Highway Slope Manual

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5 CONTENTS Page No. TITLE PAGE 1 FOREWORD 3 CONTENTS 5 LIST OF TABLES 9 LIST OF FIGURES 10 LIST OF PLATES 12 1. INTRODUCTION 15 1.1 PURPOSE AND SCOPE 15 1.2 PROBLEMS WITH HIGHWAY SLOPES IN 15 HONG KONG 1.3 HIGHWAY SLOPE MANAGEMENT SYSTEM 20 2. PLANNING OF HIGHWAY PROJECTS 23 2.1 GENERAL 23 2.2 PLANNING OF HIGHWAY PROJECTS 23 2.2.1 Planning of New <strong>Highway</strong> Projects 23 2.2.2 Planning of Road Improvement Projects 25 2.3 GEOTECHNICAL REVIEW 25 2.4 GEOTECHNICAL ASSESSMENT 29
6 Page No. 3. SITE INVESTIGATION 33 3.1 GENERAL 33 3.2 NEW ROAD PROJECTS 33 3.3 ROAD IMPROVEMENT PROJECTS 36 3.4 OTHER CONSIDERATIONS FOR ROAD PROJECTS 37 3.4.1 General 37 3.4.2 Areas with Signs of Distress or with Known or Suspected 37 Ground Movement/Deformation 3.4.3 Geological Features Adverse to Stability of Cut <strong>Slope</strong>s 38 4. DESIGN OF SLOPES AND RETAINING WALLS 39 4.1 GENERAL 39 4.2 CONSEQUENCE CATEGORY OF HIGHWAY SLOPES 39 4.3 FACTORS OF SAFETY 40 4.4 NEW ROCK CUT SLOPES 44 5. DRAINAGE AND WATER-CARRYING SERVICES 47 5.1 GENERAL 47 5.2 SLOPE DRAINAGE AND ASSOCIATED ROAD DRAINAGE 47 5.2.1 General Considerations 47 5.2.2 Design of New Drainage Works 49 5.2.3 Drainage Improvement Works 54 5.3 WATER-CARRYING SERVICES 54 6. LANDSCAPE ASPECTS 55 6.1 GENERAL 55 6.2 PLANNING OF LANDSCAPE WORKS 56
Page 1 and 2: HIGHWAY SLOPE MANUAL GEOTECHNICAL E
Page 3 and 4: 2 。 The Government of the Hong Ko
Page 5: 4 STEERING COMMITTEE: Geotechnical
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 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
Page 69 and 70:
68 Results of Rockfall Protective B
Page 71 and 72:
70 [BLANK PAGE]
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 83 and 84:
82 [BLANK PAGE]
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 91 and 92:
90 [BLANK PAGE]
Page 93 and 94:
92 [BLANK PAGE]
Page 95 and 96:
94 key natural terrain and man-made
Page 97 and 98:
96 and details of all existing slop
Page 99 and 100:
98 [BLANK PAGE]
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
Page 107 and 108:
106 [BLANK PAGE]
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 113 and 114:
112 [BLANK PAGE]
Page 115:
114 (iv)subsidence of ground or roa
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