裂隙网络几何参数对岩体抗压强度影响及破坏模式研究  

Influence of Geometrical Parameters of Fracture Network on Compressive Strength and Failure Mode of Rock Mass

作　　者：夏子晋 袁海平[1] 方兴业 于旭阳 黄松涛 XIA Zijin;YUAN Haiping;FANG Xingye;YU Xuyang;HUANG Songtao(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《金属矿山》2023年第11期191-197,共7页Metal Mine

基　　金：国家自然科学基金项目(编号:51874112);安徽高校协同创新项目(编号:GXXT-2020-055)。

摘　　要：当前矿山巷道局部垮塌现象严重,其诱因多为岩体内部裂隙发育扩展,进一步导致岩体丧失自稳平衡能力而破坏。为探究裂隙几何参数对岩体强度性能的影响及其破坏模式,将离散元软件(PFC)与裂隙网络相结合,进行了岩体单轴抗压模拟。结果表明:岩体抗压强度随裂隙岩体中裂隙密度、倾角不断增大,分别呈负相关及“U”形分布趋势,裂隙倾角为45°时岩体强度最低;岩体破坏模式受裂隙形式影响,平行裂隙对岩体的影响程度较大。研究成果在一定程度上揭示了裂隙在岩体中的发育规律,也是影响岩体强度的关键因素,对探究工程中裂隙岩体稳定性及破坏过程有一定的参考意义。At present,local roadway collapse phenomenon is serious,which is mainly caused by the development and ex-pansion of internal fractures in rock mass,which further leads to the failure of rock mass due to the loss of self-stable equilibri-um ability.In order to explore the influence of fracture geometry parameters on rock mass strength and failure mode,the uniaxi-al compression simulation of rock mass was carried out by combining discrete element software(PFC)with fracture network.The results show that the compressive strength of rock mass shows a negative correlation and U-shaped distribution trend with the increasing of fracture density and dip angle in fractured rock mass,and the rock mass has the lowest compressive strength when the dip Angle is 45°.The failure mode of rock mass is affected by the form of fracture,and the parallel fracture has a great influence on the rock mass.The research results reveal the development law of fractures in rock mass to a certain extent,which is also the key factor affecting the strength of rock mass.It has a certain reference significance to explore the stability and failure process of fractured rock mass in engineering.

关 键 词：颗粒流 裂隙岩体 单轴压缩试验 数值模拟 

分 类 号：TD853[矿业工程—金属矿开采]