云南省彝良县麻窝后山滑坡变形破坏机理离心机模拟试验

Centrifuge simulation test on deformation mechanism of landslide in the Mawo Mountain in Yiliang County,Yunnan Province

结合具体滑坡进行大型土工离心机模型试验,研究滑坡在天然状态下的变形破坏特征及危害性,再现了滑坡坡体裂缝形成和破坏后的实际运动过程,并分析探讨了滑坡的变形破坏机制和危害范围。试验结果表明:滑坡的变形破坏模式为牵引式软弱基座型蠕滑-拉裂破坏;滑坡危害性特征显示,滑坡并未发生整体破坏,只是前缘的局部垮塌破坏,滑坡运动最远距离0.41m,还原到实际滑动距离为82m。同时由于土体力学参数的衰减,暂时未滑动坡体具有潜在危害性。

A large-scale geotechnical centrifuge model test was carried out,in which landslide deformation and failure characteristics and hazards in the natural state are examined. The formation and destruction of the crack and actual course of the campaign are reproduced and the deformation and failure mechanisms and hazards range of landslide are discussed and analyzed. The test results indicate that landslide deformation and failure mode is the type of towed weak base creep-tensile failure and landslide hazard characteristics are obvious.Landslide damaging does not occur as a whole,but a partial collapse at the leading edge of landslide occurs.The longest distance of landslide movement is 0. 41 m,restoring the actual sliding distance is 82 m. Due to the attenuation of soil physical parameters,the slope that has not slid is a potential geological disaster.