一种基于滑动带的土坡稳定分析方法研究

实际土坡发生失稳破坏时通常沿滑动带(剪切带)进行,而目前进行土坡稳定分析的方法几乎均仅考虑滑动面,这与实际有一定差别。为更符合滑坡的实际特点,提出了一种基于滑动带的土坡稳定分析新方法。该方法以黏性土坡为研究对象,基于土坡稳定分析的极限平衡条分法,认为土体沿滑动带发生的失稳破坏是以最危险滑动面为基础,多个非最危险滑动面共同作用的结果,通过模拟滑动带并筛选满足特定要求的滑动面,对其安全系数进行加权处理,计算最终安全系数。通过几个算例对新方法进行了验证,研究表明:新方法的计算结果较基于滑动面的Morgenstern-Price法结果、基于滑动面的Bishop法结果及有限元法结果偏小,偏于保守,新方法有一定合理性,可为以后的研究提供参考。

Stability Analysis Method of Soil Slope Based on Sliding Zone

The failure of a soil slope usually occurs along the sliding zone (shearing zone) ,but most of the slope stability analysis methods are based on the sliding surface ,which is different from the actual situation .In order to accord with the actual characteristics of landslide ,a new method is proposed to analyze the stability of soil slope based on sliding zone . Using the clay soil slope based on the traditional limit equilibrium methods ,this paper considered that the failure of a soil slope along the sliding zone is based on the most dangerous sliding surface and influenced by a plurality of non -most dan-gerous sliding surfaces .Then by simulating the sliding zone and selecting the sliding surfaces which satisfy the specific requirements ,the final factor of safety is calculated by weighting the factors of safety of the selected sliding surfaces .The new method is verified by several examples .The results show that the value from new method is smaller than that of the Morgenstern-Price method and the Bishop method based on the sliding surface ,and also smaller than that of the finite el-ement method ,so the result is more conservative .Therefore the new method is reasonable and can provide a reference for future research .