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在地下工程数值模拟计算中,土体变形模量的取值对计算结果影响很大,然而多数数值模拟计算忽视了土体变形模量随着埋深的变化。本文以郑机城际线机场站基坑工程为依托,假定土体变形模量随着埋深呈线性增大趋势,通过模拟现场抗拔桩实验,并对比模拟计算结果与现场实验数据,得出了相应土体摩尔库仑模型的变形模量与埋深之间的近似线性关系。研究所得土体变形模量参数进一步应用于依托工程中的支撑轴力的数值模拟计算,数值模拟计算结果与现场监测数据较为吻合,进一步验证了该参数取值方法的合理性,计算结果能够有效地指导施工。该数值模拟抗拔桩实验获取土层变形模量的方法可为类似工程提供有价值的参考。
In the numerical simulation of underground engineering, the value of soil deformation modulus has a great influence on the calculation results, however, most numerical simulation ignores the change of soil deformation modulus with depth. Based on the excavation engineering of Chengji intercity railway station, assuming that the deformation modulus of soil increases linearly with depth, by simulating the uplift pile test in the field and comparing the results of simulation with the field experimental data, Approximate Linear Relationship Between Deformation Modulus and Buried Depth of Mohr Coulomb Model for Corresponding Soils. The parameters of soil deformation modulus obtained from the study are further applied to the numerical simulation of the support axial force in the project. The numerical simulation results are in good agreement with the field monitoring data to further verify the rationality of the method and the calculation results can be effective To guide the construction. The numerical simulation of the method of experimentally obtaining the deformation modulus of the soil can provide valuable reference for similar projects.