边坡稳定性计算中锚固力计入方式的讨论

分别采用Morgenstem-Price法和不平衡推力法计算在锚固力作用下边坡的稳定性，分3种方式计入锚固力的作用，即锚固力施加在锚杆的内端，位于条块的底部；锚固力施加在锚杆的外端，位于条块的顶部；锚固力均匀施加在锚杆穿越的条块内。研究表明，3种锚固力作用计入方式计算出的加固边坡安全系数相差在11％左右；而第3种锚固力计入方式的边坡安全系数介于第1和第2种方式的安全系数之间，且加固后的边坡条间力与滑面正应力分布最为合理。因此，建议在工程中采用第3种锚固力计入方式。

Discussion on the method of computing anchoring force in slope stability analysis

In this paper,the stability of anchored slope is computed by using the Morgenstern-Price method and the unbalanced thrust force method respectively.The action of anchoring force is computed in three ways:(1) the anchoring force is applied at the inner end of anchors,i.e.,at the slice base;(2) the anchoring force is applied at the outer end of anchors,i.e.,at the slice top;(3) the anchoring force is uniformly distributed along anchors which go across the slice.The results show that the difference in safety values among the three ways of considering anchoring force is not larger than 11%,and the safety factor of anchored slope computed by the third way falls between those of the other two ways.The inter-slice force distribution and normal stress distribution over the slip surface in the third way are most reasonable.Thus,the third way of considering the anchoring force action is recommended for practical use.