Mechanical analysis of apparent dip creep-buckling failure of Shanyang Super large-scale rockslide in Shaanxi Province
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摘要:
陕西山阳滑坡为典型的陡倾层状斜向岩质斜坡，其破坏模式不同于常见的顺倾层状岩质斜坡溃屈破坏模式，也不同于斜倾层状山体的视向滑移-剪切破坏模式，更不同于陡倾顺层岩质斜坡的倾倒、倾倒-滑移破坏模式，属于视向滑移-溃屈破坏模式。在实地调查的基础上，从斜坡结构特征、结构面组合特征以及剪出口特征分析了滑坡的破坏模式，进而分析了山阳滑坡的视向滑移-溃屈破坏机制；以梁板理论、层状板裂结构岩体弯曲-溃屈破坏的力学模型为基础，结合斜倾层状岩质滑坡的视向滑动机制研究，建立了基于斜坡自重、地下水静水压力、侧向摩阻力以及斜坡岩体厚度变化作用下的陡倾层状斜向岩质斜坡视向滑移-溃屈破坏力学模型，进行力学分析，推导了溃屈段长度条件方程，并以山阳滑坡为例验证了长度条件方程的正确性。
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关键词:
- 陡倾层状斜向岩质斜坡 /
- 视向滑移-溃屈破坏模式 /
- 破坏机制 /
- 侧向摩阻力 /
- 条件方程
Abstract:As a typical steep stratified oblique rock slope, Shanyang rockslide in Shaanxi Province is different from buckling failure of inclination-paralleled rockslide, apparent dip slide of inclined bedding rockslide and, what is more, toppling and sliding of steeply inclined rockslide, and belongs to the apparent dip creep-buckling. On the basis of field investigation and analysis of characteristics of structure planes, structure of sliding rockmass and shear outlet, the authors analyzed the failure mode in combination with the buckling mechanism. The authors established and analyzed the buckling mechanical model of steep stratified oblique rock slope under gravity, hydrostatic pressure of groundwater, lateral friction and rockmass depth of the rockslide according to the beam plate theory and mechanical model of bending-buckling failure of slab rent structure rockmass, as well as the condition equation of buckling length. The validity of the condition equation was verified.
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致谢: 在本文的撰写过程中，得到了殷跃平研究员的指导与建议，特表示衷心的感谢！
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图 2 硅质板岩表部富集的网状钙质胶结物
Figure 2. Reticulate calcareous cement on the surface of siliceous slate
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图 4 滑动山体三组结构面赤平投影
Figure 4. Three groups of joints stereographic projection in the slide rockmass
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图 7 剪出口右翼岩体弯曲隆起变形显著
Figure 7. Outstanding bending deformation of rockmass on the right of rockslide outlet
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图 8 剪出口左翼岩体张拉破坏特征显著
Figure 8. Outstanding tension deformation of rockmass on the left of rockslide outlet
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图 11 真倾角方向边坡微元受力分析
Figure 11. Force diagram of element of slope in the true angle direction
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