基于增量法的深基坑阳角变形数值模拟

Numerical simulation analysis of deep foundation pit positive corner deformation based on incremental method

为研究深基坑阳角变形归律,基于增量计算法并借助于FLAC-3D软件对基坑工程中的阳角进行有限差分数值模拟.研究结果表明:在支护结构及支护方式相同情况下,先开挖标准段后开挖端头井的方法更利于阳角稳定且阳角最大位移比原施工方案减少了约45%;发现阳角位移随钢支撑截横面积减小而呈指数型衰减的趋势,给出了类似工程钢支撑横截面积的合理参考区间0.06~0.09 m^2.

Finite difference numerical simulation on the negative corner is, based on incremental calculation method, by means of FLAC^3D, conducted in order to study the negative corner deformation law of deep foundation pit. Results show that the method of end well excavation after standard segment excavation is more conducive to the stability of negative corner and the maximum displacement of negative corner is 45% less than the original construction plan under the identical condition of supporting structure and way and that displacement of positive corner presents attenuation trend with the decrease of cross sectional area of steel support and that the reasonable reference range of cross sectional area—0.06 ～ 0.09 m^2— of steel support in similar engineering is given. The research can provide reference for similar foundation pit engineering, which makes the construction of irregular foundation pit more reasonable, reliable, safer and economical.