桩基施工诱发岩溶塌陷的机理模式及防控措施  

Mechanism Model and Prevention and Control Measures of Karst Collapse Induced by Pile Foundation Construction

作　　者：马骁 蒋小珍[1] 雷明堂[1] 李亚军 贾龙[1] Ma Xiao;Jiang Xiaozhen;Lei Mingtang;Li Yajun;Jia Long(Institute of Karst Geology,CAGS/Key Laboratory of Karst Collapse Prevention,Guilin,Guangxi 541004,P.R.China;Shenzhen Investigation&Research Institute Co.,Ltd.,Shenzhen,Guangdong 518000,P.R.China)

机构地区：[1]中国地质科学院岩溶地质研究所中国地质调查局岩溶塌陷防治重点实验室,广西桂林541004 [2]深圳市勘察研究院有限公司,广东深圳518000,2021003

出　　处：《地下空间与工程学报》2023年第2期691-700,共10页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(42077273);中国地质调查局项目(DD20190266);中国地质科学院岩溶地质研究所基本科研业务费项目(2021015,2021003)。

摘　　要：随着我国城市化建设的快速发展,岩溶区所面临的岩溶塌陷问题日趋严重。其中,桩基施工诱发岩溶地面塌陷问题一直被忽视。本文以深圳市龙岗区龙园路岩溶地面塌陷事件为例,运用高频率高精度岩溶地下水气压力监测手段,分析研究桩基施工对岩溶地下水的影响及隐伏土洞发育规律。结果表明:城市更新项目桩基施工导致岩溶地下水气压力突变,使第四系底部软流塑土体流失而形成土洞,土洞不断向地面发展,最终引发岩溶地面塌陷。此外提出了岩溶区桩基施工时相应的防控措施:应在详勘阶段重视岩溶地下水气压力监测和岩溶水文地质条件分析,合理设计桩基础施工工艺,同时加强施工过程中的岩溶地下水气压力的实时监测及管控。With the rapid development of urbanization in China,the collapse hazard in karst area are becoming more and more serious.However,the problem of karst collapse induced by pile foundation construction has not been paid attention to.The Longyuan Road area in Longgang District,Shenzhen is an area with strong karst development.This paper has taken the karst ground collapse event in this area as an example,using high-frequency and high-precision karst groundwater pressure monitoring methods to analyze the influence of pile foundation construction on karst groundwater and the law of soil cave development.The results show that the renewal project is the main inducement factor,and the pile foundation construction leads to the abrupt change of water and gas pressure in the karst underground,which leads to the loss of the soft fluid-plastic soil in the bottom of the quaternary system and forms the soil cave.The soil cave develops constantly,and finally causes the collapse of the karst surface.Furthermore,it is proposed that prior to the construction of pile foundations in karst areas,attention should be paid to the analysis of karst hydrogeological conditions during the detailed investigation stage,and the monitoring of karst groundwater and gas pressure should be strengthened.Reasonably design the construction technology of the pile foundation.Furthermore,the corresponding prevention and control measures such as real-time monitoring and control of karst groundwater pressure during the construction process will be strengthened.

关 键 词：桩基施工 岩溶塌陷 塌陷机理 防控措施 地质安全 

分 类 号：P642.25[天文地球—工程地质学]