基于剑桥模型破坏准则黄土高边坡稳定性研究

对剑桥模型的破坏准则并进行了补充改进,使其适用于黄土高边坡稳定性分析。通过室内试验取得了不同含水量下黄土的抗剪强度参数及对应的临界应力比。采用FLAC有限差分软件对不同坡角的边坡进行数值计算;并用MAPGIS软件DTM空间分析功能对计算结果进行图形后处理。基于以上工作,研究黄土高边坡体内应力分布特点、黄土高边坡稳定的应力影响因素、潜在不稳定区域和边坡破坏模式。探讨含水量变化对边坡临界应力比和实际应力比的影响规律,分析应力比变化对边坡稳定性影响程度。揭示随着含水量的增加,内摩擦角和黏聚力减小对边坡稳定性影响的不同力学意义。

Research on Stability of High Loess Slope Based onCam-Clay model failure criterion

By the failure criterion of Cam-Clay model were added to improve, Make it suitable for high loess slope stability analysis; through indoor soil test of Loess with different water content, abtain shear strength parameters and the corresponding critical stress ratio; stress of different slops angle was calculated by using the FLAC finite difference numerical calculation software, and by using the spatial analysis function of MAPGIS software DTM, post processing of graphics of calculation result were completed. Based on the above work, study the loess high slope body stress distribution characteristics, the stress influence factors of loess high slope stability, potential instability region and the slope failure mode. To investigate the effect of water content of soil slop on the critical stress ratio and actual stress ratio, and analyzed the effect on the degree of slope stability of variation of stress ratio. Reveals that with the increasing of water content, reduced internal friction angle and cohesive force, have the different mechanical significance for the effect on slope stability.