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采用Z_Soil流固耦合模型分析路堤堆载下的土工织物散体桩复合地基的稳定性和破坏模式。通过三维模型试验对路堤荷载下的孔隙水压力、变形和稳定性进行了较为详细的分析,然后将三维模型转化为二维模型,采用二维模型中抗剪等效、抗弯等效和可使用抗剪等效分别与极限平衡法进行稳定系数的对比,探讨合理的桩土复合地基破坏模式。模拟及计算结果表明,土工织物散体桩能够缩短次固结时间,使路基沉降在很短的时间内完成,在不断调整折减系数下土工织物散体桩的破坏模式为弯曲破坏,按剪切破坏模式将过高估计复合地基的稳定性。
The Z_Soil fluid-structure interaction model is used to analyze the stability and failure modes of geotextile composite pile under embankment load. Through three-dimensional model test, the pore water pressure, deformation and stability under embankment load are analyzed in detail. Then the three-dimensional model is transformed into the two-dimensional model. The two-dimensional model is equivalent to shear resistance, The equivalent coefficients of shear equilibrium and limit equilibrium method are compared respectively to discuss the reasonable failure mode of composite foundation. The results of simulation and calculation show that the geotextile composite pile can shorten the secondary consolidation time and make the subgrade settlement within a short period of time. The failure mode of the geotextile composite pile is bending failure under the constant reduction coefficient, The failure mode will overestimate the stability of the composite foundation.