深厚强透水地层基坑深层水平封底隔渗帷幕设计方法及其应用

来源期刊:中南大学学报(自然科学版)2020年第4期

论文作者:施成华 曹成勇 彭立敏 蒋盛钢 刘胜利 刘建文

文章页码:1012 - 1022

关键词:深基坑;强透水层;水平封底帷幕;设计方法

Key words:foundation pits; highly-permeable aquifers; bottom sealing curtains; design method

摘    要:从深厚强透水地层基坑水平封底隔渗帷幕的破坏模式入手,分别建立考虑“失稳破坏”和“渗透破坏”的基坑深层水平封底隔渗帷幕计算方法,进而对某工程实例进行计算分析,确定基坑深层水平封底隔渗帷幕的设计参数。最后,通过开展抽水试验,进一步分析基坑深层水平封底隔渗帷幕的性能。研究结果表明:基坑水平封底帷幕整体隔渗性能较好,基坑内部水位降深能够满足施工要求,且基坑外水位降深基本无变化;在抽水后期水位稳定阶段,基坑深层水平封底隔渗帷幕渗水量低于设计的最大可容许渗水量。

Abstract: Based on different failure mechanisms of horizontal bottom sealing curtains for deep excavations that are undertaken in deep aquifers with high permeability, computational methods for horizontal bottom sealing curtains were established considering “instability failure” and “seepage failure” mechanisms, respectively. Then, the design parameters of bottom sealing curtains for an excavation case were determined using the established methods. Finally, the performance of deep horizontal bottom-sealing curtains was analyzed through pumping tests. The results show that the water-tightness performance of horizontal bottom-sealing curtains constructed at site is good. The water level inside the excavation can meet the construction requirements, and the water level outside the excavation has no change basically during pumping tests. When the water level stabilizes at the final period of the pumping test, the leakage of bottom-sealing curtains is lower than the maximum designed allowable seepage.

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