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首先分析鸡尾山斜倾厚层岩质滑坡视向滑动的成因机制,对前期的滑坡物理模型进行优化;开展土工离模型试验,重现滑坡失稳过程;研究斜倾厚层岩质滑坡视向滑动的变形破坏特征,对斜倾厚层岩质滑坡视向滑动的“后部块体驱动–前缘关键块体瞬时失稳”的破坏模式进行验证。试验结果显示,滑坡模型在73 g时发生破坏,与前期80 g破坏的试验具有较好的重复性,节理化的滑坡模型与岩体结构完整的滑坡模型相比,更易于发生变形破坏;内侧滑块大部分残留堆积在滑动面上,外侧滑块视向滑动、高位剪出。随着离心加速度的增大,模型后部块体首先出现蠕滑现象,前缘块体阻滑作用明显;当加速度达到73 g时,前缘块体被突然视向挤出,诱发后部块体沿滑面产生滑移;滑坡的初始变形破坏过程是由渐进破坏向瞬时破坏转变的过程,经历蠕滑变形–节理张拉–滑面滑动–前缘撞击–视向偏转–高位剪出–碰撞解体–静止堆积。
First of all, the paper analyzes the genesis mechanism of the sight-slip of rock slope in thick slope of Jiaowei Mountain, optimizes the previous landslide physical model, carries out geotechnical model test to reproduce the process of landslide instability, And the deformation and failure characteristics of the landslide. The failure modes of the “rear block-driven-instantaneous instability of the key block in the leading edge” of the sight-slip sliding landslides are verified. The test results show that the landslide model is destroyed at 73 g, which is more repeatable than the previous experiment at 80 g. The joint landslide model is more prone to deformation and failure than the complete landslide model with rock mass structure. The medial Most of the residual slider piled up on the sliding surface, the outer slider sliding as the high cut out. With the increase of centrifugal acceleration, creep slip firstly appears in the block at the rear of the model, and the blocking resistance of the leading edge block is obvious. When the acceleration reaches 73 g, the leading block is suddenly visualized and extruded, The body slides along the sliding surface; the initial deformation and failure process of the landslide is the process of the transformation from progressive failure to instantaneous failure, the creeping deformation - the joint tensioning - the sliding of the sliding surface - the frontal impact - the viewing direction deflection - Crash disintegration - still accumulation.