缓倾角层状高边坡变形破坏机制物理模拟研究

针对某高速公路缓倾角顺层岩质高边坡滑坡,为了研究其变形破坏机制,尤其是岩层缓倾坡内和缓倾坡外两种情况下的异同,通过野外实际调查和论证,在对该滑坡形态、结构及变形破坏特征进行详细研究的基础上,选取其主剖面,并恢复其滑动破坏前的近似坡面情形,利用物理模拟研究方法中的底摩擦试验,分岩层缓倾坡外和缓倾坡内两种情况,再现了该边坡变形破坏的全过程,并对不同阶段的变形及最终破坏机制进行了深入分析。认为岩层缓倾坡外时边坡属滑移—压致拉裂型破坏,层间错动明显;岩层缓倾坡内时边坡基本处于稳定状态,无明显层间错动。

Study of mechanism of deformation failure of a low-angle bedded high slope with physical simulation method

Aimed at a low-angle bedded high rock landslide of a speedway,in order to study on its deformation and failure mechanism,especially to find their similarities and differences of two kinds of low-angle rock stratum,which trends outside or inside slope,according to on the spot investigation and argumentation,deformation and failure,and so on,and on the basis of renewing the initial sloping surface of slope,authors reappear the whole process of deformation failure on the two conditions by choosing the main section of the slope and using the experiment of basal contact friction in physical simulation methods,thoroughly analyze the deformation of different phases and the final failure mechanism,and eventually confirm that the failure of slope,which rock stratum dips outside,is ascribed to sliding-compression cracking and its interlaminar sliding is remarkable;and the slope,which rock stratum dips inside,on the whole is in the stabilized state and has no obvious phenomenon of interlaminar sliding.