岩溶地层地铁车站基坑桩锚组合围护结构安全性分析

以徐州城市轨道交通2号线淮塔东路站为例,建立一个符合实际工程的三维模型,通过赋予土体null模型和建立围护结构单元来实现基坑开挖围护的连续施工过程,验证了工程施工的合理性。同时,提出了岩溶地层深基坑桩锚支护工程中的围护桩及锚索的施工工艺、提出了溶洞边钻、边灌、边探边界的钻孔注浆方法,并分析总结了其质量保证措施及质量控制标准,可为今后岩溶地层基坑开挖围护结构的选取及溶洞处理提供借鉴。

Safety Analysis of Pile-anchor Combined Retaining Structure for Foundation Pit of Metro Station in Karst Stratum

Taking Huaita East Road Station of Xuzhou Urban Rail Transit Line 2 as an example,a three-dimensional model in line with the actual project is established.The continuous construction process of foundation pit excavation and enclosure is realized by giving soil null model and establishing enclosure structure unit,and the rationality of engineering construction is verified.At the same time,this paper puts forward the construction technology of retaining pile and anchor cable in deep foundation pit pile-anchor support engineering in karst stratum,puts forward the drilling grouting method of karst cave drilling,grouting and exploration boundary,and analyzes and summarizes the quality assurance measures and quality control standards,which can provide reference for the selection of foundation pit excavation retaining structure and karst cave treatment in karst stratum in the future.