回采巷道支护参数优化及数值分析

基于围岩力学性质进行回采巷道支护参数优化,可以在保证围岩稳定的基础上节约支护成本。为解决回采巷道支护设计因采用工程类比法而导致支护材料浪费等问题,以某矿8302皮带顺槽为研究背景,基于其坚硬顶板特性,选用悬吊理论进行支护优化设计,以锚杆及锚索间排距为优化因素,设计了3种优化方案及支护参数。利用FLAC~(3D)数值模拟软件对各支护方案的应力场、位移场及塑性区分布进行模拟研究,分析得出优化方案2对控制围岩稳定最有利。现场监测表明,优化方案2可有效控制巷道围岩体失稳破坏,该研究可为同类巷道的支护优化提供借鉴。

Optimization and numerical analysis of mining roadway support parameters

The optimization of mining roadway support parameters, based on the surrounding rock mechanical properties, can ensure the stability of surrounding rock and save the cost of support. In order to solve the supporting problem of the roadway support design lead by adopt engineering analogy method, this paper chose the suspension theory to optimize the design of support and designed three optimization schemes under the research background of the 8302 crossheading condition of a coalmine, based on its characteristics of hard roof and with the optimization factors of row spacing between bolt and anchor cable. The FLAC3D numerical simulation software was used for the simulation study of the stress field, displacement field and plastic zone, the research proved that the second optimization parameters is most favorable to the stability of surrounding rock of the roadway. Field monitoring shows that the second scheme can effectively control the stability of surrounding rock, which can provide a reference for the optimization of roadway support.