支撑剂嵌入作用下煤岩裂隙压缩性及渗流特性  

Coal fracture's compressibility and permeability under proppant embedding

作　　者：成巧耘 李波波[1,2,3] 李建华 高政 王斌[1] CHENG Qiaoyun;LI Bobo;LI Jianhua;GAO Zheng;WANG Bin(College of Mining,Guizhou University,Guiyang Guizhou 550025,China;National&Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas,Guizhou University,Guiyang Guizhou 550025,China;Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources,Guizhou University,Guiyang Guizhou 550025,China)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]贵州大学喀斯特地区优势矿产资源高效利用国家地方联合工程实验室,贵州贵阳550025 [3]贵州大学贵州省非金属矿产资源综合利用重点实验室,贵州贵阳550025

出　　处：《中国安全科学学报》2021年第10期105-111,共7页China Safety Science Journal

基　　金：国家自然科学基金资助(51804085,52064007);贵州省科学技术基金资助(黔科合基础-ZK[2021]重点052)。

摘　　要：为探究应力与支撑剂协同作用下煤岩裂隙压缩性及渗透特性,基于赫兹接触理论量化支撑剂的嵌入深度,推导出支撑剂影响下裂隙压缩性的计算式;同时,考虑多因素耦合对煤岩渗透能力的影响,进一步构建渗透率模型,并验证其合理性。研究结果表明:支撑剂嵌入深度与有效应力成正比,且随有效应力的增大,渗透率先减小而后趋于平缓;当气体压力恒定时,支撑剂嵌入使煤岩裂隙压缩性减小,当嵌入深度恒定时,煤岩裂隙压缩性随气体压力的增大而增大;铺置支撑剂的煤岩裂隙渗透率远大于原始状态下的渗透率,但铺置层数越大,增透效果越不明显;所建煤岩裂隙渗透率模型计算值与试验值具有较好的一致性,可有效表征应力与支撑剂作用下的煤岩渗流特性。In order to explore coal fracture's compressibility and permeability under influence of stress and proppant,embedding depth of proppant was quantified by using Hertz contact theory,and a calculation formula of fracture compressibility was derived.Meanwhile,a permeability model was established considering coupling influence of multiple factors,and its validity was verified.The results show that embedding depth of proppant is proportionate to effective stress,and permeability decreases first and then levels off as effective stress grows.When gas pressure is constant,embedding of proppant reduces compressibility of coal fissures,but while at a constant embedding depth,the compressibility increases along with that of gas pressure.Meanwhile,permeability of coal fractures with proppant is much higher than that in the original state,but more paving layers lead to less obvious anti-reflection effect.As the established model's calculated value of permeability is generally consistent with test results,it can can effectively characterize seepage features of coal under actions of stress and proppant.

关 键 词：支撑剂嵌入 煤岩 裂隙压缩性 渗透率 铺置层数 

分 类 号：X936[环境科学与工程—安全科学]