峰值破裂岩石的气体渗透性试验研究  

Testing study of gas permeability of fracture rock under peak stress

作　　者：宋鑫[1] 刘卫群[1] 孙登松[1] 王波[1] 

机构地区：[1]中国矿业大学理学院,江苏徐州221008

出　　处：《岩土力学》2008年第11期3157-3160,共4页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.50774083);教育部"新世纪优秀人才支持计划"课题(NCET-07-0803);国家"973计划"项目子课题(No.2005CB221502)

摘　　要：为了测试采矿工程中峰值破裂岩体的气体渗透特性,设计了与气体渗透系统相配套的气体渗透仪。对淮南顾桥矿采集的标高-653～-771m的煤系岩石制成的标准岩样,先利用MTS815系统加压至峰值强度,而后测试其气体渗透性能。理论分析了一维非Darcy渗流过程及该情况下的渗透率求解方法。试验结果表明,即使位于深部,岩石破裂后的渗透率也比完整时大103～106个数量级,同时,破裂砂岩的渗透率要比同标高的破裂泥岩高。A device combined with system of gas permeability measurement was designed to investigate the gas permeability of fracture rock under peak stress in mining. Several groups of fracture rock with elevations of -653 m to -771 m from Guqiao coal mine were employed as the standard samples of gas permeability testing. By the aid of MTS815, the samples achieved their peak stress, and the gas permeability of them was obtained in that elevations. Furthermore, one-dimensional permeability of non-Darcy flow and the solution of their gas infiltration rates are also analyzed theoretically. It is shown that, even in the deep-seated, the gas infiltration rate of rock of that kind is remarkable larger about 10^3-10^4 order than that of integrity rock. Meanwhile, the infiltration rate of fracture sandstone is higher than that of fracture mudstone in the same elevation.

关 键 词：峰值 破裂岩石 气体渗透性 试验 

分 类 号：TU457[建筑科学—岩土工程]