均匀设计法在淤泥刚度参数确定中的应用

Application of Uniform Design Method in Determination of Silt Stiffness Parameters

通过对深圳地铁12号线和平站基坑工程淤泥土层进行数值模拟计算和参数反演分析,证明硬化土模型(HS模型)除可以模拟硬土之外,对于模拟软土的土体行为也具有有效性。通过均匀设计法结合Plaxis2D有限元软件对刚度参数进行了反演分析。结果表明:均匀设计表法有效减少了参数反演分析中刚度参数取值次数和数值模拟分析次数,将有限元模拟计算与均匀设计法结合来进行淤泥土层的参数反演具有合理性;该工程参数反演的淤泥土层参考割线模量为6 MPa、参考切线模量为6.51 MPa、参考卸载再加载模量为40.6 MPa;得到了刚度参数与土体强度指标之间的一般关系式,淤泥土层刚度参数取值合理科学。

Through the numerical simulation and parameter inversion analysis of the soil layer in the foundation pit of Heping Station of Shenzhen Metro Line 12,it was proved that the hardened soil model(HS model)can effectively simulate the soil behavior for both hard and soft soil.Through uniform design method and Plaxis2D finite element software,the stiffness parameters were inversely analyzed.The results show that the uniform design method can effectively reduce the number of stiffness parameter values and the number of numerical simulation analysis in parameter inversion analysis,and it is reasonable to combine finite element simulation with uniform design method to carry out parameter inversion of silt soil layer.The reference secant modulus,tangent modulus and unloading reloading modulus of the silt soil layer retrieved from the project parameters are 6 MPa,6.51 MPa and 40.6 MPa respectively.The general relationship between stiffness parameters and soil strength index is obtained,and the stiffness parameters of silt soil layer are reasonable and scientific.