复杂地质条件下深基坑岩土边坡稳定性研究

Study on stability of rock soil slope of deep foundation pit under complex geological conditions

复杂地质条件下深基坑岩土边坡稳定性一直是工程建设的重点研究内容。以某地区建筑工程为例,研究了复杂地质条件深基坑岩土边坡稳定性。分析该工程地形地貌以及概况,选择深坑基支护结构,计算该结构最大变形弯矩以及岩土层之间最大拉应力。利用传递系数法,计算岩土深基坑边坡稳定性,采用有限元分析法,模拟分析边坡的剪切应力。测试结果表明,支护结构的力学参数直接影响深基坑岩土边坡稳定性,深基坑开挖过程中最大位移量为2.2 mm,并且地质复杂程度的不同,对于岩土边坡稳定性的影响也存在差异;当深基坑支护结构处于极限状态时,岩土边坡位移的土体主要在接近坡脚的区域,最大位移量达到1.721 mm,并且最大剪切应力发生在接近坡脚的区域。

The stability of deep foundation pit rock soil slope under complex geological conditions has always been the focus of engineering construction.Taking a construction project in a certain area as an example,the stability of deep foundation pit rock soil slope under complex geological conditions was studied.Analyzed the landform and general situation of the project,selected the deep pit foundation support structure,calculated the maximum deformation bending moment of the structure and the maximum tensile stress between rock and soil layers.The transfer coefficient method was used to calculate the stability of the rock soil deep foundation pit slope,and the finite element analysis method was used to simulate and analyzed the shear stress of the slope.The test results showed that the mechanical parameters of the supporting structure directly affected the stability of the rock soil slope of the deep foundation pit,the maximum displacement during the excavation of the deep foundation pit was 2.2 mm,and the influence on the stability of the rock soil slope was different with different geological complexity;When the supporting structure of deep foundation pit was in the limit state,the soil mass of rock soil slope displacement was mainly in the area close to the slope toe,the maximum displacement reached 1.721 mm,and the maximum shear stress occured in the area close to the slope toe.