老厂镇木登硐村岩溶塌陷成因机制分析

Mechanism Analysis of Karst Collapse in Laochang Town

2016年5月4日,云南红河州个旧市发生4.7级地震,受地震影响,产生了多个岩溶塌陷,木登硐村部分房屋开裂,直接影响了175户698人的生命财产安全。为了弄清木登硐村岩溶塌陷的成因机制,在塌陷发生地区开展了地面调查、地球物理勘探、水文地质调查等多项工作。结果表明:木登硐村岩溶塌陷是多种不良因素共同作用的结果,其中主要包括特殊的"水—土—岩"组合、降雨、地震及荷载因素。特殊的地质条件决定了该村岩溶塌陷发生的特殊性,分析其形成过程,认为其主要受垂直渗压效应、自重效应、土体强度效应、地震或震动效应及荷载效应的综合作用。

In May 4,2016,4. 7 grade of earthquake occurred in Gejiu City of Honghe Prefecture in Yunnan,as brought about the number of Karst collapse. It directly affected 175 households and 698 people＇s life and property safety. In order to clarify the mechanism of Genesis Tong Cun Karst,its collapse occurred in the area to carry out ground investigation,including geophysical prospecting,hydrogeological investigation and other work. The results showed that Tong Cun Karst collapse is a variety of adverse factors,including special ＂ water-soil-rock combination,rainfall,earthquake and load factors. The special geological conditions with particularity of Karst collapse is analyzed in forming process. It is considered that it is mainly affected by vertical osmotic pressure effect,including self weight effect,soil strength effect,earthquake or vibration effect and load effect.