基于离散元渗流-应力耦合的节理岩体破坏机理研究  

Study on the Failure Mechanism of Jointed Rock Mass Based on Seepage-stress Coupling Distinct Element Model

作　　者：伊康 李飞扬[1] 尚奇[1] 刘建伟[1] 

机构地区：[1]太原理工大学,山西太原030024

出　　处：《矿业研究与开发》2017年第9期55-58,共4页Mining Research and Development

基　　金：国家"十二五"科技支撑计划资助项目(2012BAB13B04)

摘　　要：采用三维离散元程序3DEC 5.00建立节理岩体模型,并利用Fluid模块进行渗流-应力耦合分析。研究表明:岩体在单侧水压和覆岩压力下,节理内孔隙压力沿程线性衰减,并使节理面应力状态由稳定区向破坏区迁移;岩体沿节理面从孔隙压力最高处开始发生剪切破坏,并向孔隙压力最低处发展;在剪切破坏发展方向上,节理面不断出现新的剪应力集中与瞬间剪切破坏,残余剪应力τr=(正应力σn-孔隙压力p)The jointed rock mass model was established by the three-dimensional distinct element program 3DEC 5.00, and theseepage-stress coupling analysis was carried out by Fluid module. The research showed that as the rock mass under unilateralwater pressure and overburden pressure, the pore pressure presented linear attenuation along joint, which made the stress stateof jointed surface move from stable region to damage region. The shear failure of rock mass began to produce at the highestpore pressure along the joint surface, and developed to the lowest pore pressure. In the development direction of shear failure,new shear stress concentration and instant shear failure constantly occurred in joint surface, and residual shear stress τr =（normal stress （σn） -- pore pressure （p）） X friction coefficient （tanqφ））.

关 键 词：节理岩体 离散元 渗流 耦合 破坏机理 

分 类 号：TD315.3[矿业工程—矿井建设]