基于方向角修正的改进传递系数法

传递系数法假定条块作用力方向与上一条块底滑面平行。相关文献指出基于这样的假设可能导致计算结果偏大,偏于不安全。基于此,对条间作用力方向角进行修正:假定条间力方向角为上一条块底滑面倾角与未知常数λ(推力方向修正系数)的乘积,通过考虑边坡整体力矩平衡求解修正系数,进而求得边坡稳定系数,对传递系数法进行改进。通过经典算例及工程实例验算,结果表明,改进法计算结果较传统传递系数法更精确,物理过程更合理,能够满足工程精度要求。

IMPROVED TRANSFER COEFFICIENT METHOD BASED ON CORRECTING DIRECTION ANGLE

Transfer coefficient method assumes the inter-slice force direction parallels the slip surface of the upper slice.Correlative literatures shows the results based on the assumption may excessive and insecurity.Based on this,this paper amends the inter-slice force direction by introducing a correction coefficient.It assumes that direction angle of the inter-slice force equals to the product of correction coefficient and inclined angle of the upper-slice slip surface.The coefficient is acquired by considering moment equilibrium of overall landslip,and factor of stability is acquired further.Checking through the classic example and project example,results show that the result of improved method is more accurate than traditional transfer coefficient method＇s,and physical process is more reasonable.It can meet the engineering precision.