超载作用下土质边坡失稳与破坏模式分析

An analysis of instability and failure mode of soil slope under overloading action

影响边坡失稳的因素众多而且繁杂,超载作用是诱发土质边坡失稳的主要因素之一。基于强度折减有限元法对土质边坡进行了不同坡面超载作用下的稳定性计算,并分析了在坡面加载变化时边坡稳定性的变化规律及其潜在滑动面的失稳破坏形式。研究表明:坡面超载作用下土质边坡可能会触发边坡失稳破坏,坡面加载方式不同,边坡失稳破坏模式不同,破坏模式可能会由整体失稳转化为局部失稳。

There are many complex factors that affect the stability of slope,and the overloading effect is one of main factors which lead to the slope instability.Based on the strength reduction fi-nite element method,this paper carries out the stability calculation of soil slope under the action of slope surfaces of different kinds and analyzes the variant laws of slope stability in the slope sur-face loading changes and the instability failure mode in the potential sliding surface.The research results indicate that the soil slope is likely to trigger the slope instability failure under the action of slope surface overloads and that the different slope loading modes may have the different slope instability failure modes,and the failure modes are likely to make the whole instability convert in-to the local instability.