阶段性循环载荷对突出煤样渗透特性的影响  

Effect of outburst coal's gas seepage properties under stage cyclic loading

作　　者：李晓泉[1,2] 尹光志[1] 蒋长宝[1] 蔡波[1] 

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]广西大学资源与冶金学院,南宁530004

出　　处：《重庆大学学报（自然科学版）》2012年第1期110-116,共7页Journal of Chongqing University

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB201203);国家自然科学基金资助项目(50874124);中央高校基本科研业务费资助项目(CDJXS11240004);重庆大学'211工程'三期创新人才培养计划建设项目(S-10220)

摘　　要：利用自行研制的'含瓦斯煤热流固耦合三轴伺服渗流系统',进行固定瓦斯压力及不同围压和循环载荷情况下突出煤煤样变形渗透特性试验研究。结果表明:加载路径对煤样的力学特性影响显著,循环载荷试验和全应力-应变曲线总体趋势相同,循环荷载作用下煤样的峰值应力比全应力-应变的低;煤样在周期性循环荷载作用下的卸载应力-应变曲线与加载应力-应变曲线不相重合,形成封闭的滞回环。渗透率与煤样的损伤变形进程密切相关,在循环荷载下,渗透率在卸载过程中逐渐增大,加载过程中逐渐减小;卸载时渗透率-应变曲线和加载时渗透率-应变曲线会围成封闭环,与煤样的轴向应力-应变封闭滞回环相对应,其所围面积随着围压和应力水平增加而减小。Experiments of outburst coal＇s gas seepage and deformation under cyclic loading of the stationary gas pressure and different confining pressures are made by ＂fluid-solid-heat coupling with axis servo seepage system of coal＂. The results show that loading route has a significant effect on mechanical properties of coal sample. Although the complete stress-strain curves and one cyclic loading curve present similarity in the overall trend, the stress peak value of coal sample under cyclic loading is lower. Under cyclic loading, the stress strain curves during loading and unloading don＇t overlap. They connect to form a hysteretic loop. The permeability is in close relation with the damage deformation process of coal sample. Under cyclic loading, permeability is increasing during the unloading and decreasing during the loading. The permeability-strain curves during loading and unloading form a hysteretic loop, which is corresponding with the hysteretic loop of stress-strain curves of coal sample.

关 键 词：岩石力学 型煤 循环荷载 瓦斯渗流 力学特性 固气耦合三轴试验 

分 类 号：O357.3[理学—流体力学]