准平面应变条件下大尺寸煤岩样的渗透特性研究  

Study on seepage properties of large-sized coal and rock sample in quasi-plane strain state

作　　者：王祖洸 高保彬[1,2] 王俊鹏[1,2] 

机构地区：[1]河南省瓦斯地质与瓦斯治理重点实验室--省部共建国家重点实验室培育基地,河南焦作454000 [2]河南理工大学安全科学与工程学院,河南焦作454000

出　　处：《湖南科技大学学报（自然科学版）》2016年第2期8-13,共6页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(51274086)

摘　　要：为研究采掘工作面煤岩渗透特性与应力、裂隙之间的关系,利用自行研制的煤-气耦合双向加载试验系统,在准平面应变条件下对大尺寸煤、岩样的应力-裂隙-渗透特性变化规律进行试验.结果表明:不同尺度的煤岩样的应力-裂隙-渗透特性变化具有相关性,呈分段性特征;加载过程中煤样局部失稳和裂隙的由外向内发展导致3种煤样渗透特性曲线在压密和弹性阶段出现"锯齿"形不光滑现象;试样内部结构的不同,导致渗透特性变化各异;煤样出现应力滞后性特点;岩样脆性特征明显,渗透特性出现突变且渗流速度最大时刻与岩石破断时刻基本同步.For study the relationship of coal and rock seepage properties between stress and fracture in cutting face,the self-developed coal-gas coupling and bidirectional loading system was used to conduct the change law of the large-sized coal and rock sample＇s stress-fracture-seepage properties in Quasi-plane strain state. Test results indicate that the variation of different scale coal and rock sample＇s stress-fracture-permeability have correlation and fractional characteristic. The seepage properties curve of three coal samples appear ＂saw-tooth＂,which is not smooth phenomenon in the stage of pressure consolidation and elastic,the cause of this phenomenon is local buckling and the fractures develop from external to inward of coal sample in upload process. Different internal structure of sample leads to seepage properties transformation. Coal samples appear stress hysteresis. It is obvious of the rock sample brittle characteristic. The rock sample permeability emerges mutation and the largest moment of seepage velocity and the rupture time of rock are almost simultaneously.

关 键 词：准平面应变 大尺寸煤岩样 应力-裂隙-渗透特性 滞后性 

分 类 号：TU452[建筑科学—岩土工程]