Action law of geometrical characteristic parameters in the anti-dip rock slopes under different free face condition
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摘要: 层状反倾岩质边坡是一种常见边坡类型，其变形破坏模式多样、力学机制复杂、影响因素众多。为揭示层状反倾岩质边坡不同临空条件几何特征参数对反倾边坡倾倒变形影响规律，通过3DEC并结合数理统计系统深入研究几何特征参数对倾倒变形影响。研究表明：①反倾边坡具有3个临空面时边坡变形最大，1个临空面时边坡变形最小；②变形随边坡高度、切坡角度增大而增大，随节理面与临空面夹角的增大而减小，随岩层厚度增大先增大后减小；③2个临空面夹角90°时边坡变形最大；④1个、2个临空面时节理倾角60°时位移最大，3个临空面时随节理倾角增大而增大。Abstract: The anti-dumping layered rock slope is a common type of slope, which has various deformation and failure modes, complicated mechanics mechanism and many influencing factors.In order to reveal the influence law of the geometric characteristic parameters in different fronting surface conditions on the flexural toppling deformation of the reversed inclined layered rock slope, this study used 3DEC to research the influence law of geometric characteristic parameters on flexural toppling deformation, combined with mathematical statistics system.The obtained results show that: ① The maximum deformation displacement is found on three faces of the slope and the minimum on one face; ② The deformation displacement of slope increases with slope height, slope angle and joint inclination, and it decreases with the increase of the included angle between the joint surface and the free face; ③ The deformation displacement of the slope is the largest when the angle between the two free faces is 90°; ④ The deformation displacement is the largest when joint inclination angle is 60° on the one and two free faces, and it increases with the joint inclination angle increasing.
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Key words:
- anti-dumping layered rock slope /
- 3DEC /
- free face /
- geometry characteristic parameters
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图 1 数值模拟简化模型
θ.切坡角度; h.边坡高度; w.边坡宽度; φ.坡面夹角; ω.2个临空面夹角; d.岩层厚度; α.节理倾角; γ.节理面与临空面夹角
Figure 1. A simplified model for numerical simulation
图 2 不同临空条件反倾边坡破坏模式
Figure 2. Failure modes of anti-clinal slopes under different free faces conditions
图 3 某水电站右岸两临空面反倾边坡弯曲倾倒现象
Figure 3. Block-flexure toppling phenomenon of two free faces anti-dip slopes on right bank of hydropower station
图 4 某水电站右岸2#公路三临空面反倾边坡弯曲倾倒
Figure 4. Block-flexure toppling phenomenon of three free faces anti-dip slopes on 2# road of right bank of hydropower station
图 7 坡面夹角对边坡变形影响
Figure 7. Influence of angle between slope surfaces on slope deformation
图 8 节理面与临空面的夹角对边坡变形影响
Figure 8. Influence of included angle between the joint surface and the free face on slope deformation
图 10 两临空面夹角对边坡变形的影响
Figure 10. Influence of angle between two free surface on slope deformation
表 1 数值模拟选取参数
Table 1. Parameter selection of numerical stimulation
岩体参数 密度/(kg·m-3) 体积模量/GPa 剪切模量/GPa 黏聚力/MPa 内摩擦角/(°) 抗拉强度/MPa 岩体 2 600 2.1 1.14 5 45 0.7 结构面参数 法向刚度/(GPa·m-1) 剪切刚度/(GPa·m-1) 黏聚力/MPa 内摩擦角/(°) 结构面 5 6 0.09 30 
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