焦家崖头北部13号滑坡变形破坏演化机制

Research on the evolution mechanism of deformation and failure of No.13 landslide in the north of Jiaojiayatou

为进一步研究灌溉作用下滑坡变形破坏机理,评价此类滑坡的稳定性,以甘肃黑方台焦家崖头北部13号滑坡为例,通过野外地质调查,分析其变形破坏特征。在此基础上,基于FLAC3D数值模拟方法分析一定水位下其变形破坏特征,进而概化滑坡变形演化规律。研究结果表明,在灌溉的条件下,该滑坡早期滑动主要为潜蚀-滑移型滑坡,滑动后的再次滑动为塑流-拉裂型滑坡,随着坡体滑移变形的持续和裂隙的进一步扩展,表现出"压制拉裂-剪切破坏"的滑动机理。

In order to investigate deformation and failure of landslide under irrigation and evaluate the stability of the landslide, the authors took No.13 landslide at northern Jiaojiayatou of Heifangtai area in Gansu Province as a study case and performed field geological survey to analyze its characteristics of deformation and failure. On such a basis, the authors employed FLAC3D numerical simulation method to analyze the characteristics of deformation and failure under the constant water level, and then generalized the evolution law of landslide deformation. The results show that, under the condition of irrigation, early sliding of the landslide is mainly characterized by suffosion and sliding landslide, then the sliding landslide exhibits plastic flow and tension crack landslide and, with the further expansion of the slope and crack, the landslide shows a sliding mechanism of ＂pressing crack-shear failure＂.