高富水、强透水卵石地层深基坑降水设计与实践

Dewatering Design and Practice of Deep Foundation Pit in High Water-rich and Strong Permeable Cobble Stratum

以常德沅江过江隧道江南工作井作为工程实例,通过对周边地层、水文特性的了解分析,从抽水试验、井位布设、抗突涌验算、沉降分析、坑外回灌等各方面进行了初步的分析,对降水相关的各项技术措施进行了梳理,通过工程实践对降水方案的可行性进行了论证,对类似高富水、强透水卵石地层条件下的深基坑降水施工具有一定的借鉴意义。

Taking the example of Jiangnan working shaft of Changde Yuanjiang river-crossing tunnel, based on the obtained hydrological characteristics and the surrounding strata conditions, the paper makes a preliminary, analysis on various aspects such as pumping test, well location layout, anti-inrush checking, settlement analysis and recharge smTounding the founda- tion pit, and the technical measures related to dewatering are reviewed. The feasibility of the dewatering scheme has been demonstrated through the engineering practice, which will be meaningful to the deep foundation pit construction in the simi- lar high water-rich and strong permeable cobble stratum.