富水砂土岩溶复合地层基坑开挖施工风险控制

Risk Management of Foundation Ditch Excavation in Water-Rich Sandy Soil and Karst Composite Mix-Ground

地铁车站基坑工程地层含富水砂土层,岩溶溶洞发育。基坑施工过程中,地下含水层容易产生溶洞坍塌及涌水涌砂现象。在富水砂土岩溶复合地层中进行地下工程施工,必须保证周边建构筑物安全,控制好地面沉降。施工风险控制关键在于对富水砂土层、岩溶溶洞和岩溶裂隙发育影响因素的控制。论文以广州8号线北延段聚龙站地铁车站为案例,论述富水砂土岩溶复合地层基坑开挖风险控制方法。

The stratum of the foundation pit of subway station contains water-rich sand layer and karst caves are developed.During the construction of the foundation pit,the underground aquifers are easy to cause cave collapse and water gushing and sand gushing.Therefore,it is necessary to ensure the safety of surrounding structures and control ground subsidence.The key to controlling construction risks is to control the factors which can influence the development of water-rich sand soil layers,karst caves and karst fissures.In this paper,the Julong Station of subway station in the north extension of Guangzhou line 8 will be taken as an example to discuss the risk control methods for excavation and construction in water-rich sand soil and Karst composite foundation pit.