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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.
In order to study the relationship between the permeability characteristics of coal and rock and the stress and fracture in the working face, a self-developed coal-gas coupling two-way loading test system was used to study the stress-fracture-permeability of large coal and rock samples under the condition of quasi-plane strain The results show that the changes of stress-fracture-permeability of coal and rock samples with different scales have correlation and are segmental characteristics; the local instability of coal samples and the outward development of fractures during loading lead to 3 The results show that the permeability characteristics of coal samples vary with different internal structure of samples, and the characteristics of stress lag in coal samples are obvious. The brittleness of rock samples is obvious , The permeability characteristics of a sudden change and the maximum seepage velocity moment of rupture time is basically synchronized.