破碎岩体巷道变形破坏特征的数值模拟研究  

Numeriacl Simulation for Deformation Failure Characters in Roadway with Broken Rock Mass

作　　者：李慎举[1] 王连国[2] 陆银龙[2] 

机构地区：[1]霍州煤电集团公司,山西霍州031400 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《采矿与安全工程学报》2011年第1期39-44,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(50874103);江苏省自然科学基金项目(BK2008135);国家重点基础研究发展计划(973)项目(2010CB226805);江苏省青蓝工程项目

摘　　要：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 research the effect of rock joints and fractures distribution on wall rock stability,we establish the strike-dip,the size and density models of the structural surfaces of the broken rock mass by taking the roadway with broken rock mass as the study object.Then,using the Monte-Carlo random simulation method,we establish the 2-D structural surfaces network model to describe and characterize the broken rock mass and the information of the fracture.On this basis,we establish the discrete element numerical model of the roadway with broken rock mass and analyze the stress state,plastic zone distribution,and deformation features of the block and broken rock mass.The results show that 1） the size and the scale of the rock mass structural surfaces have a significant effect on the wall rock stress,2） the carrying capacity of the broken wall rock is obviously lower than that of the block wall rock and the deformation of the broken rock mass is not the essential attribute of the rock mass materials but is a structure effect of the broken blocks.

关 键 词：破碎岩体 二维结构面网络 离散元 巷道 变形破坏特征 

分 类 号：TD31[矿业工程—矿井建设]