摘要
依据大量勘查资料 ,从岩溶塌陷形成条件及其主要影响因素入手 ,分析和探讨了它们对桂林市西城区岩溶塌陷的影响。结果表明 ,覆盖层特征、岩溶发育程度、地下水等对岩溶塌陷的产生有着重要影响。覆盖层土体结构越疏松、级配越好、强度越低、厚度越小 ,岩溶越发育 ,越容易产生土洞和塌陷 ;在相同条件下具有混杂结构的覆盖土层最易产生塌陷 ;地下水活动则促使或加速土洞及岩溶塌陷的形成。此外 ,地质构造、地表水与人类工程活动对岩溶塌陷也有重要影响 ,它们常作为诱发动力 ,通过改变基本条件而加速岩溶塌陷的形成。
Based on plenty of prospecting data, the paper analyzes the conditions of formation and main influential factors of karst collapse.It is indicated that the characteristics of overburden layer, development degree of karst and activities of groundwater have important influence on the formation of karst collapse. The more loose the structure of overburden layer, the more well soil gradation, the more low the sthength, the more thin the layer, the more intensive karst developments, the more easily earth cavity and collapse occur. At the same conditions, collapse occurs most easily in overburden layer with mixing structure. And activities of groundwater promote formation of earth cavity and karst collapse. Besides, geological structure, surface water and human engineering activities also have important influence on karst collapse. As an inducement power, they speed up formation of karst collapse through changing basic conditions.
出处
《桂林工学院学报》
2000年第2期100-105,共6页
Journal of Guilin University of Technology
基金
国家计委防灾减灾项目!(编号 :计司国地 [1996] 12 )部分研究成果
关键词
岩溶塌陷
形成条件
影响因素
桂林市
karst collapse
forming condition
influential factor
Guilin city
