山东莱芜侯家沟—西泉河地区岩溶塌陷成因浅析

Analysis on the Causes of Karst Collapse in Houjiagou—Xiquanhe Area in Laiwu City in Shandong Province

莱芜侯家沟—西泉河地区断裂构造、裂隙岩溶水水文地质条件复杂。该文在系统分析侯家沟—西泉河地区水文地质条件、岩溶塌陷发生历史及规模的基础上,总结了区内岩溶塌陷成因。研究表明:区内岩溶塌陷主要发生在浅部岩溶发育的侯家沟和泉河地区,发生时间多为每年汛期雨中或雨后的一段时期内,主要是岩溶地下水的频繁大幅度波动(波动范围16~40 m)造成的浅部溶洞上覆厚度约4~15 m的黏质砂土、砂质黏土遭到破坏,进而产生塌陷。

Hydrogeological conditions of fault structures and fissure karst water in Houjiagou-Xiquanhe area in Laiwu city are complicated.Based on systematic analysis of hydrogeological conditions,history and scale of karst collapse,the causes of karst collapse in the area have been analyzed systematically.It is showed that karst collapse mainly occurs in Houjiagou and Quanhe areas where shallow karst develops,and occurs during or after the rain in flood season every year.It is mainly caused by frequent and large fluctuation of karst groundwater(fluctuation range is 16~40m),which results in the destruction of the clay and sandy clay with a thickness of 4~15m over the shallow karst caves,and then the collapse occurs.