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Rain-induced slope instability in Hong Kong

机译：香港降雨引起的斜坡失稳

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摘要

Slope failures are common in Hong Kong. A wide spectrum of slope failures have been noted. Failures may differ in respect of thickness of failed mass, time of failure occurrence, rotational inclination, failure movement rate, mobility of debris, etc. Small failures significantly outnumber large ones. Due to their close proximity to buildings, however, small failures that collapse catastrophically without prior warning are of concern.Intense rainfall, soils that are largely non-cohesive upon saturation, steep terrain, and intense development are considered to be the major causes of the failures. Loss of pore-water suction, erosion, and pore-water pressure build-up at shallow depths are the most common ways through which rainwater affects the slope stability, as short-burst rainstorms are common. The scale of a failure event depends on the intensity, areal extent, position and duration of the triggering rainstorm. Antecedent rainfall has relatively little influence.The prediction of slope stability in Hong Kong is difficult because of the highly erratic nature of the hydrological influences and the inherent heterogeneity of local soils. While some of the hydrological and geological attributes cannot be accurately predicted and effectively controlled, the hazard can be mitigated by appropriate geotechnical control.
机译：斜坡破坏在香港很普遍。注意到了各种各样的边坡破坏。失效可能在失效质量的厚度，失效发生的时间，旋转倾斜度，失效运动速率，碎屑的移动性等方面有所不同。小失效明显大于大失效。然而，由于它们与建筑物的距离非常近，因此在没有事先警告的情况下灾难性地崩溃的小故障值得关注。强降雨，饱和时基本无粘性的土壤，陡峭的地形和密集的发展被认为是造成这种情况的主要原因。失败。由于短时暴雨是常见的降雨，因此在浅水深度的孔隙水吸力损失，侵蚀和孔隙水压力的增加是雨水影响边坡稳定性的最常见方法。失败事件的规模取决于触发暴雨的强度，面积，位置和持续时间。前期降雨的影响相对较小。由于水文影响的高度不稳定性和当地土壤的固有异质性，很难对香港的边坡稳定性进行预测。虽然某些水文和地质属性无法准确预测和有效控制，但可以通过适当的岩土工程控制减轻危害。

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