VisitsDocument Reference: 5001585/GTG.2001334/Desk Study
2、 and Field Assessment Report (02 Final)02FinalJHCEMLSPPPGFMS13/02/200301Draft for review by:Client,Prof. P.G. Fookes,Mr M. SweeneyJHCEMLSPPDTSDTS20/12/2002Revision/ StatusPurpose/ DescriptionOriginatedCheckedReviewedAuthorisedDateCONTENTSEXECUTIVE SUMMARY11.INTRODUCTION3Background3Subsequent Work on
3、 Landslide Risk4Scope of work5Programme62.REGIONAL SETTING9Geology and Terrain9Climate and Weathering10Key Terrain Issues10Slope Processes10Other issues113.LANDSLIDE HAZARD AND RISK13Introduction13Natural Terrain Landsliding in Hong Kong15Applicability of Hong Kong Landslide Statistics to the Guangd
4、ong Area17Cut Slope Failures in Hong Kong184.LANDSLIDE RISK ASSESSMENT FOR THE PROPOSED PIPELINE ROUTE21Introduction21Natural Terrain Landslides22Overall Risk22Relative Risk within Landslide Prone Lengths of the Route24Man-made Cut Slopes26Introduction26Assessment of the Proposed Pipeline Route26Com
5、bined Natural Terrain and Cut Slopes30Summary31Comparison of Risk with Other Pipelines335.OPTIONS FOR THE MITIGATION OF LANDSLIDE RISK34Introduction34Ridge and Spur Alignments35Engineering the pipeline to isolate it from existing and potential landslide and erosion processes36Management of Spoil36Ma
6、nagement of Surface Water37Summary386.FIELD ASSESSMENT OF VISITED AREAS39Stake Nos. B084 to C007-2 (see Terrain Map No. 11)43Stake Nos. B072-1 to B083 (see Terrain Map No. 12)44Stake Nos. B048 to B055-1 (see Terrain Map No. 13)45Stake Nos. B030-1 to B039 (see Terrain Map No. 13)46Stake Nos. B002 to
7、B012-1 (see terrain Map No. 14)47Stake Nos. A001 to A016 (see Terrain Map No. 14)48Stake Nos. A034-1 to A039-1 (note: no Terrain Map produced for this area)49Stake Nos. 1001 to 1032 (see Terrain Map No. 15)50Stake Nos. 1123 to 1131 (see Terrain Map No. 16)51Stake Nos. 2015 to 3006 (see Terrain Map N
8、o. 17)52Stake Nos. 3031 to 3042 (see Terrain Map No. 18)53Stake Nos. 3060 to 3068 (see Terrain Map No. 18)547.CONCLUDING REMARKS55Landslide Risk55Other Terrain Issues58The Way Forward588.REFERENCES60TABLES (in the text)Table 1Field Visit Programme.Table 2Summary Geology of Guangdong Province.Table 3
9、Risk Assessment Definitions (from Royal Society, 1992; Cruden and Fell 1997).Table 4Rainfall Thresholds for Landslide Activity in Hong Kong (Evans, 1997; Evans et al., 1997).Table 5Width Classes of Relict and Recent Landslides in the Natural Terrain Landslide Inventory for Hong Kong (from Evans et a
10、l., 1997).Table 6Landslides in Hong Kong Recorded by the Geotechnical Engineering Office (from Fell et al., 1996).Table 7Slope Approach Classes (Orientation of the Pipeline Relative to the Slope).Table 8Natural Terrain Risk Assessment: Summary Statistics.Table 9Summary of Natural Terrain Landslide S
11、usceptibility Classes for Selected Hong Kong Bedrocks (adapted from Evans and King, 1997).Table 10Natural Terrain Landslides: Relative Risk Classes.Table 11Natural Terrain Landslides: Summary of the Lengths Associated with each Relative Risk Class.Table 12Example 1, a Fully Engineered and Maintained
12、 Cut Slopes: Assessment of the Probability of Cut Slope Failure (based on Findlay and Fell, 1995).Table 13Example 2, Minimally Engineered Cut Slopes: Assessment of the Probability of Cut Slope Failure (based on Findlay and Fell, 1995).Table 14Landslide Risk Assessment for the August 2002 Pipeline Ro
13、ute: Summary Statistics.APPENDICESAppendix APreliminary Natural Terrain Landslide Risk AssessmentAppendix BPreliminary Cut Slope Landslide Risk AssessmentAppendix CPreliminary Combined Landslide Risk AssessmentAppendix DTechnical Paper: Framework for Assessing the Probability of Sliding of Cut Slope
14、 (from Fell et al., 1996)Appendix ELocation of Waypoints and PhotographsAppendix FSummary of Geology of the Guangdong ProvinceFIGURESFigure 1Regional Context and Key Map of Guangdong ProvinceFigure 2Landslides Ruptures FrequenciesFigure 3aScale of Weathering Grades of Rock MassFigure 3bModels of Wea
15、thering in GraniteFigure 4Typical Shallow Hillside FailureFigure 5Problems Associated with Routing Across Deep Gullys and SpursFigure 6Type of Landslides on Cut SlopesFigure 7Event Tree Illustrating Potential Pipe Rupture Scenarios Associated with Cut Slope FailuresFigure 8Flowchart for Cut Slope Instability Risk AssessmentFigure 9A Summary of the Combined Ri
