深基坑桩锚联合支护系统数值分析与监测

Numerical analysis and monitoring of deep excavation combined pile-anchor support system

以某高校深基坑工程为背景,运用FLAC3D有限差分软件,研究基坑侧壁水平位移、地表沉降及坑底隆起量等技术指标随基坑开挖的变化情况。通过对比分析模拟结果与现场监测数据,对基坑的设计和施工进行稳定性评价。结果表明,桩锚支护系统能有效控制基坑开挖变形,基坑侧壁水平位移自上而下先增加后减小,最大值出现在侧壁中下部,最大沉降位置距基坑边8～9m处,最大坑底隆起量位移基坑中部。数值分析和实际监测结果较吻合,基坑支护安全可靠。

Based on some deep excavation engineering in a college, the technical indicators are studied though FLAC3 D software, which includes changes of horizontal displacement, surface subsidence and bottom heave, etc., during the processing of excavation. We propose stability evaluation on design and construction of the deep excavation according to comparing numerical simulation with the site monitoring data. The results show that pile anchor support system could control excavation deformation effectively. The horizontal displacement of excavation side wall increases first and then decreases from top to bottom, and the maximum value appears in middle and lower. The maximum vertical displacement appears at 8~9m away from excavation border and the maximum bottom heave appears in the middle of the excavation. Numerical simulation and the site monitoring agrees well which makes the construction smooth.