临界状态下滑坡稳定性分析方法研究  

Method of Analyzing Landslide Stability in Critical Condition

作　　者：柴海峰[1,2] 申月芳[1,2] 郭磊[1,2] 王国旭[1,2] 金鋆[1,2] 滑帅[1,2] 

机构地区：[1]中国地质大学岩土钻掘与防护教育部工程技术中心,武汉430074 [2]中国地质大学工程学院,武汉430074

出　　处：《长江科学院院报》2013年第5期70-75,91,共7页Journal of Changjiang River Scientific Research Institute

摘　　要：在条分法和极限平衡原理的基础上,将土体的抗剪强度与临界滑动面的倾角联系起来,建立临界公式。利用这一公式分析任意一点临界滑面的倾角随上覆压力变化的规律,验证了当斜坡体厚度小于一极限值时,坡面倾角在0～90°范围内斜坡都不会剪切破坏。另外,在此公式的基础上,建立2个思路,分别对2个滑坡案例的失稳原因进行分析,结果显示与监测资料一致,由此得出了2种方法下剩余下滑力的计算方法。在第2个案例中,分析了推力对斜坡临界状态的影响,并给出了计算公式。这种方法的优点在于对滑动面上的逐点进行了分析,能给出逐点的稳定状态,但是在计算上仍需改进和探讨。该种将岩土体的抗剪强度与临界滑动面倾角即将力学性质与几何形态联系起来进行的分析方法,可为评价坡体稳定性提供理论参考。On the basis of slice-dividing method and limiting equilibrium principle, a critical formula was set up by relating the shear strength of soil with the dip angle of critical landslide surface. The formula was employed to ana-lyze the variation of dip angle with overburden pressure. It＇ s verified that shear failure of the slope would not occur when the height of slope is less than a limit value with the slope angle in the range of 0-90°. In addition, two ideas were developed from the formula to analyze the causes of instability of two landslide cases. The results were consist-ent with monitoring data, and two methods of calculating the residual sliding force were given. In the second land-slide case, another formula which calculates the influence of thrust on slope＇ s critical state was also built. The ad-vantage of this method which relates the shear strength of soil with the critical dip angle of landslide surface is that the sliding surface is analyzed point by point, and the steady-state at each point is identified. But the method still needs to be improved and explored in calculation. The method which associates the mechanical properties with geo-metric shape provides new idea for the evaluation of slope stability.

关 键 词：抗剪强度 极限平衡 临界倾角 临界公式 推力 

分 类 号：P642.22[天文地球—工程地质学]