边坡稳定性分析的条块稳定系数法

鉴于传统条分法对边坡安全系数定义和使用的局限性，引入了条块稳定系数的概念。分析了条间力推力线高度的影响因素，假定条间力传递时都具有相同的条间力稳定系数 ，并考虑了条块重力偏心矩的影响。根据条块的力和力矩平衡关系以及条间力假定，建立了求解条块稳定系数的四元方程组。在此基础上，求得条块稳定系数随滑动面的分布状况。根据条块稳定系数随滑动面的分布规律划分了滑体的主滑段、抗滑段和牵引段，大致判断滑坡的滑动模式。根据滑面上抗滑力和下滑力之比的定义，求解边坡整体稳定系数。采用传统条分法和所建立的条块分析法分别以圆弧滑动和折线形滑动的两个实例进行了验算，说明了条块分析法的优越性和可靠性。

A slice-stability method for stability analysis of slopes

The concept of coefficient of slice stability is proposed for the limitation of the definition of factor of safety in traditional slice method. Some effect factors are analysed to the height of thrust line, an assumption is advanced that the stability coefficient of inter-slice forces is equal to the same value , and the eccentric moment of slice weight should be considered in the analysis; the four variables equations are established based on the balance of forces and moment and the assumption of inter-slice forces; then the stability coefficient of every slice and its distribution along the slip surface can be obtained. According to the distribution of slice stability coefficient along the slip surface the slip mass can be divided into main slide sector and trailed sector and anti-slide sector; and then the sliding model of the slope can be judged; the factor of safety of the slope stability is also defined by the ratio of the sum of anti-sliding force to the sum of sliding force on the slip surface. Two examples are analysed by the traditional slice method and the slice-stability method; the result shows that the slice-stability method is more reliable.