煤系泥岩典型应力阶段遇水强度弱化与渗透性实验研究
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摘要
采用MTS815.02S型电液伺服岩石力学实验系统,研究水岩相互作用条件下,煤系泥岩典型应力阶段岩体渗透性变化与遇水后强度弱化规律,并用原位窥视仪实验验证主要结论。研究表明:峰值强度前不同应力阶段遇水弱化程度差异不大,遇水后峰值强度平均降低了14.5%;残余强度阶段遇水对岩块稳定残余强度的弱化最高,达到50%左右,其次是塑性阶段与弹性阶段,在应变软化阶段由于泥质岩体渗流通道的自封闭作用,该阶段遇水对残余强度弱化程度最小;在破坏前的弹性变形乃至屈服阶段,渗透性较弱且随变形增加变化不明显;受载至应变软化阶段,渗透性增强并在残余强度阶段达到渗透峰值,在塑性压密变形阶段没有明显的降低,随变形扩展而逐步趋于稳定。
In consideration of water-rock interaction,strength weakening and permeability of the mudstone under different typical stress stages are studied by MTS815.02S servo-controlled rock mechanical test system.Main conclusions are verified by in-situ test using electrical camera.It shows that water-weakened action of specimen is not notable before the peak strength,and the peak strength decreases by 14.5%after affected by water;the water-weakened action is the highest in residual strength stage,steady peak strength decreases about 50%; water-weakened action in plastic stage and elastic stage are in the second place because of self-sealing action of fissures by water argillization action,and the water-weakened action is minimum in the strain softening stage.With the increasing of deformation,permeability variation of specimen is not notable and maintains lower value in the elastic and yield stage.Permeability coefficient begins to increase in the later strain-softening stage and reaches to the peak value in the residual strength stage,and then tends to steady in the plastic compaction stage.
In consideration of water-rock interaction,strength weakening and permeability of the mudstone under different typical stress stages are studied by MTS815.02S servo-controlled rock mechanical test system.Main conclusions are verified by in-situ test using electrical camera.It shows that water-weakened action of specimen is not notable before the peak strength,and the peak strength decreases by 14.5%after affected by water;the water-weakened action is the highest in residual strength stage,steady peak strength decreases about 50%; water-weakened action in plastic stage and elastic stage are in the second place because of self-sealing action of fissures by water argillization action,and the water-weakened action is minimum in the strain softening stage.With the increasing of deformation,permeability variation of specimen is not notable and maintains lower value in the elastic and yield stage.Permeability coefficient begins to increase in the later strain-softening stage and reaches to the peak value in the residual strength stage,and then tends to steady in the plastic compaction stage.
引文
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[16]李小琴,李文平,李洪亮.砂岩峰后卸除围压过程的渗透性试验研究[J].工程地质学报,2005,13(4):481–484.(LI Xiaoqin,LI Wenping,LI Hongliang.Experimental study on permeability of sand stone during post-peak unloading of the confining pressure[J].Journal of Engineering Geology,2005,13(4):481–484.(in Chinese))
[2]李世平,李玉寿,吴振业.岩石全应力应变过程对应的渗透率–应变方程[J].岩土工程学报,1995,17(2):13–19.(LI Shiping,LI Yushou,WU Zhenye.The permeability-strain equations relating to complete stress-strain path of the rock[J].Chinese Journal of Geotechnical Engineering,1995,17(2):13–19.(in Chinese))
[3]彦卿.裂隙岩体应力与渗流关系研究[J].水文地质工程地质,1995,(6):30–35.(WU Yanqing.Study on relationship between stress and seepage of cracked rocks[J].Hydrogeology and Engineering Geology,1995,(6):30–35.(in Chinese))
[4]周创兵,熊文林.地应力对裂隙岩体渗透特性的影响[J].地震学报,1997,19(2):154–163.(ZHOU Chuangbing,XIONG Wenlin.Influence of stress on permeability of cracked rocks[J].Acta Seismologica Sinica,1997,19(2):154–163.(in Chinese))
[5]姜振泉,季梁军,左如松,等.岩石在伺服条件下的渗透性与应变、应力的关联性特征[J].岩石力学与工程学报,2002,21(10):1442–1446.(JIANG Zhenquan,JI Liangjun,ZUO Rusong,et al.Correlativity among rock permeability and strain stress under servo-control condition[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(10):1442–1446.(in Chinese))
[6]彭苏萍,屈洪亮,罗立平,等.沉积岩石全应力应变过程的渗透性试验研究[J].煤炭学报,2000,25(2):113–116.(PENG Suping,QU Hongliang,LUO Liping,et al.An experimental study on the penetrability of sedimentary rock during the complete stress strain path[J].Journal of China Coal Society,2000,25(2):113–116.(in Chinese))
[7]彭苏萍,孟召平,王虎,等.不同围压下砂岩孔渗规律试验研[J].岩石力学与工程学报,2003,22(5):742–746.(PENG Suping,MENGZhaoping,WANG Hu,et al.Testing study on pore ratio and permeability of sandstone under different confining pressures[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(5):742–746.(in Chinese))
[8]郑纲.岩体裂隙三轴应力渗透规律的试验研究[J].工程地质学报,2007,35(1):42–46.(ZHENG Gang.Experimental study on the permeability regularities of rock cracks under triaxial compression[J].Journal of Engineering Geology,2007,35(1):42–46.(in Chinese))
[9]杨天鸿,赵兴东,冷雪峰,等.地下开挖引起围岩破坏及其渗透性演化过程仿真[J].岩石力学与工程学报,2003,22(增1):2386–2389.(YANG Tianhong,ZHAO Xingdong,LENG Xuefeng,et al.Numerical simulation on failure process of over burden rock strata and permeability evolution caused by mining excavation[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(Supp.1):2386–2389.(in Chinese))
[10]杨永杰,宋扬,陈绍杰.煤岩全应力应变过程渗透性特征试验研究[J].岩土力学,2007,28(2):381–385.(YANG Yongjie,SONG Yang,CHEN Shaojie.Test study on permeability properties of coal specimen in complete stress-strain process[J].Rock and Soil Mechanics,2007,28(2):381–385.(in Chinese))
[11]朱珍德,张爱军,徐卫亚.脆性岩石全应力–应变过程渗流特性试验研究[J].岩土力学,2002,23(5):555–563.(ZHU Zhende,ZHANG Aijun,XU Weiya.Experimental research on complete stress-strain process seepage characteristics of brittle rock[J].Rock and Soil Mechanics,2002,23(5):555–563.(in Chinese))
[12]孔亮,王媛.剪切荷载对裂隙渗透性影响研究现状[J].河海大学学报,2007,35(1):42–46.(KONG Liang,WANG Yuan.Influence of shear loads on fissure permeability[J].Journal of Hohai University,2007,35(1):42–46.(in Chinese))
[13]缪协兴,刘卫群,陈占清.采动岩体渗流理论[M].北京:科学出版社,2004.(MIAO Xiexing,LIU Weiqun,CHEN Zhanqing.Seepage theory of mining rock mass[M].Beijing:Science Press,2004.(in Chinese))
[14]刘卫群,缪协兴,陈占清.破碎岩石渗透性的试验测定方法[J].实验力学,2003,18(1):56–61.(LIU Weiqun,MIAO Xiexing,CHEN Zhanqing.A testing method for determining the permeability of over broken rock[J].Journal of Experimental Mechanics,2003,18(1):56–61.(in Chinese))
[15]程宜康,陈占清,缪协兴,等.峰后砂岩非Darcy流渗透特性的试验研究[J].岩石力学与工程学报,2004,23(12):2005–2009.(CHENG Yikang,CHEN Zhanqing,MIAO Xiexing,et al.Testing study on permeability of non-darcy flow in post-peak sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(12):2005–2009.(in Chinese))
[16]李小琴,李文平,李洪亮.砂岩峰后卸除围压过程的渗透性试验研究[J].工程地质学报,2005,13(4):481–484.(LI Xiaoqin,LI Wenping,LI Hongliang.Experimental study on permeability of sand stone during post-peak unloading of the confining pressure[J].Journal of Engineering Geology,2005,13(4):481–484.(in Chinese))
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