双排桩支护结构参数对深基坑稳定性的影响分析

摘要

为探讨双排桩支护结构参数对深基坑稳定性的影响,以成都某项目2A期工程的基坑支护为依托,通过运用三维有限元强度折减法,分析不同结构参数下基坑安全系数和双排桩水平位移、桩后土压力的规律,从而得出基坑不同失稳破坏模式.结果表明:在各参数的合理范围内,基坑土体呈内部剪切破坏,与陡边坡的拉裂-剪切破坏不同.%In order to discuss the impact of parameters of double-row piles supporting structure on stability of deep foundation pit,3D FEM Strength Reduction method is adopted to analyze the safety factor of foundation pit and the regularity of piles'horizontal displacement and soil pressure after piles under the conditions of different structural parameters based on the foundation pit supporting of 2A phase of a project in Chengdu,obtaining the different unstable failure modes of foundation pit.The results indicate that within the reasonable range of the parameters,the foundation pit soil is in internal shear failure,which is different with the failure of crack-shear failure of steep slopes.