含水层砂岩应力应变全程非线性渗流的试验研究
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摘要
砂岩是煤系地层中主要的含水层之一,砂岩的非Darcy流渗透特性参量的变化规律是揭示煤矿突水机理的基础.本文通过归纳分析了非Darcy流渗透特性参数的由来和具体的物理意义,利用自主研发的圆柱形标准岩样渗透性测试系统配合使用MTS816.02电液伺服岩石力学实验系统对含水层砂岩试样进行了非Darcy流渗透性测试.得到了砂岩试样的渗透率、非Darcy流β因子和加速度系数.研究结果表明:在弹性阶段,渗透率减小,加速度系数增大,在轴向应变为1.0%附近,渗透率最小,加速度系数最大.在峰值应力状态下,非Darcy因子β最小.渗透率与加速度系数之间的关系可以用幂乘函数描述;渗透率与非Darcy流β因子之间的关系可以用ExpDec模型描述;非Darcy流β因子和加速度系数之间的关系可以用BoxLucas模型描述.
Sandstone is one of the main aquifer in coal measures strata.Its variation law of non-Darcy permeability parameters is the key to explore mechanism of water inrush in coal mine.The origin and specific physical significance of non-Darcy flow permeability parameters are analyzed.A fluid flow test is conducted to investigate the permeability parameters using MTS816.02 and a designed seepage experimental system.The permeability,non-Darcy flowβfactors and acceleration coefficient are obtained.The experimental results show that permeability value decreases to minimum,while acceleration coefficient increases to maximum when axial strain is 1.0%,in elastic stage.The value of non-Darcy flowβfactors reaches minimum with highest stress.The relationship between permeability and acceleration coefficient can be described by power multiplication function.The relationship between permeability and non-Darcy flowβfactors can be described by ExpDec model.The relationship between non-Darcy flowβfactors and acceleration coefficient can be described by BoxLucas model.
Sandstone is one of the main aquifer in coal measures strata.Its variation law of non-Darcy permeability parameters is the key to explore mechanism of water inrush in coal mine.The origin and specific physical significance of non-Darcy flow permeability parameters are analyzed.A fluid flow test is conducted to investigate the permeability parameters using MTS816.02 and a designed seepage experimental system.The permeability,non-Darcy flowβfactors and acceleration coefficient are obtained.The experimental results show that permeability value decreases to minimum,while acceleration coefficient increases to maximum when axial strain is 1.0%,in elastic stage.The value of non-Darcy flowβfactors reaches minimum with highest stress.The relationship between permeability and acceleration coefficient can be described by power multiplication function.The relationship between permeability and non-Darcy flowβfactors can be described by ExpDec model.The relationship between non-Darcy flowβfactors and acceleration coefficient can be described by BoxLucas model.
引文
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[3]赵全福.中国煤矿防治水技术经验汇编[M].北京:煤炭工业出版社,1998.
[4]Brace,Matthew.Predicting coal mine water[M].Australian Mining,2006:Reed Business Publishing Pty.Ltd.
[5]王永红,沈文.中国煤矿水害预防及治理[M].北京:煤炭工业出版社,1996.
[6]孟召平,高延法,卢爱红.矿井突水危险性评价理论与方法[M].科学出版社.2011.
[7]Sun Jian,Wang Lianguo,Wang Zhansheng,Hou Huaqiang,Shen Yifeng.Determining areas in an inclined coal seam floor prone to water-inrush by micro-seismic monitoring[J].Mining Science and Technology,2011,21(2):165-168.
[8]许家林,朱卫兵,王晓振.松散承压含水层下采煤突水机理与防治研究[J].采矿与安全工程学报,2011,28(3):333-339.
[9]孙明贵,李天珍,黄先伍,等.基于层状岩体渗流失稳条件的煤矿突水机理[J].中国矿业大学学报,2005,34(3):284-288.
[10]陈占清,缪协兴,刘卫群.采动围岩中参变渗流系统的稳定性分析[J].中南大学学报自然科学版,2004,35(1):129-132.
[11]缪协兴,刘卫群,陈占清.采动岩体渗流与煤矿灾害防治[J].西安石油大学学报(自然科学版),2007,22(2):74-77.
[12]Forchheimer P.Wasserbewegung durch boden[J].Zeit Ver Deutsch Ing,1901,45:1782-1788.
[13]Cornell D,Katz D L.Flow of Gases through Consolidated Porous Media[J].Industrial&Engineering Chemistry,2002,45(10):2145-2152.
[14]孔祥言.高等渗流力学[M].中国科学技术大学出版社,2010.
[15]Nield D A,Bejan A.Convection in Porous Media[J].Springer Berlin,2012,108(2):284-290.
[16]陈占清.峰后岩石非Darcy渗流系统的分岔行为研究[D].徐州:中国矿业大学,2003.