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针对虹源盛世超大深基坑工程复杂多样的围护结构、各向异性非均质软土地层、复杂施工工况及卸载形式等综合条件下,土体等效参数位移反分析难题,采用FEM与Nelder-Mead优化反演相结合方法,在扰动位移监测数据的基础上,通过目标参数和误差控制函数条件下的优化迭代拟合,快速反演获得工程区域土体等效弹性参数并将反演结果用于基坑后续工序的扰动位移及稳定性预测计算。结果表明,该方法可以有效避免FEM反问题计算的复杂性和收敛的不确定性,获得更加符合工程场地实际的等效力学参数,提高后续工程扰动位移场及技术风险预测的准确性和可靠性。
Aiming at the complicated and diverse enveloping structures, anisotropic heterogeneous soft soil strata, complicated construction conditions and unloading forms, the displacement back analysis problem of equivalent parameters of soil is carried out by using FEM Based on the perturbation displacement monitoring data and the optimized iterative fitting under the condition of error and error control function, the equivalent elastic parameters of soils in the engineering area are obtained quickly by inversion and Nelder-Mead inversion. DISTURBING DISPLACEMENT AND STABILITY PREDICTION CALCULATION FOR THE DEPOSIT CONCENTRATED PROCESS. The results show that this method can effectively avoid the computational complexity and convergence uncertainty of FEM inverse problems and obtain the equivalent mechanical parameters more in line with the actual engineering site conditions and improve the accuracy and reliability of the perturbed displacement field and technical risk prediction of subsequent projects .