侵爆荷载作用下岩质边坡稳定性分析

STABILITY ANALYSIS OF ROCK SLOPES UNDER PENETRATION AND EXPLOSION LOAD

基于统一强度理论,考虑中间主应力效应和强度准则差异的影响,采用拟静力惯性力法、刚体极限平衡法和瑞典圆弧法,推导侵爆荷载作用下岩质边坡动力稳定系数的表达式,研究不同工况下岩质边坡的动力稳定性能,计算边坡滑体的最大滑裂高度及边坡失稳工况下单位宽度最大滑塌量,分析不同参数对边坡动力稳定系数的影响特性。研究表明:该计算式包含了一系列基于不同强度准则的静力稳定系数和动力稳定系数,可以有效地预测侵爆荷载作用下岩质边坡的动力稳定系数、最大滑体高度及单宽最大滑塌量的上限值和下限值,具有较广泛的适用性;考虑中间主应力效应越多或选用考虑中间主应力效应越多的强度准则,边坡的动力稳定系数越大;爆心深度越深或炸药量越大,边坡的动力稳定系数则越小。

Based on the unified strength theory,a formula of stability safety factor for rock slopes was deduced under the penetration and explosion load by pseudo-static method,rigid limiting equilibrium method and Swedish slip circle method. The proposed formula had considered influences of the intermediate principal stress and strength criteria.Accordingly,the dynamic stability was studied for rock slopes in different working conditions. Furthermore,the maximum height and the maximum sliding volume of slid mass were calculated,and the influence characteristics of different parameters on the stability safety factor were analyzed. The results showed that the proposed formula included a series of different criteria-based static stability safety factor and dynamic stability safety factor,which could predict effectively both upper limit and lower limit of the dynamic stability safety factor,the maximum height and the maximum sliding volume of rock slopes. The more the effect of intermediate principal stress,the higher the dynamic stability safety factor. While the deeper the explosion center,or the more the explosive charge,the lower the dynamic stability safety factor. The results in this article may provide theoretical reference for the stability evaluation and the emergence handling of slope engineering.