广西来宾市良江镇吉利村岩溶塌陷成因机制分析

发布时间：2018-11-13 15:26

【摘要】：2010年6月,一场极端暴雨事件过后,广西来宾市良江镇吉利村发生大规模岩溶塌陷,一个月内陆续产生了17处塌陷坑,其中3个塌陷坑逐渐扩大发展,最终形成一长约170m,深约38m的大塌陷坑,被称为"广西第一塌"。此次塌陷事件影响面积约1 500m~2,导致70户298人搬离家园。为了弄清吉利村岩溶塌陷的成因机制,在塌陷发生地区开展了地面调查、三维激光扫描、地球物理勘探、水文地质工程地质钻探、岩溶塌陷动力条件监测、降雨量监测等多项工作。分析结果表明:吉利岩溶塌陷为自然塌陷,是多种不良因素共同作用的结果,这些因素包括特殊的"水-土-岩"组合和极端暴雨,其中极端暴雨引起的地下水气压力的急剧变化是其主要动力因素;特殊的地质条件,决定了该区岩溶塌陷发生的特殊性,分析其形成过程,认为主要受气爆效应、水击效应和渗流潜蚀效应的综合作用。
[Abstract]:In June 2010, after an extreme torrential rain event, a large scale karst collapse occurred in Geili Village, Liangjiang Town, Laibin City, Guangxi. Within a month, 17 collapse pits were produced one after another, three of which gradually expanded and developed, resulting in a long period of about 170 m. Deep about 38 m large collapse pit, known as the "first collapse in Guangxi." The collapse affected an area of about 1,500 mm2, resulting in 70 families and 298 people moved from their homes. In order to understand the genetic mechanism of karst collapse in Jiili village, ground survey, 3D laser scanning, geophysical exploration, hydrogeological engineering geological drilling, dynamic condition monitoring of karst collapse were carried out in the area where the collapse occurred. Rainfall monitoring and other work. The results show that the karst collapse in Geely is a natural collapse, which is the result of the joint action of many adverse factors, including the special "water-soil-rock" assemblage and the extreme rainstorm. Among them, the drastic change of underground water and gas pressure caused by extreme rainstorm is the main dynamic factor. The special geological conditions determine the particularity of karst collapse in this area. The formation process of karst collapse is analyzed. It is considered that the combined action of gas explosion effect, water hammer effect and seepage potential erosion effect is the main factor.
【作者单位】：中国地质科学院岩溶地质研究所/中国地质科学院岩溶塌陷防治重点实验室;
【基金】：国家自然科学基金项目(41472298) 中国地质调查项目(1212011220191、DD20160254) 国土资源部公益专项(201211083)
【分类号】：P642.25

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