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以北京市某深基坑支护工程为例,运用ABAQUS有限元软件,建立了桩锚支护体系分析模型,分析了不同施工工况下基坑开挖过程中的阳角效应,并与实际工程实测结果进行了对比分析。结果表明:(1)阳角凸出部位的桩体顶部最大变形量大于其他部位,该部位的锚杆力在整个开挖过程中也比较大;(2)阳角角度制约着基坑的开挖过程,同一深度处阳角角度越小,基坑开挖难度越大;(3)基坑阳角凸出长度对桩顶变形及桩体弯矩影响显著,但随着凸出长度的增大,影响效果渐弱;(4)桩体横向位移和弯矩均随基坑开挖深度的加大而逐渐增大;(5)地基最大隆起量受阳角凸出长度及基坑开挖深度影响较大,且凸出长度和开挖深度越长,影响效果越明显。
Taking a deep foundation pit supporting project in Beijing as an example, the ABAQUS finite element software is used to establish the analysis model of the pile and anchor supporting system, and the effect of the male angle during the excavation of the foundation pit under different construction conditions is analyzed. Engineering measured results were compared. The results show that: (1) The maximum deformation of the top of the pile at the convex corner is larger than that of other parts, and the anchor force of this part is relatively large during the excavation. (2) The angle of the male angle restricts the opening of the foundation pit Excavation process, the smaller the angle of the male angle at the same depth, the more difficult the excavation of the foundation pit; (3) The convex length of the foundation pit has a significant effect on pile top deformation and pile bending moment, but with the increase of the protruding length (4) The lateral displacement and bending moment of piles increase with the deepening of excavation depth; (5) The maximum uplift of foundation is affected by the protruding length of the male angle and excavation of foundation pit The greater the depth, and the convex length and the longer the excavation depth, the more obvious the effect.