丁春林. 软土地区弱透水层承压水基坑突涌计算模型研究[J]. 工程力学, 2008, 25(10): 194-199.
引用本文: 丁春林. 软土地区弱透水层承压水基坑突涌计算模型研究[J]. 工程力学, 2008, 25(10): 194-199.
DING Chun-lin. A STUDY ON CALCULATION MODEL OF INRUSHING FOR FOUNDATION PIT OF SEMIPERVIOUS AQUICLUDE WITH CONFINED WATER IN SOFT SOIL AREA[J]. Engineering Mechanics, 2008, 25(10): 194-199.
Citation: DING Chun-lin. A STUDY ON CALCULATION MODEL OF INRUSHING FOR FOUNDATION PIT OF SEMIPERVIOUS AQUICLUDE WITH CONFINED WATER IN SOFT SOIL AREA[J]. Engineering Mechanics, 2008, 25(10): 194-199.

软土地区弱透水层承压水基坑突涌计算模型研究

A STUDY ON CALCULATION MODEL OF INRUSHING FOR FOUNDATION PIT OF SEMIPERVIOUS AQUICLUDE WITH CONFINED WATER IN SOFT SOIL AREA

  • 摘要: 针对软土地区弱透水层承压水基坑,根据坑底出渗面土体稳定条件,推导了坑底弱透水层土体突涌临界破坏方程,建立了基坑突涌渗透破坏有限元计算模型,并用验证算例将模型计算结果与离心试验结果、现场观察结果、压力平衡理论结果、以及突涌塑性破坏模型结果进行了比较。结果表明:模型计算结果与离心模型试验结果和现场观察结果比较吻合,而采用压力平衡法和突涌塑性破坏模型得到的判断结果与现场实际和试验结果出入较大。对于弱透水层的承压水基坑,建议采用突涌渗透破坏模型分析基坑抗突涌稳定性。

     

    Abstract: Aiming at foundation pit of semi-pervious aquiclude with confined water in soft soil area, the critical equation of inrushing seepage failure was inferred from stability condition of soil on the bottom surface of the pit, and a Finite Element model for pit inrushing based on seepage failure was established. Calculation results of case studies were compared with the results of centrifuge test, field observation, pressure balance method and inrushing model of plastic failure. The comparison shows that the results of the model are similar to the results of centrifuge test and field observation, while the results of the pressure balance method and the inrushing model of plastic failure are not consistent with the results of the test and field observation. It is suggested that the model based on seepage failure should be used to analyze anti-inrushing stability for the pit of semipervious aquiclude with confined water.

     

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