弯曲倾倒模式下薄层状反倾岩质边坡锚固力研究

Research on anchorage force of a thin layered anti-dip rock slope under bending and toppling mode

基于悬臂梁理论建立锚固力解析计算模型,以某薄层状反倾岩质边坡为实例,进行锚固力计算及相关参数敏感性分析,并以数值模拟加以对比分析。研究结果表明:此类边坡锚固力计算可划分为倾倒锚固区和滑动锚固区,其中倾倒锚固区折断深度和锚固力都随坡顶距增大而减小,且最大折断深度和最大锚固力对相关参数敏感性由大到小依次为:层厚、抗拉强度、层间内摩擦角。数值模拟中锚索轴力增量比随坡顶距增大而减小,与解析计算结果变化规律一致,且加固倾倒锚固区比加固滑动锚固区对于控制边坡水平位移效果更加明显。

Based on the cantilever beam theory,an analytical model for calculating the anchorage force was proposed.A thin layered anti-dip rock slope was set as an example.The anchorage force was computed and the related parameter sensitivity was analyzed.The anchorage force yielded from the analytical model was compared with that of numerical simulation.The results show that there are toppling zone and sliding zone in the anchorage force calculation of this type of slope.With the increasing distance from the top of the slope in the toppling anchorage zone,the broken depth and anchorage force decrease.Their sensitivities to related parameters are shown as follows in descending order:layer thickness,tensile strength,internal friction angle.On the other hand,the anchorage forces produced from numerical simulation are consistent with the results of the analytical simulation.In terms of controlling the horizontal displacement of this slope,it would be better to anchor in toppling zone than doing it in sliding zone.