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24 cm(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.
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