结构面参数对顺层边坡破坏模式的影响规律

Study on Influence Laws of Rock Structural Plane Parameters on Failure Mode of Bedding Slope

基于岩质顺层边坡的离散元仿真模型,研究了结构面各参数(黏聚力、内摩擦角、刚度、倾角、间距)对边坡稳定性的影响,明确了其对边坡安全系数及破坏模式的影响规律。采用正交试验的极差分析原理,探讨了各结构面参数对边坡稳定性影响的显著程度,明确了结构面各因素对边坡安全系数影响的显著顺序。研究表明,随着结构面强度的增大,边坡安全系数在一定范围内呈线性增长,且边坡的破坏模式从顺层滑移逐渐转变为滑移-弯曲破坏模式;随着结构面刚度和结构面间距的增加安全系数变化幅度很小,其最大变化率仅为6.6%和3.6%,边坡破坏模式主要为滑移式破坏。随着结构面倾角的增大边坡安全系数表现为减小—增大—减小的趋势,破坏模式由滑移式破坏变为滑移-溃曲破坏最后变为倾倒破坏;结构面黏聚力对边坡稳定性影响最大,结构面刚度影响最小。

Based on the discrete element numerical simulation of rock slope,influences of the parameters（ cohesion,internal friction angle,rigidity,dip angle,spacing） of rock structural plane to slope stability is studied to clear the influencing law for safety factor and failure modes of slope. According to the principle of variance analysis of orthogonal experiment,the significance that rock structural plane parameters impact on the slope stability is discussed. It is shown that slope safety factor is on linear growth in a certain range with strength of the rock structural plane increasing,and the failure modes shift gradually from the bedding sliding failure modes to the sliding-bending failure modes. The safety factors changes very little with the rigidity and spacing of rock structural plane increasing. Its maximum variance ratio is only 6. 6% and 3. 6%,and the slope failure modes are mainly sliding failure modes. Slope safety factor firstly decreases,then increases and finally decreases with the increase of the rock structural plane dip angle,and failure modes shift from shearing slip failure modes to shearing slip-buckling failure modes,finally to the tilting failure modes. The impact of the rock structural plane cohesion on the slope stability is the greatest,and the rigidity is the least.