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针对三维数值分析法应用于边坡工程时遇到的一些问题,总结了一套操作便捷的分析流程。针对计算模型的建立,首先利用MIDAS/GTS的地质生成器TGM从AutoCAD导入地形及地层的等高线图,实现复杂边坡的三维几何可视化;然后提出了一种基于MIDAS/GTS和FLAC3D不同的网格数据识别格式,直接利用Excel电子表格实现数据转换,将前者的三维网格模型导入后者进行大变形计算。针对稳定性分析方法,归纳了位移、主应力、偏应力、剪切应变、塑性区及安全系数6类指标的内涵及其用于边坡稳定性分析的合理性,总结了上述指标在边(滑)坡中的一般规律和评判方法,并提出了一些相关建议。利用所述技术和方法对新疆S316线一处路基边坡进行案例分析,验证了其可行性和可靠性。
Aiming at some problems encountered in the application of three-dimensional numerical analysis to slope engineering, a set of easy-to-operate analysis flow is summarized. For the establishment of the computational model, firstly, the geomorphic TGM of MIDAS / GTS is used to import the contour map of terrain and formation from AutoCAD to realize the 3D geometric visualization of complex slopes. Then, a new method based on MIDAS / GTS and FLAC3D Mesh data identification format, the direct use of Excel spreadsheets to achieve data conversion, the former three-dimensional mesh model into the latter large deformation calculation. According to the method of stability analysis, the connotation of six kinds of indexes of displacement, principal stress, deviatoric stress, shear strain, plastic zone and safety factor are summed up and their rationality for slope stability analysis are summarized. Slip) slope of the general rules and evaluation methods, and put forward some suggestions. A case study on a subgrade slope of S316 line in Xinjiang using the above techniques and methods is conducted to verify its feasibility and reliability.