变分法用于滑坡反分析的几个问题

SBVERAL PROBLEMS ON BACKANALYSIS OF LANDSLIDE WITH A VARIATIONAL METHOD

本文探讨了变分法在确定边坡极限高度时存在的某些问题。绘制了坡角，裂缝位置，极限高度与值的关系曲线。根据所得结论可直接确定极限高度，并用于滑坡的反分析，还易于反算Ｃ，值。用所得结果与文献中的实例作了对比，并对甘肃洒勒山滑坡进行了反分析。

The shape,position and stress distribution on the sliding surface can be rationallydetermined by a variational method.And the method satisfies the equilibrium,yield condition and thetransversal conditions for the unknown position to determine the critieal height of a slope when theslope angles and the material parameter C and are known.This paper corrects some ertors existingin the current literature and presents two curves to facilitate deterimination of the critical height andthe cracking position appearing on the top surface of the slope.These curves are particallarly suitedto backanalysis of landslide when the cracking position,the originally slope angle and the failuredslope height are known or can be estimated.Finally,calculated examples are cornpared with currentliterature.