层状地基土水平抗力比例系数反演的杂交粒子群算法  

Inversion of the constant of modulus of horizontal subgrade reaction by hybrid particle swarm optimization algorithm in layered soil

作　　者：朱伟鑫 孙前林 吕乐 王旭东[1] ZHU Weixin;SUN Qianlin;LV le;WANG Xudong(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 211800,China;The Third Construction Co.,Ltd.,China Construction Eighth Engineering Division,Nanjing 210046,China)

机构地区：[1]南京工业大学岩土工程研究所,江苏南京211800 [2]中建八局第三建设有限公司,江苏南京210046

出　　处：《南京工业大学学报（自然科学版）》2024年第1期84-92,共9页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：上海隧道工程有限公司科研项目(2021-SK-21)。

摘　　要：土的水平抗力比例系数是基坑支护结构变形计算的重要参数,针对层状地基土中水平抗力比例系数反演的多目标优化问题,结合支护结构水平位移实测值和杆系有限元法,提出基于粒子群算法(PSO)的层状地基土水平抗力比例系数反分析法。给出水平抗力比例系数和目标函数精度双控的反演计算收敛条件和水平抗力比例系数最优解稳定条件。在利用基坑工程数值模型验证反演参数准确性基础上,运用工程实例进一步验证杂交粒子群算法(breedPSO)在水平抗力比例系数反演计算中的适用性。对比分析优化方法的计算效率和反演参数的收敛特性。结果表明:杂交粒子群算法具有更高的计算效率和计算精度,为合理反演水平抗力比例系数提供了有效途径。The constant of modulus of horizontal subgrade reaction is an important parameter for deformation calculation of supporting structure in excavations.For the multi-objective optimization problem of inversion of the constant of modulus of horizontal subgrade reaction in layered soil,a back analysis method based on particle swarm optimization(PSO)was proposed which combined with the measured lateral deformation of retaining wall and finite element method for beams.A dual control convergence condition based on precision of the constant of modulus of horizontal subgrade reaction and the objective function were introduced for inversion calculation.The stability conditions of the optimal solutions were given.On the basis of verifying the accuracy of inversion parameters by the numerical model of excavation,the engineering applicability of hybrid particle swarm optimization(breedPSO)algorithm in excavation was further verified by engineering case.In addition,the computational efficiency of different optimization methods and the convergence characteristics of the constant of modulus of horizontal subgrade reaction were discussed.The results showed that the breedPSO algorithm had higher computational efficiency and accuracy,which provided an effective way to estimate the constant of modulus of horizontal subgrade reaction reasonably.

关 键 词：基坑 层状地基土 水平抗力比例系数 杂交粒子群算法 反分析 

分 类 号：TU463[建筑科学—结构工程]