非饱和黄土边坡稳定性分析及影响参数研究综述

Analysis of Unsaturated Loess Slope Stability and Review of its Influencing Parameters

对现有非饱和黄土边坡稳定性分析的研究现状、理论基础、分析方法、破坏机制等进行总结,针对现有数值分析方法,对影响非饱和黄土边坡稳定性的参数进行归纳。总结得出在进行非饱和黄土边坡破坏机制研究时,将宏、微观试验结果结合具体边坡剖面监测数据,进行边坡破坏机制及非饱和土抗剪强度理论的研究;在采用数值方法分析黄土边坡稳定性时必须考虑孔隙水压力的变化及可能由于湿陷导致的体积变形,通过试验或反演分析确定合理的抗剪强度参数,从理论上清楚各参数如何影响边坡的稳定性;并且在有条件的情况下从微观层面探讨非饱和边坡中土骨架变形特征,从而系统地完成边坡稳定性分析。在未来非饱和黄土边坡稳定性分析研究中,仍需以非饱和土力学为基础,紧密结合岩土工程与地质工程其他学科,进行交叉研究分析,从宏观到微观、由表及内总结非饱和黄土变形机制。如果条件允许在勘察过程中便可以采取数值模拟方式对现有坡体进行稳定性分析及变形模拟,并分析其主要影响因素,进行提前预防控制。

In this paper,we summarized the research status,theoretical basis,analysis method,and failure mechanism of the analysis on existing unsaturated loess slope stability.Then,we summarize the parameters affecting the stability of unsaturated loess slope by using the existing numerical analysis methods.It is concluded that when studying the failure mechanism of unsaturated loess slopes,we should combine the macroscopic and microscopic test results with the specific slope profile monitoring data to study the slope failure mechanism and the theory of unsaturated soil shear strength.When using the numerical method to analyze the stability of loess slope,we should take the change of pore water pressure and the volume deformation caused by collapsibility into consideration,and determine the reasonable shear strength parameters through test or inversion analysis,and get a clear knowledge of how each parameter affects the stability of slope in theory.Furthermore,the deformation characteristics of soil skeleton in unsaturated slopes are discussed on a micro level under suitable conditions so as to systematically complete the slope stability analysis.In the future,when studying the unsaturated loess slope stability,we should take the unsaturated soil mechanics as the basis,and conduct cross research and analysis combined with the geotechnical engineering and geological engineering etc.,to summarize the deformation mechanism of unsaturated loess in a way proceeding from the macroscopic to the microscopic,and from the exterior to the interior.If conditions permit,the numerical simulation mode can be adopted to analyze the stability and simulate the deformation of the existing slopes in the process of investigation,and the main influencing factors are analyzed for preventive control,which is of great theoretical and practical significance for the prevention and reduction of loess disasters.