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块石凸体的咬合作用是保证滑面贯通型坡体稳定的核心屏障,但其强度机理和解锁模式还不清晰。为此,以岩石力学为基础,通过合理建模分析了咬合失稳模式。继而,借助古典摩擦定律和极限分析理论,分别从接触和能量角度阐明了凸体在滑跃和剪断两类不同模式下解锁的条件和机理,解析了不同荷载环境下凸体咬合强度的表达。最后,算例分析表明:1)下滑力T与上覆荷载P的绝对值及相对值决定了咬合凸体的稳定状态和破坏模式。当T/P较大且大于临界值ξ后咬合凸体滑跃解锁,反之当T/P较小但T却够大时凸体剪断解锁,否则保持稳定;2)滑跃解锁是凸体几何形状和荷载环境满足条件下咬合面滑动摩擦的结果,而剪断解锁则是外力功沿潜在破坏面耗散的过程;3)滑面凸体咬合强度是不同荷载环境下凸体以不同模式失稳的临界力学条件的综合反映。
The bite behavior of the block stone convex body is the core barrier to ensure the stability of the sliding surface through the slope, but the strength mechanism and the unlock mode are still not clear. Therefore, on the basis of rock mechanics, the mode of bite instability was analyzed through reasonable modeling. Then, with the aid of the classical friction law and the limit analysis theory, the conditions and mechanism of the unlocking of the convex body in two different modes of sliding and shearing are explained respectively from the perspective of contact and energy, and the expression of the convexing body bite strength under different loading environments is analyzed. Finally, the case study shows that: 1) The absolute value and the relative value of the sliding force T and the overlying load P determine the steady state and failure mode of the bite convex. When the T / P is larger and larger than the critical value ξ, the snap-in protrusion slides and unlocks. On the contrary, when the T / P is small but the T is big enough, the protrusion is sheared and unlocked; otherwise, the stability remains stable. Shape and load environment to meet the conditions of the occlusal surface sliding friction results, while the shear is the external force work along the potential damage surface dissipation process; 3) slip surface convex body bite strength under different load conditions convex body in different modes of instability A comprehensive reflection of the critical mechanics conditions.