基于FLAC^(3D)的土工格室挡墙工程性状及敏感性因素分析

Analysis of Engineering Properties and Sensitive Factors of Geocell Flexible Retaining Wall Based on FLAC^(3D)

以驻信高速路基边坡的土工格室柔性挡墙工程为背景,研究土工格室挡墙的工程性状和敏感性因素。通过FLAC^(3D)有限差分软件,模拟格室单元与填土的相互作用,对挡墙的受力与变形规律进行研究,并结合实体工程进行对比验证。同时,基于FLAC^(3D)强度折减法,对挡墙稳定性影响因素进行了敏感性分析。结果表明:土工格室挡墙在上覆荷载作用下,墙背应力沿墙背先增大,再减小,再增大的波动形分布,并且由墙背至墙身递减;挡墙位移曲线的斜率随墙高递减,呈"网兜"状;数值计算与现场测试得到的曲线变化规律一致,表明采用的数值模型是合理的;此外,计算表明土工格室挡墙稳定性对填土内摩擦角最为敏感。研究成果对土工格室挡墙的设计与施工具有重要的参考价值和指导意义。

Based on the research background of geocell flexible retaining wall engineering which has been applied on Zhuxin highway subgrade slope,engineering properties and sensitive factors of geocell wall have been analyzed.By using FALC^3D finite difference software,interaction between geocell with filling soil has been simulated to investigate the relationship between force and deformation of retaining wall. Simulation results have been compared with real world project. The sensitive factors of stability of geocell wall was also analyzed based on strength reduction method of FLAC^（3D）. The result shows that stress curve along the back of the wall first increases,decrease later,and increasing again. The stress reduces from the back of the wall to metope. Moreover the slope of displacement curve of retaining wall reduces along the wall and the shape is like a string bag. The results from numerical simulation has the same trend with field test which means that numerical model is a promising way. Besides,the results also showed that the friction angle of filling soil is the most sensitive factor of the stability of geocell retaining wall. This research has important value to the design and construction of geocell retaining wall.