Classification of shift
Natural slope in versatile conditions, including rock slope Man-made slope - including cut-back slope or slope formed by filled material with up to(predicate) compaction, usually provided with surface and surface drainage Man-made slope formed mainly with the support by retaining structures
Components on a well-design and maintained man-made slope
1. Surface protection such as vegetation (rigid cover (masonry, plaster or shotcrete) 2. Surface drainage (including surface channels, catch pits and sand traps) 3. Subsurface drainage (including weepholes and subsoil drain etc.) 4. Other protective provision such as prestressed ground anchors Note try to avoid the placing of water system-carrying services onto a slope
How a slope fail?
The most common failures in slopes of Hong Kong are come from the relatively shallow top soil, which foster worsened by the depth of weathering and infiltration during rainstorms situations. Slope put up collapse easily by shear if the soil is nigh saturated and high pore pressure can be built up rapidly. The falling debris carried by its possible and momentum can rush down the slope at very high speed and travel a coherent distance causing huge damages. Besides, highly decomposed rock in a slope may behave very equal to soil.
Typical failure profile for slope
Factors affecting the stability of slope
1. Topography and its contact physical conditions. Detail analysis can be make by appropriate site investigation process. 2. Geological conditions such as the nature and depth of its subsoil, degree of decomposition, or position of fracture etc. This data can be obtained by soil investigation. 3. Shear strength of the slope-forming materials. Data can be obtained using appropriate laboratory tests. 4. Surface and ground water condition 5. External loading and surcharges, such as from traffic, nigh structures, possible vibration etc.
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