基于开挖响应的软土基坑地下连续墙多目标优化设计  

Multi-objective Optimization Design of Diaphragm Wall in Soft Soil Foundation Pit based on Excavation Response

作　　者：李志星 陈欣蔚 石博 于洋[2] 薛博阳 Li Zhixing;Chen Xinwei;Shi Bo;Yu Yang;Xue Boyang(Beijing Road and Bridge,Beijing 100045,China;Ocean College,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]北京市政路桥股份有限公司,北京100045 [2]浙江大学海洋学院,浙江舟山316021

出　　处：《市政技术》2022年第11期24-29,共6页Journal of Municipal Technology

基　　金：浙江省自然科学基金(Y21D020004)。

摘　　要：为掌握软土基坑地下连续墙受力变形特征,探索有效的多目标优化设计方法,以绍兴市地铁1号线阳和路站基坑工程为研究对象,通过现场取样和室内试验,测定了典型软土物理力学参数,建立了数值模型,利用实测数据验证了模型的准确性;以地下连续墙受力变形、基坑安全系数和工程造价为优化目标,基于鲁棒性设计原理,实现了地下连续墙厚度与深度的多目标优化设计。研究结果表明,考虑最大水平位移、抗倾覆安全系数和每延米体积3个优化目标时,地下连续墙最优设计参数为墙厚1000 mm、深度30 m;考虑最大水平位移与每延米体积2个优化目标时,地下连续墙最优设计参数为墙厚800 mm、深度32 m;考虑的优化目标越多,需要付出的成本就越高。In order to investigate the stress and deformation characteristics of diaphragm wall in soft soil foundation pit and explore an effective multi-objective optimization design method,the foundation pit project of Yanghe Road Station of Shaoxing Metro Line 1 is taken as the research object.Through on-site sampling and indoor experiments,the physical and mechanical parameters of typical soft soil are measured,and the numerical model is established.The accuracy of the model is verified by the measured data;The stress deformation,the safety factor of foundation pit and the engineering cost is the optimization objectives.Based on the robust design principle,the multi-objective optimization design of the thickness and depth of the diaphragm wall is realized.The research results show that when the maximum horizontal displacement,the anti-overturning safety factor and the volume per linear meter are considered as the 3 optimal objectives,the optimal design parameters are 1000 mm in thickness and 30 m in depth;When the maximum horizontal displacement and the volume per linear meter are considered as the 2 optimal objectives,the ones are 800 mm in thickness and 32 m in depth;The more optimization objectives,the higher the project cost.

关 键 词：软土 基坑 地下连续墙 数值模拟 优化 

分 类 号：TU447[建筑科学—岩土工程] TU476.3[建筑科学—土工工程]