一种新的节理本构模型及几种新的滑坡稳定系数计算方法

A NEW JOINT CONSTITUTIVE MODEL AND SEVERAL NEW METHODS OF STABILITY COEFFICIENT CALCULATION OF LANDSLIDES

在对滑坡渐进变形分析的基础上,提出一种新的节理本构模型,推理出本构模型参数的决定方法;分析临界状态应力特征,提出临界状态应变方程,将提出的本构理论和现行莫尔–库仑临界状态准则实现无缝连接。分析现行滑坡稳定性系数计算方法的优缺点,相应地提出滑坡稳定性系数几种新的计算方法:基于渐进变形的临界状态稳定性系数计算方法、部分条块强度折减稳定性系数计算方法、综合下滑力–摩阻力稳定性系数计算方法、最大主下滑力滑坡稳定性系数计算方法,以及每一条块滑坡稳定性系数计算方法。对传统滑坡稳定性系数计算方法和本文提出的方法进行对比分析,进而提出综合下滑力–摩阻力稳定性系数以及最大主下滑力稳定性系数计算方法较能反应工程实践。最后,以实例对所提出的计算模型进行对比分析。

A new joint constitutive model is proposed and its relating parameters are calibrated based on analyzing progressed deformation of landslide. The strain space state equation is proposed by use of critical stress characteristics; the relationship between Mohr-Coulomb criterion and the proposed critical strain state equation is established. The advantage and shortage are analyzed for the conventional calculation of stability coefficient of landslides; several new calculating methods of safety factor of landslides are proposed, such as： stability factor calculation based on progressive deformation, stability factor calculation by strength deduction for part sliding block, the calculating method of comprehensive sliding force and resistance force of landslide, the stability coefficient calculation of maximum main sliding force of landslide, and stability factor calculation for each sliding block of landslide. The stability coefficient of the comprehensive sliding-resistance force and the maximum main stress are fit for describing the landslide state. The new joint constitutive model and calculating methods of landslide are useful for describing the landslide state.