The Study On The Spatial Effect Of Excavation Process Based On Numerical Simulation

In recent years, the space effect of foundation pit is more and more concerned by the academic and engineering circles. At the same time, in the deep foundation pit support design, the application of the foundation pit space effect is becoming more and more remarkable. In this paper, the foundation pit as three-dimensional space structure, using finite difference software of foundation pit excavation process was simulated, research in the foundation pit of the spatial effect of foundation pit excavation of the influence of soil nailings support optimization.Firstly, the application of finite difference software of foundation pit excavation simulation and shifting of foundation pit slope side, each layer of soil lateral displacement, each layer of soil lateral shift stress, surface subsidence four aspects carries on the reorganization and the analysis. The simulation results are drawn, and the law of the spatial effect of foundation pit is summarized in the above four aspects.Secondly, a foundation pit in Shijiazhuang city as the research object, the use of finite difference software for the excavation of the foundation pit. The foundation pit model is soil nailing, and the layout of soil nailing is in agreement with the engineering practice. On the side of the foundation pit slope shift, each layer of soil lateral displacement, each layer of lateral soil movement should force, soil nailing axial force four aspects carries on the reorganization and the analysis, according to the soil nailing retaining specific engineering, studies the variation law of the spatial effect of foundation pit. And compared with the actual monitoring data, the rationality of the model is demonstrated.Finally, through the above foundation model simulation results were analyzed summarized the influence of space effect and the influence of space effect for 0.5- 0.6times the pit crater depth; in addition, in the premise of ensuring the safety of foundation pit in four aspects, according to the foundation for each position of the stress and deformation distribution of different, of soil nailing re arrangement and the results are as follows: pit angle did not support range and excavation depth has a linear relation, namely Jiao Keng not support range of about 0.6 times of theexcavation depth.