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为实现采矿巷道周边节理网络的仿真模拟以及节理岩体中巷道的稳定性分析,构建了包含颗粒流块体模型、原生节理网络和次生节理网络的仿真节理岩体模型。针对岩体内部次生节理产状和面积不可准确测量的难题,提出了卸荷作用下次生节理产状和面积的计算方法:根据开挖前后应力张量变化计算卸荷方向,利用Fisher分布函数生成围绕在卸荷方向附近的随机节理产状;监测卸荷前后颗粒中储存能量的变化,计算节理面积和半径。通过布置测线方式获得巷道中原生节理密度和产状信息,利用Monte-Carlo方法实现对原生节理的重建;利用次生节理计算方法实现次生节理网络的建立,从而建立仿真节理网络以及仿真节理岩体模型。计算结果显示:无节理模型中顶板和底板先破坏,以张拉破坏为主;而在仿真节理岩体模型中节理部位最先破坏,原生节理以剪切破坏为主,次生节理以张拉破坏为主,在高应力作用下巷道周边基本全部破坏,需整体支护且重点在左右两帮。该计算方法可为节理岩体中巷道的稳定性计算提供参考及建议。
In order to realize the simulation and simulation of the joint network surrounding the mining roadway and the stability analysis of the roadway in the jointed rock mass, the artificial joint rock mass model containing the particle flow block model, the native joint network and the secondary joint network was constructed. Aiming at the problem that the shape and area of secondary joints in rock mass can not be accurately measured, the calculation method of secondary joint shape and area under unloading is proposed. The unloading direction is calculated according to the change of stress tensor before and after excavation. The function generates random joints surrounding the unloading direction. The changes of stored energy in the particles before and after unloading are monitored to calculate the joint area and radius. Through the arrangement of survey lines, the density of native knots and the shape information in the roadway are obtained, and the reconstruction of the primary knuckles is realized by Monte-Carlo method. The secondary knuckle networks are established by the secondary knuckle method to establish the network of simulation knots and the simulation joints Rock mass model. The results show that in the jointless model, the roof and floor are destroyed first, and the main failure is tension failure. In the simulation joint rock mass model, the joints are the first to be destroyed, the primary joints are mainly shear failure, and the secondary joints are tensioned Destruction-based, under the action of high stress almost completely destroyed the surrounding roadway, requiring overall support and focus on the two help. The calculation method can provide reference and suggestion for the stability calculation of roadway in jointed rock mass.