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当地铁车站基坑工程场区地层地下含水量丰富,且溶洞分布密集时,施工过程中地下水含水层容易发生溶洞坍塌及涌水涌砂现象,在砂土岩溶复合地层中进行地下工程施工时,必须保证周边建构筑物的安全,控制好地面沉降。如何确保岩溶地层基坑开挖安全,进而保证隧道周边建(构)筑物安全等技术问题是基坑工程中的重难点问题。本文以广州某地铁车站为例,论述了一种适用于岩溶地区且周边环境复杂的基坑开挖的安全控制方法。施工实际监测结果表明,该方法可以有效适用于岩溶地层基坑开挖工程,控制基坑开挖对周边环境的影响、确保工程周边临近构筑物的安全,施工过程的可靠度好,对今后解决类似工程问题具有一定的借鉴意义。
When underground water content is abundant in underground excavation pit of project site of underground station and karst caves are distributed intensively, underground water aquifers prone to cave collapse and gushing and gushing sand phenomenon in construction process. During underground engineering construction in sandy karst complex stratum, Ensure the safety of the surrounding structures and control the land subsidence. How to ensure the excavation safety of the foundation pit in karst formation and then ensure the safety of the building (structure) around the tunnel is one of the most difficult and difficult problems in the excavation engineering. In this paper, a metro station in Guangzhou is taken as an example to discuss a safe control method for excavation of foundation pit which is suitable for karst area and its surrounding environment is complex. The actual construction monitoring results show that this method can be effectively applied to the excavation of foundation pit in karst formation and control the impact of excavation on the surrounding environment so as to ensure the safety of adjacent structures around the project. The reliability of the construction process is good. Engineering problems have some referential significance.