皖中膨胀土的危害机理研究

Mechanism of hazards caused by expansive soils in the middle of Anhui Province

皖中胀缩土具有典型膨胀土所特有的低重度(19 7～20 1kN m3)、高孔隙比(0 69～0 92)、高含水量(26 7%～39 0%)、高分散性(<2μm的含量30%～40%)、强收缩(体缩12%～21%)等一系列不良的工程地质性质。根据皖中一些构筑物产生开裂的地质灾害问题,文章系统地分析了与灾害密切相关的上更新统土体的胀缩特性及其内在的组织结构、矿物组成、化学成分之间的关系,阐述了区内膨胀土的分布特征及其与灾害分布的相互关系。从而,为确定灾害成因和治理提供了科学的依据。

In the midle of Anhui Province,expansive soil has a series of bad engineering properties such as low unit weight (about 197～201?kN/m3), high void ratio(069%～092%), high water content(267%～390%), high dispersibility(<2?μm grains 30%～40%), and high contractility(bulk shrinkage 12%～21%),which are typical characteristics of expansive soils.In view of the fact that lots of buildings and ground were broken in the middle of Anhui Province, the expansionshrinkage characteristics, the internal structure, mineralogical and chemical composition of the upper Pleistocene soil have been systematically analysed. The relation between the distribution of the expansive soil and the geologic hazard has been discussed. This research is specially important to finding out the cause of forming hazard and control it.