考虑坑角效应的深基坑围护体系分析和研究

摘要

利用理正深基坑软件对深基坑进行模拟计算,结合坑角效应理论重点研究了坑角效应下基坑角部附近土压力变化、位移变化和坑角效应影响范围的变化规律.坑角效应是指在深基坑开挖及支护过程中,深基坑坑角附近的土压力、位移等异常于普通平面情况下的土压力、位移的一种现象.坑角效应作用可以采用坑角效应影响系数来衡量,且深基坑支护结构在坑角效应的影响下,距离基坑端部越远,基坑坑角效应越小;基坑越小,坑角效应越明显;基坑开挖越深,坑角效应越显著;基坑的长宽比在1~2时,长宽比变化对坑角效应影响较显著,基坑长宽比大于2时,长宽比变化对坑角效应影响不明显.基坑开挖深度与坑角效应影响呈正相关,开挖越深,坑角效应越明显,开挖越浅,坑角效应影响越弱.%The simulation method is used to simulate the deep foundation pit,and the variation law of the change of the earth pressure,the change of the displacement and the influence range of the pit angle effect are studied emphatically.Pit corner effect refers to the phenomenon of earth pressure and displacement near the pit corner in the deep foundation pit excavation and support during the deep foundation pit,which is abnormal in earth pressure and displacement in the ordinary plane.The effect of the pit angle effect can be measured by the influence coefficient of the pit angle effect.The effect of the deep foundation pit support structure is greater than the end of the foundation pit.The effect of aspect ratio is more obvious.The deeper the pit excavation is,the more the pit angle effect is more significant;the aspect ratio of the foundation pit is 1~2,the aspect ratio change has a significant effect on the pit angle effect.The effect of aspect ratio on pit angle is not obvious.There is a positive correlation between excavation depth and pit angle effect.The deeper the excavation is,the more obvious the pit angle effect is,the more the excavation is,the weaker the effect of the pit angle effect.