关键词: 侵蚀速率, 裂隙, 降雨, 崩岗治理, 花岗岩风化壳, 中国南方

Abstract: Hillock collapse is a major threat to the security of local ecology, food, flood control and human settlement in south China. Rainfall infiltration would cause soil swelling and shrinkage, increase soil collapse potential, reduce soil shear strength and cohesion, increase soil mass weight and enlarge the soil crack, thus resulting in numerous soil collapse with the maximum collapse rate up to 11.7 m / a. Currently comprehensive control measures for hillock collapsing erosion can be summarized as: building drainage ditch or planting hedgerow on hillock, cutting gully slope, building check dam at hillock foot, afforesting all over the hillock. However, if the above structure measures can not effectively resist massive precipitation into soil, the hillock collapse will aggregated instead. The investigation discovered that ecological forest can prevent the development of hillock collapsing very effectively. Consequently, the traditional structural hillock collapse control should be transformed to ecological restoring, which can reduce manual labor and save money to a certain.

Key words: weathering granite crust, crack, precipitation, erosion velocity, hillock collapse, Southern China