锚杆和排桩联合支护二级基坑的有限元分析

Finite Element Analysis for 2-step Foundation Pit Supported by Anchors and Piles

对于上部采用土层锚杆下部采用排桩支护的二级基坑,一般情况下计算时把基坑分成上下两部分各自进行,而忽略其相互影响。本文采用有限元软件PLAXIS对某二级基坑开挖的全过程进行模拟,并分析了在下部基坑开挖支护过程中上部的增量变形和锚杆轴力的变化,结果表明随基坑滑移面的转移,上部锚杆支护坡面的变形进一步增大,而各层锚杆的轴力则变化很小。

For 2-Step foundation pit supported by anchors and piles respective the upper and lower part, under normal circumstances in the calculation it is separated into two isolated parts, and ignored the interaction between. In this paper the author uses finite element software PLAXIS to simulate the whole process with a project, and analyses influences of the upper the incremental deformation and anchor axial force during the lower part excavation; has obtained as the transfer slip surface, the upper slope surface deformation increases, while the axial force of anchors on each layer changes very little.