深基坑支护空间效应研究

Research on supporting space effect of deep foundation pit

基于相容、连续原则假定了基坑破坏面情况,纯剪切破坏模式进行理论公式推导,得到空间效应系数的理论表达方式。根据工程实际案例,选取地勘参数,利用实际地形条件,进行FLAC3D的三维模型分析,通过对支护桩不同截面的受力变化情况推求数值模拟计算情况下实际工程的空间效应情况。结果表明,理论公式推求曲线和数值模拟结果趋势相同,证明了理论推导的正确性,并为工程实践提供参考。

Based on the principle of compatibility and continuity,the failure surface of the foundation pit is assumed,and the pure shear failure mode is deduced from the theoretical formula to obtain the theoretical expression of the space effect coefficient. According to the actual case of the project,the geological survey parameters are selected,and the actual terrain conditions are used to analyze the 3D model of FLAC3D. The spatial effect of the actual project under the numerical simulation calculation is calculated through the change of the force of the different sections of the supporting pile. The results show that the theoretical formula deduction curve and numerical simulation results have the same trend,which proves the correctness of the theoretical derivation and provides a reference for engineering practice.