桂林市西城区岩溶塌陷形成条件及主要影响因素

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的影响。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和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

ANALYSIS OF FORMING CONDITIONS AND MAIN INFLUENTIAL FACTORS OF KARST COLLAPSE IN WEST URBAN DISTRICT, GUILIN CITY

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.