Highway Slope Manual

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41 specifically identified and taken into account in the design of the remedial works. The designer should decide on the minimum factors of safety to be adopted for the remedial works design (i.e. to consider whether to design in accordance with Table 4.4 or 4.5), taking into account the findings of the failure investigation and the degree of uncertainties involved. Legend: A B C D E Princess Margaret Road (from Wylie Road to Pui Ching Road) Pokfulam Road (from Pokfield Road to Mount Davies Road) Castle Peak Road (from Sham Tseng to Siu Lam) Borrett Road Shouson Hill Road West Notes: (1) The above nomograph corresponds to a reference landslide (i.e. 50 m 3 in volume) directly affecting roads with different vehicular traffic densities (see Wong et al (1997b) for details). (2) Information on actual AADT is given in the Annual Traffic Census and Statistics published by the Transport Department. Design AADT values are given in the Transport Planning and Design Manual (Transport Department, 1984). (3) The design AADT, the expected AADT or the actual AADT, whichever is the highest, should be considered. The AADT used should be documented in the Maintenance Manual to facilitate review in future Engineer Inspections for Maintenance (GEO, 1998a). (4) A to E are examples based on 1999 traffic census data (Transport Department, 2000). Figure 4.1 Relationship between Roads with Different Traffic Density, AADT and Number of Road Lanes
42 Notes: (1) This Figure is based on Wong et al (1997b) and GEO internal data. failure mechanisms is given by Wong et al (1998a). Discussion on different slope (2) The mobility of landslide debris is dependent on the mechanism and volume of failure (Wong & Ho, 1996). (3) The travel angle for typical rain-induced landslides involving small to medium-scale failure (viz. landslide volume < 2 000 m3) generally ranges from 30° to 40°, but it could be lower for unfavourable site settings. (4) For landslides involving static liquefaction of loose fill or wash-out action, the travel angle reduces to 15° to 30°. (5) The high mobility of the four cut slope failures highlighted, viz. at Castle Peak Road (Halcrow, 1999a), Ching Cheung Road (Halcrow, 1998), Hong Tsuen Road (Halcrow, 1999c) and Lai Ping Road (Sun & Campbell, 1999), is related to the specific site settings. Figure 4.2 Data on Debris Mobility for Different Mechanism and Scale of Landslides Involving Cut and Fill Slopes in Hong Kong
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 and 28: 26 of the geotechnical hazards and
Page 29 and 30: 28 Table 2.2 Geotechnical Haards Th
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
Page 39 and 40: 38 movement monitoring and control
Page 41: 40 landslide debris, and the nature
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
Page 69 and 70: 68 Results of Rockfall Protective B
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.
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92 [BLANK PAGE]
Page 95 and 96:
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
Page 107 and 108:
106 [BLANK PAGE]
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108 Wong, C.K.L. (1998). The New Pr
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110 of slopes and slope owners and
Page 113 and 114:
112 [BLANK PAGE]
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114 (iv)subsidence of ground or roa
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