考虑多级采动效应的边坡失稳过程研究

应用RFPA强度有限元软件建立连续开挖模型和一次开挖模型，对比不同开挖模式下多级边坡损伤机理和损伤过程，分析多级边坡多次采动过程中局部化岩体损伤、破坏、失稳过程，再现了多次采动影响下多级边坡局部失稳效应。结合金川集团石英石露天矿多级边坡现场监测数据进行分析，在强度折减的过程中引入连续采动，实现真正意义上的强度折减和采动效应，使得数值模拟破坏机理和破坏过程与实际破坏过程更为接近。主要表现在一次开挖和连续开挖只是在时间步骤、空间位置、多级边坡结构稳定性分析上不同，其损伤过程、损伤机理基本保持一致。多级边坡连续开采在时间、空间效应的影响下主要以局部失稳破坏为主。

Study on Slope Instability Process under the Effect of Multistage Mining Activities

RFPA strength finite element software is applied to establish continuous excavation model and once excavation model，and make contrast on the damage mechanism and process of multistage slope under different excavation mode.It is analyzed that local instability effect of multistage slope appears under multiple mining disturbance，by analyzing the local rock mass damage，destruction，instability during the multiple mining activities，and combining with the field monitoring data of quartz stone mine in Jinchuan open pit.In the process of the strength reduction，the continuous mining is introduced to realize the real strength reduction and mining effect，which makes the numerical simulation of the failure mechanism and process more close to the actual damage process.It is mainly shown that：the once excavation and continuous excavation are only different at the time，space position，and the stability analysis of multi-stage slope structure.Their damage process and mechanism basically keep consistent.Under the influence of the time and space effect，the continuous mining of multistage slope mainly show as the local instability and failure.