论文部分内容阅读
提出一种计算岩质边坡爆破开挖情况下边坡安全系数的节点拟静力法。通过节点拟静力法可确定爆破荷载作用下边坡潜在滑动面的位置、破坏模式以及安全系数。节点拟静力法的基本思路包括3个部分:首先,基于二维离散元计算软件UDEC4.0内嵌的程序语言FISH,对UDEC4.0进行二次开发,编写考虑爆破振动峰值加速度随爆心距和高差衰减规律的计算程序;其次,基于强度折减法的基本原理,编写强度折减计算程序;最后,坡体临界状态判别方法的选择,提出用最大节点位移历时曲线来判断坡体的临界状态的新的边坡失稳判据。同时与UDEC自带程序的计算结果相比较,证明节点拟静力法的正确性和可行性,最后把节点拟静力法应用于云浮硫铁矿露天采场边坡的爆破设计和稳定性评价。
A pseudo-static method is proposed to calculate the safety factor of slope under rock excavation. Pseudo-static method can be used to determine the position, failure mode and safety factor of potential sliding surface under the action of blasting load. The basic idea of node quasi-static method includes three parts: Firstly, based on the two-dimensional discrete element software UDEC4.0 embedded programming language FISH, the second development of UDEC4.0, Finally, the selection of the method of critical state identification of slope body, it is proposed to determine the critical value of the slope by using the curve of the maximum node displacement time-lapse New slope instability criterion of state. At the same time, compared with the results of UDEC self-contained program, the correctness and feasibility of quasi-static method are proved. Finally, the quasi-static method is applied to the blasting design and stability evaluation of the open pit slope in Yunfu Pyrite Mine .