雅砻江上游互层斜坡倾倒变形破坏机制与演化

发布时间：2018-11-22 15:15

【摘要】：以甲西倾倒体为典型实例,从赋存环境、发育特征、形成条件等基础层面上分析雅砻江上游互层斜坡倾倒变形破坏机制及演化过程。研究表明:区内大型倾倒体是斜坡岩体在叠加有残余构造应力的自重应力场中长期演化的产物,软硬相间的岩性组合、陡倾内的岸坡结构,加之垂直层面密集节理的切割是斜坡发生倾倒变形的控制性因素;斜坡倾倒是受节理面和层面控制的复合倾倒模式,即:硬岩发生块状-弯曲倾倒,而软岩发生弯曲倾倒;受河谷演化控制,斜坡变形破坏主要经历了4个演化阶段:卸荷回弹陡倾面拉裂阶段,初始变形阶段,板梁根部折断、剪切面贯通阶段以及破坏阶段,并最终转化为蠕滑-拉裂模式形成滑坡。该滑动面受倾向坡外破裂面控制,而并非沿最大弯折带发育。
[Abstract]:Taking Jiaxi dumping body as a typical example, the mechanism and evolution process of toppling deformation and failure of interbedded slopes in the upper reaches of Yalong River are analyzed from the basic aspects of occurrence environment, developmental characteristics and formation conditions. The study shows that the large toppling in the region is the result of the long-term evolution of the gravity stress field of the slope rock mass superimposed with residual structural stress, the lithologic combination of soft and hard phases, and the slope structure in the steep dip. In addition, the cutting of vertical plane dense joints is the controlling factor of slope toppling deformation. Slope toppling is a composite dumping model controlled by joint surface and plane, that is, hard rock collapses in block-bend and soft rock collapses in bending; Controlled by the valley evolution, the slope deformation and failure mainly experienced four evolution stages: unloading, springback, steep dip, initial deformation, plate beam root fracture, shear plane through, and failure stage. And finally transformed into creep-tension mode to form a landslide. The slip surface is controlled by the fracture surface outside the inclined slope and is not developed along the maximum bending zone.
【作者单位】：中国地质大学(武汉)工程学院;
【基金】：国家自然科学基金重点项目(41230637) 中国博士后科学基金(2016M592411)资助
【分类号】：P642.22

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