排桩支护深基坑的光弹实验模拟分析  

Simulation Analysis of Photoelastic Test on Retaining Piles for Deep Excavation

作　　者：朱彦鹏[1] 谢江 何永强[1,2] Zhu Yanpeng;Xie Jiang;He Yongqiang(School of Civil Engineering ,Lanzhou University of technology ,Lanzhou 730050 ,China;School of Civil Engineering, Northwest University for Nationalities, Lanzhou 730030, China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]西北民族大学土木工程学院,甘肃兰州730030

出　　处：《甘肃科学学报》2018年第1期68-72,共5页Journal of Gansu Sciences

基　　金：甘肃省科技重大专项计划项目(1302FKDA030)

摘　　要：基于光弹材料受力产生光学条纹原理,借助散体介质双轴加载双向流动光弹实验装置,模拟基坑开挖,并研究开挖过程中力链网络结构及其演化特征。实验结果表明:光弹实验结果与规范中的相关要求一致,从而证明了光弹实验方法对基坑开挖的离散元模拟是有效的;采用排桩对基坑周边松散土体进行支护时,距离基坑边缘24cm(相当于1倍基坑深度位置)处力链的变化最为强烈。Traditional researching problem about deep excavation is from macroscopic perspective,but it is more helpful to research engineer all-round from particle.Based on the principle that optics stripe is made by photoelastic material under force,with assist of biaxial loading photoelastic experimental device with biaxial loading in bulk medium,simulating excavation of foundation pit,the force network structure and its evolutionary character were researched in the process.The test result showed that result of photoelastic experiment is in accordance with related requirement in standard,so it is verified that photoelastic experiment method is effect for discrete element simulation of foundation pit excavation;when the relaxed soil around foundation pit is supported with piles,the force change 24 cm from the edge of foundation pit（about the depth of a foundation pit）is the most intense.

关 键 词：光弹实验 深基坑 排桩支护 力链变化 影响范围 

分 类 号：TU753[建筑科学—建筑技术科学] O436[机械工程—光学工程]