有别于平面滑动与圆弧滑动,具有复合底滑界面的滑坡体在滑移过程中,滑体各部位滑移方向因必须适应底滑界面的倾角而各不相同。滑体经过底滑界面转折部位时其滑移方向会产生突变,这种突变诱导滑体内部产生剪切破裂面,滑体内部的抗剪阻力则阻碍这种剪切破裂面的形成,从而有利于滑体的整体稳定。针对前缓后陡的复合滑动边坡,提出了考虑滑体内部剪切破裂面的三滑面刚体极限平衡分析方法,从而反映滑体内部抗剪阻力对边坡稳定的约束机制。以Vajont滑坡为例进行了详尽的案例分析,结果表明,复合滑坡体存在客观的内部剪切约束机制,三滑面刚体极限平衡分析可以充分反映这种机制,该方法可为具有复合底滑界面的边坡稳定性分析提供新的思路和方法。
Abstract
Different from plane sliding and circular sliding, the sliding direction of landslide with composite bottom sliding interface varies because the sliding direction must adapt to the dip angle of the bottom sliding interface. When the sliding mass passes through the turning part of the bottom sliding interface, the sliding direction changes abruptly. Such abrupt change induces the shear fracture surface in the sliding mass; but the shear resistance in the sliding mass hinders the formation of such shear fracture surface, which is beneficial to the overall stability of the sliding mass. For composite sliding slope with gentle front and steep back, a rigid body limit equilibrium analysis method with three sliding planes considering the internal shear fracture surface of sliding mass is proposed to reflect the constraint mechanism of internal shear resistance on slope stability. A detailed case analysis on Vajont landslide is presented. Results reveal an objective internal shear constraint mechanism in the composite landslide as reflected by the rigid body limit equilibrium analysis of three sliding surfaces.
关键词
边坡稳定性 /
复合底滑界面 /
滑体内部剪切破裂 /
三滑面 /
刚体极限平衡
Key words
slope stability /
composite bottom sliding interface /
internal shear fracture of sliding mass /
three slip surfaces /
rigid body limit equilibrium
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基金
国家重点研发计划项目(2018YFC0407002);国家自然科学基金项目(51927815,51879014,12072047);中央级公益性科研院所基本科研业务费项目(CKSF2019434)
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