热–力作用下层状砂岩各向异性三轴压缩试验研究
|
摘要
利用MTS815型程控伺服刚性试验机对层状砂岩开展高温常规三轴压缩试验,基于试验结果分析试样的变形参数、强度特征和破坏模式随着温度(20℃～150℃)和层理角度(0°～90°)的变化规律,探讨层状砂岩各向异性的温度效应。结果表明:(1)随着角度的增大,岩样弹性模量呈现减小的趋势;泊松比、起裂应力、扩容应力和峰值应力呈现先减小后增大的趋势;(2)随着温度的升高,弹性模量呈现先增大后减小的趋势,泊松比呈现先减小后增大的趋势;温度20℃～120℃,起裂应力、扩容应力和峰值应力整体呈现弱增长的趋势,温度超过120℃后大幅度减小,温度120℃～150℃范围存在一个临界温度值,使得砂岩力学性质发生突变;(3)层状砂岩的各向异性程度属于低级各向异性,温度20℃～120℃,砂岩的各向异性度随温度变化不大,温度120℃～150℃,随着温度的升高,砂岩的各向异性度有所提高;(4)层状砂岩的破坏模式受到温度和角度的共同影响。岩样破坏随温度的升高由剪切破坏向张拉破坏过渡;角度30°时,岩样主要发生沿着层理面的剪切破坏,而且角度30°时岩样的强度最低,表明角度30°是该砂岩力学特性、强度特征和破裂模式最不利角度。
Using MTS815 type programmable servo rigidity tester in high temperature sandstone plates on the conventional triaxial compression test,based on the test result analysis of the characteristics and deformation parameters and strength of the specimen failure mode as temperatures(20 ℃–150 ℃) and the angle of bedding(0°–90°),and discusses the layered sandstone anisotropic temperature effect. The results show that:(1) With the increase of angle,elastic modulus of rock shows the trend of decrease. Poisson?s ratio,crack stress,stress and peak stress shows the trend of increase with the decrease of the first.(2) With the increase of temperature,the elastic modulus showed a trend of decrease after the first increase,Poisson?s ratio shows the trend of increase with the decrease of the first. Temperature 20 ℃–120 ℃,crack expansion and stress,stress and peak stress overall weak growth trends,significantly reduced after the temperature over 120 ℃,the temperature between 120 ℃–150 ℃a critical temperature,makes the mechanical properties of sandstone mutation.(3) The degree of anisotropy sandstone plates belongs to low anisotropy,the anisotropy of sandstone varies little with temperature from 20 ℃to 120 ℃,and temperature 120 ℃–150 ℃,with the increase of temperature,improve the degree of anisotropy of sandstone.(4) The failure modes of bedded sandstone are affected by temperature and angle of the common.Rock damage with temperature rise by the shear failure makes the transition to tension damage. Angle of 30°,the sample mainly occurs shear damage along the bedding plane,and the strength of the rock sample minimum angle of 30°,indicating that the sandstone angle of 30° is mechanical characteristics,strength characteristics and failure mode of the most unfavourable angle.
Using MTS815 type programmable servo rigidity tester in high temperature sandstone plates on the conventional triaxial compression test,based on the test result analysis of the characteristics and deformation parameters and strength of the specimen failure mode as temperatures(20 ℃–150 ℃) and the angle of bedding(0°–90°),and discusses the layered sandstone anisotropic temperature effect. The results show that:(1) With the increase of angle,elastic modulus of rock shows the trend of decrease. Poisson?s ratio,crack stress,stress and peak stress shows the trend of increase with the decrease of the first.(2) With the increase of temperature,the elastic modulus showed a trend of decrease after the first increase,Poisson?s ratio shows the trend of increase with the decrease of the first. Temperature 20 ℃–120 ℃,crack expansion and stress,stress and peak stress overall weak growth trends,significantly reduced after the temperature over 120 ℃,the temperature between 120 ℃–150 ℃a critical temperature,makes the mechanical properties of sandstone mutation.(3) The degree of anisotropy sandstone plates belongs to low anisotropy,the anisotropy of sandstone varies little with temperature from 20 ℃to 120 ℃,and temperature 120 ℃–150 ℃,with the increase of temperature,improve the degree of anisotropy of sandstone.(4) The failure modes of bedded sandstone are affected by temperature and angle of the common.Rock damage with temperature rise by the shear failure makes the transition to tension damage. Angle of 30°,the sample mainly occurs shear damage along the bedding plane,and the strength of the rock sample minimum angle of 30°,indicating that the sandstone angle of 30° is mechanical characteristics,strength characteristics and failure mode of the most unfavourable angle.
引文
[1]FAHIMIFAR A.Strength and deformation properties of a schist rock in Isfahan[J].Iranian Journal of Science and Technology,2004,47(5):619-622.
[2]张久长,彭立,许湘华,等.横观各向同性岩石弹塑性耦合变形的试验研究[J].岩石力学与工程学报,2011,30(2):267-274.(ZHANG Jiuchang,PENG Li,XU Xianghua,et al.Experimental Study of Elastoplastic Coupline Deformation for Transversely Isotropic Rocks[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(2):267-274.(in Chinese))
[3]HANNA K,JUNG-WOO C,INSUN S,et al.Anisotropy of elastic moduli,P-wave velocities,and thermal conductivities of Asan Gneiss,Boryeong Shale,and Yeoncheon Schist in Korea[J].Engineering Geology,2012,147-148(12):68-77.
[4]俞然刚,田勇.砂岩岩石力学参数各向异性研究[J].实验力学,2013,28(3):368-375.(YU Rangang,TIAN Yong.On the rock mechanics parameters anisotropy of sandstone[J].Journal of Experimental Mechanics,2013,28(3):368-375.(in Chinese))
[5]王丰,孟陆波,李天斌.千枚岩常规三轴压缩各向异性特征试验研究[J].公路,2014,(10):216-222.(WANG Feng,MENG Lubo,LIAN Tianbin.Study of phyllite rock anisotropy properties by conventional triaxal compression tests[J].Highway,2014,(10):216-222.(in Chinese))
[6]TIEN Y M,KUO M C,JUANG C H.A experimental investigation of the failure mechanism of simulated transversely isotropic rocks[J].International Journal of Rock Mechanics and Mining Sciences,2006,43:1 163-1 181.
[7]衡帅,杨春和,张保平,等.页岩各向异性特征的试验研究[J].岩土力学,2015,36(3):609-616.(HENG Shuai,YANG Chunhe,ZHANG Baoping,et al.Experimental research on anisotropic properties of shale[J].Rock and Soil Mechanics,2015,36(3):609-616.(in Chinese))
[8]张连英.高温作用下泥岩的损伤演化及破裂机理研究[博士学位论文][D].北京:中国矿业大学,2012.(ZHANG Lianying.Research on damage evolution and fracture mechanisms of mudstone under high temperature[Ph.D.Thesis][D].Beijing:China University of Mining and Technology,2012.(in Chinese))
[9]吴刚,王德咏,翟松韬.单轴压缩下高温后砂岩的声发射特性[J].岩土力学,2012,33(11):3 237-3 242.(WU Gang,WANG Deyong,ZHAI Songtao.Acoustic emission characteristics of sandstone after high temperature under uniaxial compression[J].Rock and Soil Mechanics,2012,33(11):3 237-3 242.(in Chinese))
[10]周思孟.复杂岩体若干岩石力学问题[M].北京:中国水利水电出版社,1998:233.(ZHOU Simeng.Some rock mechanics problems in complex rock body[M].Beijing:China Water and Power Press,1998:233.(in Chinese))
[11]胡云华.高应力下花岗岩力学特性试验及本构模型研究[博士学位论文][D].武汉:中国科学院武汉岩土力学研究所,2008.(HUYunhua.Study on mechanical properties of granites under high pressure conditions and its constitutive models[Ph.D.Thesis][D].Wuhan:Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,2008.(in Chinese))
[12]黄书岭.高应力下脆性岩石的力学模型与工程运用研究[博士学位论文][D].武汉:中国科学院武汉岩土力学研究所,2008.(HUANGShuling.Study on mechanical model of brittle rock under high stress condition and its engineering applications[Ph.D.Thesis][D].Wuhan:Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,2008.(in Chinese))
[13]张晓平,王思敬,韩庚友,等.岩石单轴压缩条件下裂纹扩展试验研究——以片状岩石为例[J].岩石力学与工程学报,2011,30(9):1 772-1 781.(ZHANG Xiaoping,WANG Sijing,HAN Gengyou,et al.Crack propagation study of rock based on uniaxial——a case study of schistose rock[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(9):1 772-1 781.(in Chinese))
[14]CAI M,KAISER P K,TASAKA Y,et al.Generalized crack initiation and crack damage stress thresholds of brittle rock masses near underground excavations[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(5):833-847.
[15]NIANDOU H,SHAO J F,HENRY J P.Laboratory investigation of the behaviour of tournemire shale mechanics[J].International Journal of Mechanical Sciences,1997,34(1):3-6.
[16]RAMAMURTHY T.Strength,modulus responses of anisotropicrocks[J].Compressive Rock Engineering,1993,(1):313-329.
[2]张久长,彭立,许湘华,等.横观各向同性岩石弹塑性耦合变形的试验研究[J].岩石力学与工程学报,2011,30(2):267-274.(ZHANG Jiuchang,PENG Li,XU Xianghua,et al.Experimental Study of Elastoplastic Coupline Deformation for Transversely Isotropic Rocks[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(2):267-274.(in Chinese))
[3]HANNA K,JUNG-WOO C,INSUN S,et al.Anisotropy of elastic moduli,P-wave velocities,and thermal conductivities of Asan Gneiss,Boryeong Shale,and Yeoncheon Schist in Korea[J].Engineering Geology,2012,147-148(12):68-77.
[4]俞然刚,田勇.砂岩岩石力学参数各向异性研究[J].实验力学,2013,28(3):368-375.(YU Rangang,TIAN Yong.On the rock mechanics parameters anisotropy of sandstone[J].Journal of Experimental Mechanics,2013,28(3):368-375.(in Chinese))
[5]王丰,孟陆波,李天斌.千枚岩常规三轴压缩各向异性特征试验研究[J].公路,2014,(10):216-222.(WANG Feng,MENG Lubo,LIAN Tianbin.Study of phyllite rock anisotropy properties by conventional triaxal compression tests[J].Highway,2014,(10):216-222.(in Chinese))
[6]TIEN Y M,KUO M C,JUANG C H.A experimental investigation of the failure mechanism of simulated transversely isotropic rocks[J].International Journal of Rock Mechanics and Mining Sciences,2006,43:1 163-1 181.
[7]衡帅,杨春和,张保平,等.页岩各向异性特征的试验研究[J].岩土力学,2015,36(3):609-616.(HENG Shuai,YANG Chunhe,ZHANG Baoping,et al.Experimental research on anisotropic properties of shale[J].Rock and Soil Mechanics,2015,36(3):609-616.(in Chinese))
[8]张连英.高温作用下泥岩的损伤演化及破裂机理研究[博士学位论文][D].北京:中国矿业大学,2012.(ZHANG Lianying.Research on damage evolution and fracture mechanisms of mudstone under high temperature[Ph.D.Thesis][D].Beijing:China University of Mining and Technology,2012.(in Chinese))
[9]吴刚,王德咏,翟松韬.单轴压缩下高温后砂岩的声发射特性[J].岩土力学,2012,33(11):3 237-3 242.(WU Gang,WANG Deyong,ZHAI Songtao.Acoustic emission characteristics of sandstone after high temperature under uniaxial compression[J].Rock and Soil Mechanics,2012,33(11):3 237-3 242.(in Chinese))
[10]周思孟.复杂岩体若干岩石力学问题[M].北京:中国水利水电出版社,1998:233.(ZHOU Simeng.Some rock mechanics problems in complex rock body[M].Beijing:China Water and Power Press,1998:233.(in Chinese))
[11]胡云华.高应力下花岗岩力学特性试验及本构模型研究[博士学位论文][D].武汉:中国科学院武汉岩土力学研究所,2008.(HUYunhua.Study on mechanical properties of granites under high pressure conditions and its constitutive models[Ph.D.Thesis][D].Wuhan:Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,2008.(in Chinese))
[12]黄书岭.高应力下脆性岩石的力学模型与工程运用研究[博士学位论文][D].武汉:中国科学院武汉岩土力学研究所,2008.(HUANGShuling.Study on mechanical model of brittle rock under high stress condition and its engineering applications[Ph.D.Thesis][D].Wuhan:Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,2008.(in Chinese))
[13]张晓平,王思敬,韩庚友,等.岩石单轴压缩条件下裂纹扩展试验研究——以片状岩石为例[J].岩石力学与工程学报,2011,30(9):1 772-1 781.(ZHANG Xiaoping,WANG Sijing,HAN Gengyou,et al.Crack propagation study of rock based on uniaxial——a case study of schistose rock[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(9):1 772-1 781.(in Chinese))
[14]CAI M,KAISER P K,TASAKA Y,et al.Generalized crack initiation and crack damage stress thresholds of brittle rock masses near underground excavations[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(5):833-847.
[15]NIANDOU H,SHAO J F,HENRY J P.Laboratory investigation of the behaviour of tournemire shale mechanics[J].International Journal of Mechanical Sciences,1997,34(1):3-6.
[16]RAMAMURTHY T.Strength,modulus responses of anisotropicrocks[J].Compressive Rock Engineering,1993,(1):313-329.