深圳某基坑工程岩溶地基处理案例分析

Case Study of Karst Foundation Treatment for a Foundation Pit Project in Shenzhen

深圳市属于岩溶多发区,以东部地区分布为主,且主要为覆盖型岩溶,工程地质条件差,给建设工程带来诸多不利条件。为分析深圳市岩溶地基处理技术,以深圳某基坑工程为例,首先通过岩土工程详勘、地质钻孔与地球物理勘探综合分析该工程场地岩溶地质发育情况,深入研究场地岩溶地质条件与特征,然后有针对性地提出采用高压注浆方式进行溶洞治理的方法,整体地基基础采用CFG桩复合地基+筏板基础,共同发挥CFG桩体与桩间土体的承载作用,提高岩溶地基承载力。

Shenzhen is a karst-prone city in China.The karsts are mainly developed in the eastern region and are mainly covered karsts.The poor engineering geological conditions have brought many unfavorable conditions to the construction projects.In order to analyze the technology of karst foundation treatment in Shenzhen,foundation pit project in Shenzhen was taken as an example.First,the karst geological development of the project site was comprehensively analyzed through detailed geotechnical engineering survey,geological drilling and geophysical exploration.Then,the method of using high-pressure grouting was proposed for karst cave treatment.The overall foundation adopted CFG pile composite foundation+raft foundation to jointly exert the bearing effect of CFG pile and soil between piles,so as to improve the bearing capacity of the karst formation.