中文摘要：

土石混合体滑坡是我国山区最为常见的灾害之一，该类滑坡的变形与破坏往往受下覆相对稳定的基岩界面（基覆面）影响，基于此，为了研究不同形态基覆面对土石混合体变形破坏的影响，采用白行研制的大型推剪仪对不同形态的基覆面情况下的土石混合体变形破坏开展试验研究。研究结果表明：孔隙水压力变化值和土压力变化值随时间整体会呈现先上升后下降的变化趋势。由于土石混合体内部土石结构以及裂隙的不断变化，孔隙水压力变化值和土压力变化值会在最大值过后出现波动变化。当基覆面的形态为平直状时，滑裂面与基覆面的夹角最小，最大剪应力最大，孔隙水压力变化值与土压力变化值达到最大值所需要的时间最长。当基覆面的形态为台阶状时，滑裂面与基覆面的夹角最大，最大剪应力最小，孔隙水压力变化值与土压力变化值达到最大值所需要的时间最短。

英文摘要：

Soil-rock mixture landslide is one of the most common disasters types in the mountain. The deformation and failure of landslide are usually affected by the relatively stable bedrock interface, which is called as the bedrock surface. Based on it, the test is carried out through an in-house developed large shear test for studying the influence of the different shape bedrock surface on the stability of slope. The results show that the change value of the pore water pressure and earth pressure increase firstly and then decrease. Because of the internal soil-rock structure changes and fissure changes of soil ＆ rock mixture, the curve of the pore water pressure change value and earth pressure change value will fluctuate for some times after the maximum value. When the shape of bedrock surface is straight, the intersection angle between bedrock surface and sliding surface is smallest, the maximum shear stress is largest, it needs to take the longest time when pore water pressure change value and earth pressure change value reach the corresponding maximum value. When the shape of bedrock surface is stepped, the intersection angle between bedrock surface and sliding surface is largest, the maximum shear stress is smallest, it needs to take the shortest time when pore water pressure change value and earth pressure change value reach the corresponding maximum value.