为保障深井矿山安全高效开采,以某铜矿为例,提出了一种基于节理裂隙的采场结构参数优化方法.首先,综合工程地质背景和Mathews稳定图法,实现采场结构参数初选;其次,借助COMSOL软件构建采场周围结构面的三维离散裂隙网络,通过与采场开挖模型耦合,重构结构面影响下的采场三维模型;然后,采用FLAC3D 数值模拟计算,确定不同采场结构参数方案的安全性指标;最后,运用多目标理想点法综合决策,获得最优采场结构参数方案.研究结果表明:结构面组成的裂隙网络会降低采场的稳定性,二步骤矿柱回采的采场稳定性远弱于一步骤矿房回采;采场宽度是影响采场稳定性的关键因素,采场宽度与开挖后产生的最大位移和最大拉(压)应力呈正相关,与安全率呈负相关;采场结构参数也受采场形状影响,确定的采场面积存在对应的最优采场结构参数.综合考虑经济因素得到的最优采场结构参数为采场宽度 10 m,采场高度 15 m.
Stope Structure Parameter Optimization Based on Three-dimensional Discrete Fracture Network
In order to ensure the safe and efficient mining of deep mine,taking a copper mine as an example,a method for optimizing stope structure parameters based on joint fissures is proposed.Firstly,based on engineering geological back-ground and Mathews stability diagram method,the selection of stope structural parameters is realized.Secondly,the three-di-mensional discrete fracture network of the structural plane around the stope is constructed by COMSOL software,and the three-dimensional stope model under the influence of the structural plane is reconstructed by coupling with the stope excavation mod-el.Then,FLAC3D numerical simulation is used to determine the safety indexes of different stope structural parameter schemes.Finally,the optimal stope structure parameter scheme is obtained by using multi-objective ideal point method.The results show that the fracture network composed of structural plane will reduce the stability of stope,and the stope stability of two-step pillar mining is much weaker than that of one-step chamber mining.Stope width is the key factor affecting the stability of stope,stope width is positively correlated with the maximum displacement and maximum tensile(compressive)stress after excavation,and negatively correlated with the safety rate.The stope structure parameters are also affected by the shape of the stope,and the de-termined stope area has the corresponding optimal stope structure parameters.Considering the economic factors comprehensive-ly,the optimal stope structure parameters are 10 m width and 15 m height.
stope structural parametersjointdiscrete fracture networknumerical simulationideal point method
万方数据
维普
