岩溶地质条件下桩基抽芯孔涌水堵漏及桩底加固技术研究

Research on Pile Foundation Core Pulling Hole Leakage and Pile Bottom Reinforcement Technology under Karst Geological Condition

广东省部分地区不同程度存在岩溶现象,在岩溶地质发育地区进行深基坑开挖施工作业,当基坑开挖至基底范围后进行混凝土工程桩钻孔抽芯检测时,存在发生溶洞承压水沿抽芯孔喷涌出、基底而诱发基坑涌水的风险。结合工程实例,论述了针对混凝土工程桩抽芯孔涌水风险所采取的堵漏及桩底持力层加固技术措施,及时有效地消除了基坑涌水风险,同时确保了桩基承载力满足设计要求。

There are karst phenomena in some areas of Guangdong Province to varying degrees.Deep foundation pit excavation is carried out in areas with karst geology development.When the foundation pit is excavated to the basement area and the concrete engineering pile is drilled and core-pulled,there is a risk that the pressure-bearing water of the karst cave gushing out along the corepulling hole and the foundation pit water gushing out.Combining with the engineering example,discusses the technical measures of plugging leakage and reinforcing the bearing stratum at the bottom of the pile in view of the risk of water gushing from the core-pulling hole of the concrete pile,which can effectively eliminate the risk of water gushing from the foundation pit in time and ensure that the bearing capacity of the pile foundation meets the design requirements.