Highway Slope Manual

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27 Notes: (1) Possible route corridors, different route alignments and the project study boundaries should be jointly developed by a multi-disciplinary team of professionals including a geotechnical engineer. This should take into account all constraints (see Note (3) below) known to the team at this stage. (2) A recommendation should be made by the geotechnical engineer to the multi-disciplinary team of professionals. (3) This should be examined by the multi-disciplinary team of professionals. Other factors to be reviewed include public needs, transportation requirements, availability and resumption of land, town planning requirements, highway and structural engineering requirements, environmental (including landscape, visual and ecological), drainage and traffic impacts, etc. Consideration should be given to the costs of any land resumption required for the preferred corridor/alignment. (4) Consideration should be given to the uncertainties of the vertical route alignment. (5) The capital cost estimates should allow for planning and supervision of ground investigation, stability assessment and design of upgrading works for existing slopes, and design and supervision of construction of the geotechnical works and hazard mitigation measures by geotechnical engineers. The uncertainties in land-take, cost and time required should also be estimated, as input to the financial and programming risk analyses for the project. Figure 2.2 Geotechnical Activities in a Geotechnical Review
28 Table 2.2 Geotechnical Haards That Need to be Considered for a <strong>Highway</strong> Project Existing man-made slope All substandard features the failure of which could affect the route or could be features that could affect or caused by the works. All features which are up to standard but could be be affected by the project affected by the works (e.g. due to installation of buried water-carrying services, changes in surface and subsurface water flow regime and lateral loads that will be imposed by new highway structures). an-made slope features that will be formed along the route Natural terrain landslide hazards Other geotechnical hazards Hazards associated with the geotechnical works All cut slopes, fill slopes and retaining walls, with particular attention drawn to those to be formed in difficult ground, e.g. steep hillside, adverse geological conditions such as presence of dykes, faults and other weak zones, and adverse surface water or groundwater conditions. All natural terrain landslide hazards, including debris avalanches, debris slides, channelised/non-channelised debris flows, boulder/rock falls, gully and other forms of erosion and deep-seated ground movements (see Figure 2.3), which could affect the route or could be caused by the works. Guidance on natural terrain hazard review and natural terrain hazard assessment is given by Ng et al (2000). All other hazards, in cluding the presence of soft ground and karstic areas. All hazards associated with construction of the geotechnical works, e.g. rock blasting near sensitive receivers, open or supported excavations including those for cut and cover tunnel construction and temporary diversion of surface water, traffic diversion and/or road closure to mitigate the hazards during construction. Figure 2. Natural Terrain Landslide Haards Posed to a <strong>Highway</strong>
Page 1 and 2: HIGHWAY SLOPE MANUAL GEOTECHNICAL E
Page 3 and 4: 2 。 The Government of the Hong Ko
Page 5 and 6: 4 STEERING COMMITTEE: Geotechnical
Page 7 and 8: 6 Page No. 3. SITE INVESTIGATION 33
Page 9 and 10: 8 Page No. APPENDICES APPENDIX A -
Page 11 and 12: 10 LIST OF FIGURES Figure No. Page
Page 13 and 14: 12 LIST OF LATES Plate No. Page No.
Page 15 and 16: 14 [BLANK PAGE]
Page 17 and 18: 16 year (Evans et al, 1998), they h
Page 19 and 20: 18 Plate 1.4 Landslide at Ching Che
Page 21 and 22: 20 Plate 1.8 Steep Natural Terrain
Page 25 and 26: 24 Notes: (1) The projects in the P
Page 27: 26 of the geotechnical hazards and
Page 31 and 32: 30 for carrying out a GA is given i
Page 35 and 36: 34 Table 3.1 Potential Uses of Diff
Page 37 and 38: 36 or features such as dykes or fra
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Page 41 and 42: 40 landslide debris, and the nature
Page 43 and 44: 42 Notes: (1) This Figure is based
Page 45 and 46: 44 Table 4.5 Recommended Minimum Fa
Page 49 and 50: 48 Plate 5.1 Surface Runoff Channel
Page 51 and 52: 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
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Page 73 and 74: 72 overseeing the maintenance of th
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78 d n n d d d d d d d
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80 event of a landslide should be b
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84 Federal Highway Administration (
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86 Highways Department (1996). Mana
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88 Wong, H.N., Pang, L.S., Wong, A.
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90 [BLANK PAGE]
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92 [BLANK PAGE]
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94 key natural terrain and man-made
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96 and details of all existing slop
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98 [BLANK PAGE]
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-AA (v) relevant services and utili
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-A2 (m) (n) 1dentify any statutory
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-A4 Notes: (-) An example of a prog
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108 Wong, C.K.L. (1998). The New Pr
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110 of slopes and slope owners and
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114 (iv)subsidence of ground or roa
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