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为得到更加真实准确的深基坑施工过程各土层参数值,确保深基坑工程质量和安全稳定性,以大连某地铁车站深基坑工程为研究背景,根据现场地下连续墙水平位移实测数据,采用正交设计法对各土层参数进行敏感性分析,然后,基于差异进化多参数反分析方法,对深基坑各土层参数进行静态和动态位移优化,最后,根据地下连续墙体水平位移现场监测数据,对数值模拟结果进行辅助验证。研究结果表明:动态反分析的土层参数值更接近土层真实值,利用动态反分析得到的土层参数进行数值模拟分析,其结果比静态反分析模拟结果更接近实际监测数据,从而验证了该方法的合理性和正确性,为后续深基坑稳定性研究和变形预测提供技术支持。
In order to get more true and accurate parameters of each soil layer in deep foundation pit construction process and ensure the quality and safety of deep foundation pit engineering, taking the deep foundation pit project of a metro station in Dalian as a research background, according to the measured data of horizontal displacement of diaphragm wall , The orthogonal design method is used to analyze the sensitivity of each soil layer parameters. Then, based on the differential evolution multi-parameter back analysis method, the static and dynamic displacement of each soil layer parameters of deep foundation pit are optimized. Finally, Displacement monitoring data on site, the numerical simulation results to assist verification. The results show that the soil parameters of the dynamic back analysis are closer to the true values of the soil layers and the soil parameters obtained from the dynamic back analysis are numerically simulated. The results are closer to the actual monitoring data than the static back analysis. The rationality and correctness of this method provide technical support for the subsequent deep foundation pit stability research and deformation prediction.