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基于基坑坑底隔水层在承压水作用下承受过量弯矩发生压剪破坏或拉裂破坏假设,分别推导出了考虑土体抗剪强度和抗拉强度的基坑突涌判别公式。与现有的基坑突涌判据认为基底隔水层边缘最先发生破坏的结论不同,本判据认为基底隔水层中间部位最先发生破坏。并通过简易的基坑突涌物理试验,试探性验证了基坑基底中间部位最先发生破坏的现象。依托实例,基底隔水层临界厚度计算结果表明,除与压力平衡法的计算结果差别较大外,与其他基坑突涌评价方法的计算结果均较为接近。仅就算例和模型试验来看,利用该判据理论进行基坑突涌分析比目前规范规定的分析方法更接近实际,但需经大量工程实践的检验。
Based on the hypothesis that the bottom aqueduct under overpressure water under pressure to withstand excessive pressure bending shear failure or tensile failure, respectively, to derive the soil excavation shear strength and tensile strength of the pit outburst discriminant formula. Different from the conclusion that the existing excavation criterion of foundation excavation determines that the edge of the aquifuge is the first to be destroyed, the judgment of this criterion is that the aqueduct in the middle of the aqueduct is the first to be damaged. And through the simple pit inrush physical test, tentatively verified the foundation pit bottom of the first occurrence of the phenomenon of destruction. Relying on the example, the calculation results of the critical thickness of the aquifuge show that the calculated results are in good agreement with those of other excavation methods, except for the difference between the calculated result and the pressure balance method. Only for the examples and model tests, the analysis of pit inrush using the criterion theory is closer to the actual analysis than the current normative analysis method, but it needs to be tested by a large number of engineering practices.