建筑基坑渗漏原因分析及处理措施研究

Analysis and Treatment of Seepage Failures in a Deep Excavation for a Building Structure

在强透水粉土粉砂层中,常因地质条件、地下埋藏物的复杂性等使止水帷幕受损、基坑发生渗漏、突涌导致支护体系失效。针对宿迁某建筑深基坑原高压旋喷桩止水帷幕失效导致的基坑渗漏,从止水帷幕施工、地质条件、周边环境等因素对渗漏原因展开系统分析,找出失效成因,并针对性提出渗漏补救措施,对基坑渗漏点进行有效封堵,并通过监测数据验证了补救措施的合理性和有效性,保障基坑工程施工顺利进行,为类似工程提供有效参考。

In highly permeable silty soils, cut-off curtain induced deep excavation supporting structure failures are frequently encountered under the complexity of geological conditions and underground buried objects. This paper presents a case history of jet-grouting formed cut-off wall failure in a deep excavation project in Suqian, Jiangsu Province. The detail information of subsurface conditions, adjacent existing buildings, and construction of the cut-off wall installations are presented. Factors that might result in the seepage failure and potential mitigation measures are also evaluated in the paper. Methods that were used in the seepage minimization are introduced in the paper. The site construction monitoring data verified that the cut-off wall seepage failure mitigation methods are effective.