层状边坡岩体结构稳定性位移判据

根据边坡岩体渐进性破坏机理,分析了层状边坡岩体结构屈曲和后屈曲的实际变形和整体破坏过程;以其地质背景及力学作用机制为依据,考虑边坡的材料、变形特点及结构特征,抽象出实际工程中常见的满足岩梁简化条件的各种力学模型.应用后屈曲能量准则,进一步研究结构分叉后平衡路径的演化途径,给出不同约束条件下以边坡上部滑动位移、剪切滑动的极限长度等为控制变量的边坡溃屈和剪切滑动的位移判据.研究表明:该判据真实反映了层状边坡岩体结构由分叉点后屈曲性态到极值点后屈曲性态转化的耦合过程,补充了已有的岩体结构稳定性位移判据理论,可使边坡位移理论的研究进一步工程化.

Displacement Criterion of Structure Stability for Rock Mass Bedding Slope

According to the mechanism of progressive failure for bedding rock slope, the post-buckling deformation and failure of structure rock mass were investigated. First, based on the geology background and its mechanical mechanism,the simplified engineering models of rock beam structures were extracted considering the materials, deformation and configuration features. Then, the regions nearby equilibrium bifurcation point and evolutions along equilibrium path were studied using post-buckling energy criterion, the buckling and the shearing slip displacement criteria were given in the form of the upper bound slipping displacement and the ultimate length with shearing slip under various restrictions. It is shown that the criterion reflects the coupling process from bifurcation point to extreme point post-buckling behavior of the structure rock mass. Further the criterion supplements the stability displacement criteria of the bedding rock slope and makes it more useful in engineering respect.