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为了研究岩体节理裂隙分布规律对巷道围岩稳定性的影响,依据概率与统计理论建立了破碎岩体结构面产状、规模和密度的概率模型,并运用Monte-Carlo随机模拟方法生成了可以描述和表征破碎岩体及其裂隙结构信息的二维结构面网络模型.在此基础上,建立了破碎岩体条件下巷道围岩结构的离散元数值计算模型,分析了块状型和破碎型围岩的应力状态、塑性区分布以及变形特征.研究结果表明:岩体结构面分布的尺度和规模对巷道围岩的应力状态有较大影响,破碎型围岩的承载能力明显低于块状型围岩;破碎岩体变形不再是岩体材料的本质属性,而是破裂块体之间的镶嵌组合的一种结构效应.
In order to study the influence of rock mass joint fissure distribution on the stability of surrounding rock in roadway, probability model and statistical theory are used to establish the probability model for the occurrence, scale and density of rock mass discontinuity. Monte-Carlo stochastic simulation A two-dimensional structural surface network model describing and characterizing the information of fractured rock mass and its fracture structure is established. Based on the above, a discrete element numerical model for the surrounding rock structure of the rock mass under the condition of broken rock mass is established. The stress state, the distribution of plastic zone and the deformation features of the surrounding rock.The results show that the scale and scale of the distribution of the rock mass structure surface have a great influence on the stress state of the surrounding rock of the rock mass, and the bearing capacity of the broken rock is obviously lower than that of the block Type of surrounding rock; the deformation of the broken rock mass is no longer the essential attribute of the rock mass material, but a structural effect of the mosaic combination between the fractured blocks.