Highway Slope Manual

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113 APPENDIX F SITE CHECK LIST FOR LANDSLIDE INSPECTIONS The site check list below may be used as a guide for landslide inspections during emergency, but it is by no means exhaustive. It includes the possible sources of danger and causes of failure which should be noted by the engineer in the course of his inspection. (a)As water is normally the key element in triggering landslides, consider and look for the sources of water that are likely to adversely affect the situation and obtain the related information: (i)rainfall and the time of failure (for correlation with development of rainfall at the nearest raingauge), (ii)flooding and its timing, (iii)concentrated surface water flow, channelised flow or areas of water ponding above the slope or along the road, (iv)sewers and stormwater channels and drains, gullies, catchpits, cross road drains, etc., and their conditions, (v)buried or exposed fresh or salt water pipes along the road and their conditions, (vi)prominent water courses such as nullahs, natural drainage lines, etc., and their conditions, and (vii)diversion of flow due to blockage of natural drainage lines and seepages from slopes. (b)Look for indications of ground movement such as displacement and/or cracking of: (i)paved ground, road kerbs and drainage channels, (ii)slope drainage channels, catchpits, and (iii)trees or other normally vertical features. (c)Look at surface features for signs of distress: (i)tension cracks on the ground surface or road pavement, (ii)bulging of slopes or heave of ground or road, (iii)local depression of paved ground or road,
114 (iv)subsidence of ground or road, (v)excessive water seepage (indicative of high groundwater level or distressed services), (vi)landslide debris, and (vii)scouring or undercutting of the slope face, ground or road features by surface water. (d)Check retaining walls including masonry type walls: (i)tilt and horizontal misalignment, (ii)settlement and undermining of foundations, (iii)cracking (including broken tell-tales), (iv)bulging, (v)fallen debris or dislodgement of masonry blocks, and (vi)excessive seepage and/or weephole flows. (e)Look for other adverse features in the area where further deterioration may cause collapse: (i)boulders/corestones (inadequate embedment), (ii)open-jointed soil/rock faces, (iii)leaning trees, (iv)blocked slope or road drains, (v)damaged slope surface protection, (vi)pre-existing tension cracks, (vii)old drainage lines, (viii)recent changes to upslope or downslope environment (e.g. any resurfacing, demolition, site formation, utility installation, etc.) which could adversely affect the drainage characteristics of the area around the slope and road, and (ix)material that has moved or been disturbed during the present landslide but has not yet detached from the slope.
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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
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52 (a) Trash Grill at Inlet of Cros
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54 5.2.3 Drainage Improvement Works
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56 For the control of visual impact
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58 Plate 6.3 Pattern and Texture Pl
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60 ighways are environments with a
Page 63 and 64: 62 Filling operations for a highway
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Page 67 and 68: 66 Notes: (1) The responsibility fo
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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
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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
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Page 105 and 106: -A4 Notes: (-) An example of a prog
Page 109 and 110: 108 Wong, C.K.L. (1998). The New Pr
Page 111 and 112: 110 of slopes and slope owners and
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