宜宾市某危岩稳定性计算及应用

Calculation of stability for unstable rock and application to the Yibin city

以宜宾市龙头山上山公路危岩体作为研究对象,按照出现频率,将作用在危岩体上的荷载拟定为三种荷载组合,根据失稳破坏的可能模式,分为滑塌式危岩、倾倒式危岩和坠落式危岩3类。基于极限平衡理论和岩体结构理论,建立了倾倒式危岩破坏模式下稳定系数的表达式。其结果表明:WY01危岩在天然状况下危岩稳定系数为1.43,属于基本稳定岩体,在饱和状态下和地震力作用下,属于欠稳定岩体,计算结果与实际情况大致相当。

Taking an unstable rock of Longtou mountain highway in Yibin city as a research object,in views of appearance frequency of loads acting on unstable rock,three types of load composites are designated.On the basis of failure mode,the unstable rock is divided into three models,i.e.unstable sliding rock,unstable fall rock and unstable topple rock.A mechanical model for analyzing the unstable fall rock was established on the basis of limit equilibrium theory and rock structure theory.The results showed that the stability coefficient of unstable sliding rock WY01 was 1.43 under natural conditions and under saturated conditions and seismic force.The calculation result was consistent with the actual situation.