Highway Slope Manual

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107 APPENDIX D LANDSLIP PREVENTIVE MEASURES PROGRAMME The Geotechnical Engineering Office (GEO) of the Civil Engineering Department (CED) of the Government of the Hong Kong SAR undertakes an on-going Landslip Preventive Measures (LPM) Programme to reduce the risk of landslides arising from old manmade slopes. Most of these slopes were formed prior to the introduction of SAR-wide geotechnical control in Hong Kong in 1977. They may not meet current standards of safety and could pose a hazard to life and property. Under the LPM Programme, slopes that are of private maintenance responsibility are selected for safety-screening studies for assessing the need for serving Dangerous Hillside (DH) Orders under the Buildings Ordinance. Slopes that are of Government maintenance responsibility are selected for investigation and where necessary upgrading works carried out to bring them to current safety standards. The process of selecting slopes for action under the LPM Programme is known as 'LPM selection'. A risk-based ranking system, NPCS (Wong, 1998), has been set up to facilitate this process. For further information on the LPM process, reference should be made to GEO Information Note No. 9/99 (GEO, 1999). In 1995, the Government undertook to speed up the LPM Programme by launching a 5-year Accelerated LPM Project. This Project deals principally with old man-made slopes registered in the 1977/78 Catalogue of Slopes. The old Slope Catalogue, compiled in 1977/78, registered about 10 000 man-made slopes that were in existence before 1977. The LPM selection work for this 5-year Accelerated LPM Project has been completed and about 900 Government slopes and 1 500 private slopes have been selected via the existing LPM selection process for action under this Project. As part of the Government's commitment to further reduce the risk of landslides in Hong Kong, the GEO has started a 10-year Extended LPM Project following the completion of the 5-year Accelerated LPM Project in the year 2000. The 10-year Extended LPM Project will deal with slopes registered in the New Catalogue of Slopes, completed in 1998 and in which about 54 000 man-made slopes have been registered (Lam et al, 1998). Under this Project, a total of 2 500 Government slopes will be upgraded and safety-screening studies will be carried out on 3 000 private features by the year 2010. It is the Government's slope safety policy that all high consequence Government slopes which may affect major facilities including major roads will have been dealt with by 2010. REFERENCES Geotechnical Engineering Office (1999). Landslip Preventive Measures Works in Hong Kong - New Approaches (GEO Information Note No. 9/99). Geotechnical Engineering Office, Hong Kong, 4 p. Lam, C.C.L., Mak, S.H. & Wong, A.H.T. (1998). A new slope catalogue for Hong Kong. Proceedings of the Annual Seminar on Slope Engineering in Hong Kong, Hong Kong. A.A. Balkema Publishers, Rotterdam, pp 235-242.
108 Wong, C.K.L. (1998). The New Priority Classification Systems for Slopes and Retaining Walls (GEO Report No. 68). Geotechnical Engineering Office, Hong Kong, 117 p.
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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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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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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
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 and 104: -A2 (m) (n) 1dentify any statutory
Page 105 and 106: -A4 Notes: (-) An example of a prog
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Page 111 and 112: 110 of slopes and slope owners and
Page 115: 114 (iv)subsidence of ground or roa
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