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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,采用自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。
Earth-rock mixed landslide is one of the most common disasters in mountainous areas of our country. The deformation and failure of such landslides are often influenced by the relatively stable bedrock interface (basement overlay) under the overburden. Based on this, in order to study the effects of different forms of overburden on soil- Deformation and destruction of the impact of the use of large-scale self-developed clipper on the different forms of foundation under the conditions of soil-rock mixture deformation and failure to carry out experimental study. The results show that the changes of pore water pressure and soil pressure change first and then decrease with time. Due to the change of soil and rock structure and cracks in the soil-rock mixture, the variation of pore water pressure and earth pressure will fluctuate after the maximum value. When the shape of the foundation cladding is straight, the angle between the slip surface and the foundation cladding is the smallest, and the maximum shear stress is the largest. The time required for the pore water pressure and soil pressure to reach the maximum value is the longest. When the shape of the base cladding is step-like, the angle between the slip surface and the base cladding is the largest, and the maximum shear stress is the smallest. The time required for the change of pore water pressure and earth pressure to reach the maximum value is the shortest.