Highway Slope Manual

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-A3 (vi) new slope features to be formed. (e) A Natural Terrain Hazard Assessment (NTHA) Report where a NTHA has been carried out. The NTHA Report shall detail the work carried out, and the findings and recommendations of the NTHA as stated in C.2(f) above. The Report shall contain all necessary photographs, tables, figures and drawings, including cross sections, to adequately illustrate the reasoning given in the text of the Report. 1n particular, the Report shall contain the following key drawings: (i) (ii) cross sections showing possible debris travel paths from the identified potential landslide source locations and boulder/rock fall locations along the route, Landslide and Boulder/Rockfall Hazard Maps at a scale of -:- AAA showing: • principal drainage courses, and all catchments and subcatchments affecting the route, • likely landslide sources, • likely boulder/rock fall locations, • debris flow paths from landslide sources with the likely limits of travel of debris, • boulder/rock fall trajectories with the likely limits of travel of boulder/rock falls. Larger scale drawings (e.g. -:5AA and -:2AA) shall be provided if particular areas of natural terrain require amplification. (f) A Geotechnical Assessment Report documenting the findings and recommendations of the work as stated in C.2(g) to C.2(n) above. The Report shall include plans and cross sections of preliminary design of the geotechnical works and hazard mitigation measures proposed for the project. 1t shall also highlight any matters in relation to the proposed geotechnical works and hazard mitigation measures, and diversion/ducting of services/utilities, that require further investigations or particular attention before or during the detailed design stage. The final Reports and Maps as stated in C.3(a) to C.3(e) above shall become the companion documents of the GA Report. C.. Programme of Implementation (a) The due date for commencement of the GA shall be . (b) A working programme, to be agreed with the Employer, shall be prepared within weeks of the commencement of the GA. (c) The due date for completion of the GA shall be .
-A4 Notes: (-) An example of a programme for the GA of a highway project is given in Figure C-. The actual programme and milestones should dovetail those of the highway project. (2) More than one team of geotechnical engineers and technical personnel may be needed and the programme may have to be adjusted, depending on the size of the study area and the number of alternatives to be considered. C.5 Geotechnical Personnel for the GA The Consultants shall engage professionally qualified persons with an adequate level of experience in geotechnical engineering and/or engineering geology to carry out the work under this Assignment. A professionally qualified person with suitable local experience in geotechnical engineering shall be in charge of the Assignment. A suitable qualification is Registered Professional Engineer (Geotechnical). This person shall scrutinize the relevance, adequacy and quality of all information collected, carry out the site walkover survey and prepare the GA Report personally. C.6 Information to be Provided by the Employer The Consultants shall search for and obtain all relevant published and publicly available information additional to those identified in the Geotechnical Report. All other information held by the Employer and relevant to the GA will be provided to the Consultants free of charge. * * * * * Notes: (-) The items given in Section C.2 of this Model Brief for GA are for guidance only. The project engineer should modify the items of the Brief as appropriate, taking into account the need, scale and complexity of the project. (2) For Government highway projects, the guidelines given in the Project Administration Handbook Volume 11 Chapter 4 (Government of Hong Kong, -992) should be followed in the preparation of the preliminary design of the geotechnical works and hazard mitigation measures as stated in C.2(j)(i) above. The preliminary design may be based on assumed parameters and information collected in the desk study and site reconnaissance, with appropriate sensitivity analyses carried out.
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HIGHWAY SLOPE MANUAL GEOTECHNICAL E
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2 。 The Government of the Hong Ko
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4 STEERING COMMITTEE: Geotechnical
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6 Page No. 3. SITE INVESTIGATION 33
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8 Page No. APPENDICES APPENDIX A -
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10 LIST OF FIGURES Figure No. Page
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12 LIST OF LATES Plate No. Page No.
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14 [BLANK PAGE]
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16 year (Evans et al, 1998), they h
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18 Plate 1.4 Landslide at Ching Che
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20 Plate 1.8 Steep Natural Terrain
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22 [BLANK PAGE]
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24 Notes: (1) The projects in the P
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26 of the geotechnical hazards and
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28 Table 2.2 Geotechnical Haards Th
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30 for carrying out a GA is given i
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32 [BLANK PAGE]
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34 Table 3.1 Potential Uses of Diff
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36 or features such as dykes or fra
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38 movement monitoring and control
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40 landslide debris, and the nature
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42 Notes: (1) This Figure is based
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44 Table 4.5 Recommended Minimum Fa
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46 [BLANK PAGE]
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48 Plate 5.1 Surface Runoff Channel
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50 Cascades, with cover where neces
Page 53 and 54: 52 (a) Trash Grill at Inlet of Cros
Page 55 and 56: 54 5.2.3 Drainage Improvement Works
Page 57 and 58: 56 For the control of visual impact
Page 59 and 60: 58 Plate 6.3 Pattern and Texture Pl
Page 61 and 62: 60 ighways are environments with a
Page 63 and 64: 62 Filling operations for a highway
Page 65 and 66: 64 Blasting is the most common meth
Page 67 and 68: 66 Notes: (1) The responsibility fo
Page 69 and 70: 68 Results of Rockfall Protective B
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Page 73 and 74: 72 overseeing the maintenance of th
Page 75 and 76: 74 In addition to the slope upgradi
Page 77 and 78: 76 after each heavy rainstorm event
Page 79 and 80: 78 d n n d d d d d d d
Page 81 and 82: 80 event of a landslide should be b
Page 85 and 86: 84 Federal Highway Administration (
Page 87 and 88: 86 Highways Department (1996). Mana
Page 89 and 90: 88 Wong, H.N., Pang, L.S., Wong, A.
Page 95 and 96: 94 key natural terrain and man-made
Page 97 and 98: 96 and details of all existing slop
Page 101 and 102: -AA (v) relevant services and utili
Page 103: -A2 (m) (n) 1dentify any statutory
Page 109 and 110: 108 Wong, C.K.L. (1998). The New Pr
Page 111 and 112: 110 of slopes and slope owners and
Page 115: 114 (iv)subsidence of ground or roa
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