干湿循环对深部粉砂岩蠕变特性影响的试验研究
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摘要
为探究围岩含水率变化对深部岩体长期稳定性的影响,以朱集东煤矿-906 m处粉砂岩为研究对象,借助ZYSS2000型岩石高温高压蠕变仪,采用分级加载方式,对不同干湿循环次数粉砂岩试件开展单轴压缩蠕变试验。试验结果表明,随干湿循环次数增多,粉砂岩轴向蠕变应变和轴向稳态蠕变速率呈非线性增大,瞬时变形模量呈对数降低,且轴向蠕变应变和轴向稳态蠕变速率在1次干湿循环后出现较大增幅,瞬时变形模量在干湿循环0~1次阶段劣化度最大,为10.06%;不同干湿循环作用后的粉砂岩试件在最后一级应力作用下发生蠕变破坏的规律基本一致,且在相同的破坏应力下,随干湿循环次数的增多,粉砂岩试件蠕变破坏全程历时逐渐减小,减速蠕变段和加速蠕变段占全程历时的比例逐渐升高;粉砂岩的长期强度随干湿循环次数的增多逐渐降低,且在1次循环以后出现较大的降幅;粉砂岩的蠕变破坏特征随干湿循环次数增多呈现出由张拉破坏向剪切破坏转化。
In order to investigate the influence of moisture content on the long-term stability of deep rock,the siltstone from-906 m of Zhujidong coalmine was studied. A series of uniaxial compressive creep tests of cyclic wetting and drying on the siltstone were carried out in stepped loading on the rock creep testing machine ZYSS2000 under high temperature and high pressure. The test results show that with increasing of wetting and drying cycles,the axial creep strain and axial steady creep rate of siltstone increase nonlinearly,while the instantaneous deformation modulus decreases logarithmically. The axial creep strain and axial steady creep rate increase significantly after the first wetting and drying cycle. The degree of deterioration of the instantaneous deformation modulus from 0 to 1 stage is the biggest which is 10.06%. The creep failure curve of siltstone under various wetting and drying cycles present similar regularities under the last level of stress. With the increasing of the number of wetting and drying cycles,the whole time for creep failure of siltstone decrease gradually under the certain failure stress,while the proportion of transient creep stage and accelerated creep stage in the whole time increase gradually. The long-term strength of siltstone decreases gradually with the increasing of the number of wetting and drying cycles. The largest reduction occurs after the first wetting and drying cycle. The creep failure characteristics of siltstone present a transformation from tension failure to shear failure.
In order to investigate the influence of moisture content on the long-term stability of deep rock,the siltstone from-906 m of Zhujidong coalmine was studied. A series of uniaxial compressive creep tests of cyclic wetting and drying on the siltstone were carried out in stepped loading on the rock creep testing machine ZYSS2000 under high temperature and high pressure. The test results show that with increasing of wetting and drying cycles,the axial creep strain and axial steady creep rate of siltstone increase nonlinearly,while the instantaneous deformation modulus decreases logarithmically. The axial creep strain and axial steady creep rate increase significantly after the first wetting and drying cycle. The degree of deterioration of the instantaneous deformation modulus from 0 to 1 stage is the biggest which is 10.06%. The creep failure curve of siltstone under various wetting and drying cycles present similar regularities under the last level of stress. With the increasing of the number of wetting and drying cycles,the whole time for creep failure of siltstone decrease gradually under the certain failure stress,while the proportion of transient creep stage and accelerated creep stage in the whole time increase gradually. The long-term strength of siltstone decreases gradually with the increasing of the number of wetting and drying cycles. The largest reduction occurs after the first wetting and drying cycle. The creep failure characteristics of siltstone present a transformation from tension failure to shear failure.
引文
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[8]王子娟,刘新荣,傅晏,等.两种p H水环境干、湿循环作用对泥质砂岩的侵蚀研究[J].岩土力学,2016,37(11):3 231–3 239.(WANG Zijuan,LIU Xinrong,FU Yan,et al.Erosion analysis of argillaceous sandstone under dry-wet cycle in two p H conditions[J].Rock and Soil Mechanics,2016,37(11):3 231–3 239.(in Chinese))
[9]孙钧.岩石流变力学及其工程应用研究的若干进展[J].岩石力学与工程学报,2007,26(6):1 081–1 106.(SUN Jun.Rock rheological mechanics and its advance in engineering application[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(6):1 081–1 106.(in Chinese))
[10]杜超,杨春和,马洪岭,等.深部盐岩蠕变特性研究[J].岩土力学,2012,33(8):2 451–2 456.(DU Chao,YANG Chunhe,MA Hongling,et al.Study of creep characteristics of deep rock salt[J].Rock and Soil Mechanics,2012,33(8):2 451–2 456.(in Chinese))
[11]蒋海飞,刘东燕,黄伟,等.高围压下不同孔隙水压作用时岩石蠕变特性及改进西原模型[J].岩土工程学报,2014,36(3):443–451.(JIANG Haifei,LIU Dongyan,HUANG Wei,et al.Creep properties of rock under high confining pressure and different pore water pressures and a modified Nishihara model[J].Chinese Journal of Geotechnical Engineering,2014,36(3):443–451.(in Chinese))
[12]杨红伟,许江,聂闻,等.渗透水压力分级加载岩石蠕变特性研究[J].岩土工程学报,2015,37(9):1 613–1 619.(YANG Hongwei,XU Jiang,NIE Wen,et al.Experimental study on creep of rocks under step loading of seepage pressure[J].Chinese Journal of Geotechnical Engineering,2015,37(9):1 613–1 619.(in Chinese))
[13]蒋昱州,王瑞红,朱杰兵,等.砂岩的蠕变与弹性后效特性试验研究[J].岩石力学与工程学报,2015,34(10):2 010–2 017.(JIANG Yuzhou,WANG Ruihong,ZHU Jiebing,et al.Experimental study of creep and elastic aftereffect of sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(10):2 010–2 017.(in Chinese))
[14]邓华锋,周美玲,李建林,等.砂质泥岩三轴卸荷流变力学特性试验研究[J].岩土力学,2016,37(2):315–322.(DENG Huafeng,ZHOU Meiling,LI Jianlin,et al.Experimental research on unloading triaxial rheological mechanical properties of sandy mudstone[J].Rock and Soil Mechanics,2016,37(2):315–322.(in Chinese))
[15]李鹏,刘健,朱杰兵,等.软弱结构面剪切蠕变特性与含水率关系研究[J].岩土力学,2008,29(7):1 865–1 871.(LI Peng,LIU Jian,ZHU Jiebing,et al.Research on effects of water content on shear creep behavior of weak structural plane of sandstone[J].Rock and Soil Mechanics,2008,29(7):1 865–1 871.(in Chinese))
[16]李男,徐辉,胡斌.干燥与饱水状态下砂岩的剪切蠕变特性研究[J].岩土力学,2012,33(2):439–443.(LI Nan,XU Hui,HU Bin.Shear creep characteristics of sandstone under dry and saturated states[J].Rock and Soil Mechanics,2012,33(2):439–443.(in Chinese))
[17]张春阳,曹平,汪亦显.自然与饱水状态下深部斜长角闪岩蠕变特性[J].中南大学学报:自然科学版,2013,44(4):1 587–1 595.(ZHANG Chunyang,CAO Ping,WANG Yixian.Creep characteristics of plagioclase hornblende rock under natural and water-saturated conditions in deep underground[J].Journal of Central South University:Science and Technology,2013,44(4):1 587–1 595.(in Chinese))
[18]中华人民共和国行业标准编写组.SL264—2001水利水电工程岩石试验规程[S].北京:中国水利水电出版社,2001.(The Professional Standards Compilation Group of People?s Republic of China.SL264—2001 Specifications for rock tests in water conservancy and hydroelectric engineering[S].Beijing:China Water Power Press,2001.(in Chinese))
[19]武东生,孟陆波,李天斌,等.灰岩三轴高温后效流变特性及长期强度研究[J].岩土力学,2016,37(增1):183–191.(WU Dongsheng,MENG Lubo,LI Tianbin,et al.Study of triaxial property and long-term strength of limestone after high temperature[J].Rock and Soil Mechanics,2016,37(Supp.1):183–191.(in Chinese))
[20]傅晏.干湿循环水岩相互作用下岩石劣化机制研究[博士学位论文][D].重庆:重庆大学,2010.(FU Yan.Study on water-interaction with the cyclic drying-wetting effect on rock[Ph.D.Thesis][D].Chongqing:Chongqing University,2010.(in Chinese))
[21]李克钢.水岩物理作用下岩石力学特性研究[M].北京:冶金工业出版社,2016:43–68.(LI Kegang.Study on rock mechanical properties under physical interaction of water-rock[M].Beijing:Metallurgical Industry Press,2016:43–68.(in Chinese))
[2]邓华锋,李建林,刘杰,等.浸泡-风干循环作用对砂岩变形及破坏特征影响研究[J].岩土工程学报,2012,34(9):1 620–1 626.(DENG Huafeng,LI Jianlin,LIU Jie,et al.Influence of immersion-air dry circulation function on deformation and fracture features of sandstone[J].Chinese Journal of Geotechnical Engineering,2012,34(9):1 620–1 626.(in Chinese))
[3]邓华锋,罗骞,李建林,等.浸泡–风干循环作用下砂岩动力特性劣化规律研究[J].岩土力学,2013,34(9):2 468–2 474.(DENG Huafeng,LUO Qian,LI Jianlin,et al.Dynamic characteristics deterioration laws of sandstone under cyclic saturation-air drying[J].Rock and Soil Mechanics,2013,34(9):2 468–2 474.(in Chinese))
[4]李克钢,吴勇,郑东普.砂岩力学特性对干湿循环效应响应规律的试验研究[J].北京理工大学学报,2013,33(10):1 010–1 014.(LI Kegang,WU Yong,ZHENG Dongpu.Mechanical properties response of sandstone to cyclic drying-wetting effect[J].Transactions of Beijing Institute of Technology,2013,33(10):1 010–1 014.(in Chinese))
[5]袁璞,马芹永.干湿循环条件下煤矿砂岩分离式霍普金森压杆试验研究[J].岩土力学,2013,34(9):2 557–2 562.(YUAN Pu,MA Qinyong.Split Hopkinson pressure bar tests on sandstone in coalmine under cyclic wetting and drying[J].Rock and Soil Mechanics,2013,34(9):2 557–2 562.(in Chinese))
[6]刘新荣,李栋梁,王震,等.酸性干湿循环对泥质砂岩强度特性劣化影响研究[J].岩石力学与工程学报,2016,35(8):1 543–1 554.(LIU Xinrong,LI Dongliang,WANG Zhen,et al.The effect of dry-wet cycles with acidic wetting fluid on strength deterioration of shaly sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(8):1 543–1 554.(in Chinese))
[7]王子娟,刘新荣,傅妟,等.酸性环境干湿循环作用对泥质砂岩力学参数的劣化研究[J].岩土工程学报,2016,38(6):1 152–1 159.(WANG Zijuan,LIU Xinrong,FU Yan,et al.Deterioration of mechanical parameters of argillaceous sandstone under wetting-drying cycles in acidic environment[J].Chinese Journal of Geotechnical Engineering,2016,38(6):1 152–1 159.(in Chinese))
[8]王子娟,刘新荣,傅晏,等.两种p H水环境干、湿循环作用对泥质砂岩的侵蚀研究[J].岩土力学,2016,37(11):3 231–3 239.(WANG Zijuan,LIU Xinrong,FU Yan,et al.Erosion analysis of argillaceous sandstone under dry-wet cycle in two p H conditions[J].Rock and Soil Mechanics,2016,37(11):3 231–3 239.(in Chinese))
[9]孙钧.岩石流变力学及其工程应用研究的若干进展[J].岩石力学与工程学报,2007,26(6):1 081–1 106.(SUN Jun.Rock rheological mechanics and its advance in engineering application[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(6):1 081–1 106.(in Chinese))
[10]杜超,杨春和,马洪岭,等.深部盐岩蠕变特性研究[J].岩土力学,2012,33(8):2 451–2 456.(DU Chao,YANG Chunhe,MA Hongling,et al.Study of creep characteristics of deep rock salt[J].Rock and Soil Mechanics,2012,33(8):2 451–2 456.(in Chinese))
[11]蒋海飞,刘东燕,黄伟,等.高围压下不同孔隙水压作用时岩石蠕变特性及改进西原模型[J].岩土工程学报,2014,36(3):443–451.(JIANG Haifei,LIU Dongyan,HUANG Wei,et al.Creep properties of rock under high confining pressure and different pore water pressures and a modified Nishihara model[J].Chinese Journal of Geotechnical Engineering,2014,36(3):443–451.(in Chinese))
[12]杨红伟,许江,聂闻,等.渗透水压力分级加载岩石蠕变特性研究[J].岩土工程学报,2015,37(9):1 613–1 619.(YANG Hongwei,XU Jiang,NIE Wen,et al.Experimental study on creep of rocks under step loading of seepage pressure[J].Chinese Journal of Geotechnical Engineering,2015,37(9):1 613–1 619.(in Chinese))
[13]蒋昱州,王瑞红,朱杰兵,等.砂岩的蠕变与弹性后效特性试验研究[J].岩石力学与工程学报,2015,34(10):2 010–2 017.(JIANG Yuzhou,WANG Ruihong,ZHU Jiebing,et al.Experimental study of creep and elastic aftereffect of sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(10):2 010–2 017.(in Chinese))
[14]邓华锋,周美玲,李建林,等.砂质泥岩三轴卸荷流变力学特性试验研究[J].岩土力学,2016,37(2):315–322.(DENG Huafeng,ZHOU Meiling,LI Jianlin,et al.Experimental research on unloading triaxial rheological mechanical properties of sandy mudstone[J].Rock and Soil Mechanics,2016,37(2):315–322.(in Chinese))
[15]李鹏,刘健,朱杰兵,等.软弱结构面剪切蠕变特性与含水率关系研究[J].岩土力学,2008,29(7):1 865–1 871.(LI Peng,LIU Jian,ZHU Jiebing,et al.Research on effects of water content on shear creep behavior of weak structural plane of sandstone[J].Rock and Soil Mechanics,2008,29(7):1 865–1 871.(in Chinese))
[16]李男,徐辉,胡斌.干燥与饱水状态下砂岩的剪切蠕变特性研究[J].岩土力学,2012,33(2):439–443.(LI Nan,XU Hui,HU Bin.Shear creep characteristics of sandstone under dry and saturated states[J].Rock and Soil Mechanics,2012,33(2):439–443.(in Chinese))
[17]张春阳,曹平,汪亦显.自然与饱水状态下深部斜长角闪岩蠕变特性[J].中南大学学报:自然科学版,2013,44(4):1 587–1 595.(ZHANG Chunyang,CAO Ping,WANG Yixian.Creep characteristics of plagioclase hornblende rock under natural and water-saturated conditions in deep underground[J].Journal of Central South University:Science and Technology,2013,44(4):1 587–1 595.(in Chinese))
[18]中华人民共和国行业标准编写组.SL264—2001水利水电工程岩石试验规程[S].北京:中国水利水电出版社,2001.(The Professional Standards Compilation Group of People?s Republic of China.SL264—2001 Specifications for rock tests in water conservancy and hydroelectric engineering[S].Beijing:China Water Power Press,2001.(in Chinese))
[19]武东生,孟陆波,李天斌,等.灰岩三轴高温后效流变特性及长期强度研究[J].岩土力学,2016,37(增1):183–191.(WU Dongsheng,MENG Lubo,LI Tianbin,et al.Study of triaxial property and long-term strength of limestone after high temperature[J].Rock and Soil Mechanics,2016,37(Supp.1):183–191.(in Chinese))
[20]傅晏.干湿循环水岩相互作用下岩石劣化机制研究[博士学位论文][D].重庆:重庆大学,2010.(FU Yan.Study on water-interaction with the cyclic drying-wetting effect on rock[Ph.D.Thesis][D].Chongqing:Chongqing University,2010.(in Chinese))
[21]李克钢.水岩物理作用下岩石力学特性研究[M].北京:冶金工业出版社,2016:43–68.(LI Kegang.Study on rock mechanical properties under physical interaction of water-rock[M].Beijing:Metallurgical Industry Press,2016:43–68.(in Chinese))