振动对松软含煤夹层顺层边坡稳定性影响的模型研究

Model experimental study of the effect of vibration on the soft coal sandwich bedding slope Stability

露天煤矿开采形成的采坑松软含煤夹层顺层边坡的稳定性研究是治理边坡提高煤采率的基础,本研究将处于静态平衡状态的松软含煤夹层顺层岩体边坡在振动作用下的滑移失稳问题视为层面抗剪强度指标(φ、c)弱化造成的.通过振动模型实验研究发现,在层面强度及振动频率一定时,随着振动速度的增加,松软含煤夹层等效动内摩擦角和等效动粘聚力弱化值逐渐增大,且它们与振动速度成幂函数关系;利用等效内摩擦角、弱化值及岩层倾角关系可判断振动作用下煤矿采坑松软含煤夹层面性质的顺层边坡的动稳定性.

The laminated soft coal bedding slope stability study is the basis of governing slope and improving the rate of coal mining.The problem of slip instability of laminated soft coal bedding slope caused by vibration can be regarded as the weakening of strength level indicators（,c）.Vibration test analysis finds that when the level of intensity and frequency is constant,with the vibration velocity increases,the soft coal laminated bedding slope equivalent dynamic internal friction angle and the weakening of the value of equivalent dynamic cohesive force will gradually increase.Between them and the vibration velocity is power function relationship.Using their relationship,we determine the soft coal under the action of vibration levels folder bedding dynamic stability of the slope.