裂隙粗砂岩渗透率的应力与时间效应研究  

Study on Stress and Time Effect of the Permeability of Fractured Coarse Sandstone

作　　者：韩泽宇 王伟 牛庆合[1,2,3] 杨金鹏 何卓冉 Han Zeyu;Wang Wei;Niu Qinghe;Yang Jinpeng;He Zhuoran(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;State Key Laboratory of Structural Mechanics Behavior and System Safety of Traffic Engineering,Shijiazhuang 050043,China;Metal Mine Safety and Efficiency Mining Technology Innovation Center of Hebei Province,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043 [3]河北省金属矿山安全高效开采技术创新中心,河北石家庄050043

出　　处：《石家庄铁道大学学报（自然科学版）》2023年第4期48-54,共7页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金-核技术创新联和基金(U1967208);国家自然科学基金面上项目(51979170);河北省自然科学基金(F2021210128)。

摘　　要：为了探究爆破增渗对储层改造后裂隙岩体渗透率随应力与时间的演化规律,通过室内试验,研究了应力和时间作用下单裂隙粗砂岩和多裂隙粗砂岩渗透率演化规律。主要结果如下:在应力和时间影响下,多裂隙粗砂岩的渗透率始终高于单裂隙粗砂岩,但在应力影响下其应力敏感性系数低于单裂隙粗砂岩,并且同一种类型的裂隙粗砂岩渗透率应力敏感性系数存在孔压>围压>轴压这一关系。单裂隙粗砂岩的渗透率随轴压和围压增加而降低,随孔压增加而升高。其渗透率应力敏感性系数随轴压和孔压的增加而增大,随围压的增加而降低;多裂隙粗砂岩的渗透率随轴压和围压增加而降低,随孔压增加先降低后增加。其渗透率应力敏感性系数随轴压的增加而降低,随孔压的增大而增大,随围压的增加先增加后降低。在渗流-时间试验中,单裂隙粗砂岩和多裂隙粗砂岩的渗透率随时间演化主要呈3个阶段,第1阶段渗透率快速降低,第2阶段缓慢降低,第3阶段趋于稳定。在开始的24 h内,单裂隙粗砂岩的渗透率降低幅度大于多裂隙粗砂岩。之后随着时间的变化,单裂隙粗砂岩和多裂隙粗砂岩的渗透率逐渐稳定。In order to explore the evolution law of the permeability of fractured rock mass with stress and time after reservoir transformation by blasting and infiltration,this paper studied the evolution of the permeability of single-fractured coarse sandstone and multi-fractured coarse sandstone under stress and time through indoor experiments.The main results are as follows:Under the influence of stress and time,the permeability of multi-fractured coarse sandstone is always higher than that of single-fractured coarse sandstone,but its stress sensitivity coefficient is lower than that of single-fractured coarse sandstone under the influence of stress.Moreover,the same type of fracture coarse sandstone permeability stress sensitivity coefficient has the relationship between pore pressure>confining pressure>axial pressure.The permeability of single-fractured coarse sandstone decreases with the increase of axial pressure and confining pressure,and increases with the increase of pore pressure.The permeability stress sensitivity coefficient increases with the increase of axial pressure and pore pressure,and decreases with the increase of confining pressure.The permeability of coarse sandstone with multiple fractures decreases with the increase of axial pressure and confining pressure,and decreases first and then increases with the increase of pore pressure.The permeability stress sensitivity coefficient decreases with the increase of axial pressure,while increases with the increase of pore pressure,and first increases and then decreases with the increase of confining pressure.In the seepage-time test,the permeability of single-fractured coarse sandstone and multi-fractured coarse sandstone mainly evolved in three stages with time:The first stage permeability decreased rapidly,the second stage slowly decreased,and the third stage tended to be stable.In the first 24 hours,the permeability of single-fractured coarse sandstone decreased more than that of multi-fractured coarse sandstone.Later,with the changes of time,the permeabi

关 键 词：爆破增渗 应力 时间 渗透率 应力敏感性系数 

分 类 号：TU413.8[建筑科学—岩土工程]