裂隙对含孔洞砂岩力学及损伤演化特征的影响
|
摘要
为研究裂隙对含孔洞岩体力学及损伤演化特征影响,利用颗粒流模拟程序,对存在不同裂隙形态的含孔洞岩样在单轴压缩下的力学性质进行数值试验研究,分析岩样破裂与力学特征随裂隙形态的变化情况,对其损伤演化特性进行探讨。研究结果表明:裂隙的存在会改变原有含孔洞岩样沿孔洞贯通的破坏模式,大多数岩样会形成贯通裂隙的主破裂带;但当裂隙存在于距原主破裂带较远,且倾角较大或长度较小时,岩样依沿孔洞形成主破裂带;岩样的峰值应力随裂隙距孔洞距离或裂隙倾角的增大而增大,随裂隙长度的增大逐渐减小;含孔洞岩样周边存在距孔洞距离越远,长度越大的裂隙,在相同应变下损伤越小;含孔洞岩样的损伤修正系数取值为0.77～0.90。
In order to study the effect of fissure on the mechanics and damage evolution characteristics of rock containing hole defect, the mechanical behavior of sandstone containing hole defect with different fissure morphologies was tested under uniaxial compression conditions by using the particle flow simulation program. The fracture and mechanics characteristics of rock samples were analyzed with the changes of fissure morphology. The damage evolution characteristics of rock samples were discussed. The results show that the presence of fissures will change the fracture pattern of the original rock sample containing hole defect along the hole defect and most of the rock samples will form the main fractured by the fissure. For fissure that is relatively far away from the original main fracture belt and has a larger angle or a smaller length, the rock sample is still fractured along the hole defect. The peak stress increases with the increase of the distance from the fissure to the hole defect and it increases with the increase of the fissure angle. The peak stress of the rock sample gradually decreases with the increase of fissure length. For fissure that is further away from the hole defect and has greater length, the damage is smaller at the same strain. The damage correction coefficients are0.77–0.90 for rock samples containing hole defect.
In order to study the effect of fissure on the mechanics and damage evolution characteristics of rock containing hole defect, the mechanical behavior of sandstone containing hole defect with different fissure morphologies was tested under uniaxial compression conditions by using the particle flow simulation program. The fracture and mechanics characteristics of rock samples were analyzed with the changes of fissure morphology. The damage evolution characteristics of rock samples were discussed. The results show that the presence of fissures will change the fracture pattern of the original rock sample containing hole defect along the hole defect and most of the rock samples will form the main fractured by the fissure. For fissure that is relatively far away from the original main fracture belt and has a larger angle or a smaller length, the rock sample is still fractured along the hole defect. The peak stress increases with the increase of the distance from the fissure to the hole defect and it increases with the increase of the fissure angle. The peak stress of the rock sample gradually decreases with the increase of fissure length. For fissure that is further away from the hole defect and has greater length, the damage is smaller at the same strain. The damage correction coefficients are0.77–0.90 for rock samples containing hole defect.
引文
[1]CHEN Minliang,JING Hongwen,MA Xiujun,et al.Fracture evolution characteristics of sandstone containing double fissures and a single circular hole under uniaxial compression[J].International Journal of Mining Science and Technology,2017,27(3):499-505.
[2]刘学伟,刘泉声,陈元,等.裂隙形式对岩体强度特征及破坏模式影响的试验研究[J].岩土力学,2015,36(S2):208-214.LIU Xuewei,LIU Quansheng,CHEN Yuan,et al.Experimental study of effects of fracture type on strength characteristics and failure modes of fractured rock mass[J].Rock and Soil Mechanics,2015,36(S2):208-214.
[3]YANG Shengqi,HUANG Yanhua,JING Hongwen,et al.Discrete element modeling on fracture coalescence behavior of red sandstone containing two unparallel fissures[J].Engineering Geology,2014,178(6):28-48.
[4]YANG Shengqi,JING Hongwen,XU Tao.Mechanical behavior and failure analysis of brittle sandstone specimens containing combined flaws under uniaxial compression[J].Journal of Central South University,2014,21(5):2059-2073.
[5]LEE H,JEON S.An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression[J].International Journal of Solids&Structures,2011,48(6):979-999.
[6]YANG S Q,DAI Y H,HAN L J,et al.Experimental study on mechanical behavior of brittle marble samples containing different flaws under uniaxial compression[J].Engineering Fracture Mechanics,2009,76(12):1833-1845.
[7]LAJTAI E Z,LAJTAI V N.The collapse of cavities[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts,1975,12(4):81-86.
[8]WANG Xiao,TIAN Longgang.Mechanical and crack evolution characteristics of coal-rock under different fracture-hole conditions:a numerical study based on particle flow code[J].Environmental Earth Sciences,2018,77(8):297.
[9]WADLEY H N G,SCRUBY C B,SPEAKE J H.Acoustic emission for physical examination of metals[J].Metallurgical Reviews,2013,25(1):41-64.
[10]周喻,吴顺川,许学良,等.岩石破裂过程中声发射特性的颗粒流分析[J].岩石力学与工程学报,2013,32(5):951-959.ZHOU Yu,WU Shunchuan,XU Xueliang,et al.Particle flow analysis of acoustic emission characteristics during rock failure process[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(5):951-959.
[11]TANG Chunan,XU Xiaohe.Evolution and propagation of material defects and Kaiser effect function[J].Journal of Seismological Research,1990,13(2):203-313.
[12]刘保县,黄敬林,王泽云,等.单轴压缩煤岩损伤演化及声发射特性研究[J].岩石力学与工程学报,2009,28(S1):3234-3238.LIU Baoxian,HUANG Jinglin,WANG Zeyun,et al.Study on damage evolution and acoustic emission character of coal-rock under uniaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(S1):3234-3238.
[13]LI Yinping,CHEN Longzhu,WANG Yuanhan.Experimental research on pre-cracked marble under compression[J].International Journal of Solids&Structures,2005,42(9):2505-2516.
[14]ZHAO Xingdong,ZHANG Hongxun,ZHU Wancheng.Fracture evolution around pre-existing cylindrical cavities in brittle rocks under uniaxial compression[J].Transactions of Nonferrous Metals Society of China,2014,24(3):806-815.
[15]YANG Shengqi,JING Hongwen.Strength failure and crack coalescence behavior of brittle sandstone samples containing a single fissure under uniaxial compression[J].International Journal of Fracture,2011,168(2):227-250.
[16]CUNDALL P A,STRACK O D.A discreate numerical model for granula assemblies[J].Geotechnique,1979,29(1):47-65.
[17]王云飞,黄正均,崔芳.煤岩破坏过程的细观力学损伤演化机制[J].煤炭学报,2014,39(12):2390-2396.WANG Yunfei,HUANG Zhengjun,CUI Fang.Damage evolution mechanism in the failure process of coal rock based on mesomechanics[J].Journal of China Coal Society,2014,39(12):2390-2396.
[18]尹延春,赵同彬,谭云亮,等.基于Otsu图像处理的岩石细观模型重构及数值试验[J].岩土力学,2015,36(9):2532-2540.YIN Yanchun,ZHAO Tongbin,TAN Yunliang,et al.Reconstruction and numerical test of the mesoscopic model of rock based on Otsu digital image processing[J].Rock and Soil Mechanics,2015,36(9):2532-2540.
[19]刘学文,林吉中,袁祖贻.应用声发射技术评价材料疲劳损伤的研究[J].中国铁道科学,1997,18(4):74-81.LIU Xuewen,LIN Jizhong,YUAN Zuyi.Research on evaluation of material fatigue damage by acoustic emission technology[J].China Railway Science,1997,18(4):74-81.
[20]KACHANOV L M.Rupture time under creep conditions[J].International Journal of Fracture,1999,97(1/2/3/4):11-18.
[21]LEMAITRE J,SERMAGE J P,DESMORAT R.A two scale damage concept applied to fatigue[J].International Journal of fracture,1999,97(1):67-81.
[2]刘学伟,刘泉声,陈元,等.裂隙形式对岩体强度特征及破坏模式影响的试验研究[J].岩土力学,2015,36(S2):208-214.LIU Xuewei,LIU Quansheng,CHEN Yuan,et al.Experimental study of effects of fracture type on strength characteristics and failure modes of fractured rock mass[J].Rock and Soil Mechanics,2015,36(S2):208-214.
[3]YANG Shengqi,HUANG Yanhua,JING Hongwen,et al.Discrete element modeling on fracture coalescence behavior of red sandstone containing two unparallel fissures[J].Engineering Geology,2014,178(6):28-48.
[4]YANG Shengqi,JING Hongwen,XU Tao.Mechanical behavior and failure analysis of brittle sandstone specimens containing combined flaws under uniaxial compression[J].Journal of Central South University,2014,21(5):2059-2073.
[5]LEE H,JEON S.An experimental and numerical study of fracture coalescence in pre-cracked specimens under uniaxial compression[J].International Journal of Solids&Structures,2011,48(6):979-999.
[6]YANG S Q,DAI Y H,HAN L J,et al.Experimental study on mechanical behavior of brittle marble samples containing different flaws under uniaxial compression[J].Engineering Fracture Mechanics,2009,76(12):1833-1845.
[7]LAJTAI E Z,LAJTAI V N.The collapse of cavities[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts,1975,12(4):81-86.
[8]WANG Xiao,TIAN Longgang.Mechanical and crack evolution characteristics of coal-rock under different fracture-hole conditions:a numerical study based on particle flow code[J].Environmental Earth Sciences,2018,77(8):297.
[9]WADLEY H N G,SCRUBY C B,SPEAKE J H.Acoustic emission for physical examination of metals[J].Metallurgical Reviews,2013,25(1):41-64.
[10]周喻,吴顺川,许学良,等.岩石破裂过程中声发射特性的颗粒流分析[J].岩石力学与工程学报,2013,32(5):951-959.ZHOU Yu,WU Shunchuan,XU Xueliang,et al.Particle flow analysis of acoustic emission characteristics during rock failure process[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(5):951-959.
[11]TANG Chunan,XU Xiaohe.Evolution and propagation of material defects and Kaiser effect function[J].Journal of Seismological Research,1990,13(2):203-313.
[12]刘保县,黄敬林,王泽云,等.单轴压缩煤岩损伤演化及声发射特性研究[J].岩石力学与工程学报,2009,28(S1):3234-3238.LIU Baoxian,HUANG Jinglin,WANG Zeyun,et al.Study on damage evolution and acoustic emission character of coal-rock under uniaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(S1):3234-3238.
[13]LI Yinping,CHEN Longzhu,WANG Yuanhan.Experimental research on pre-cracked marble under compression[J].International Journal of Solids&Structures,2005,42(9):2505-2516.
[14]ZHAO Xingdong,ZHANG Hongxun,ZHU Wancheng.Fracture evolution around pre-existing cylindrical cavities in brittle rocks under uniaxial compression[J].Transactions of Nonferrous Metals Society of China,2014,24(3):806-815.
[15]YANG Shengqi,JING Hongwen.Strength failure and crack coalescence behavior of brittle sandstone samples containing a single fissure under uniaxial compression[J].International Journal of Fracture,2011,168(2):227-250.
[16]CUNDALL P A,STRACK O D.A discreate numerical model for granula assemblies[J].Geotechnique,1979,29(1):47-65.
[17]王云飞,黄正均,崔芳.煤岩破坏过程的细观力学损伤演化机制[J].煤炭学报,2014,39(12):2390-2396.WANG Yunfei,HUANG Zhengjun,CUI Fang.Damage evolution mechanism in the failure process of coal rock based on mesomechanics[J].Journal of China Coal Society,2014,39(12):2390-2396.
[18]尹延春,赵同彬,谭云亮,等.基于Otsu图像处理的岩石细观模型重构及数值试验[J].岩土力学,2015,36(9):2532-2540.YIN Yanchun,ZHAO Tongbin,TAN Yunliang,et al.Reconstruction and numerical test of the mesoscopic model of rock based on Otsu digital image processing[J].Rock and Soil Mechanics,2015,36(9):2532-2540.
[19]刘学文,林吉中,袁祖贻.应用声发射技术评价材料疲劳损伤的研究[J].中国铁道科学,1997,18(4):74-81.LIU Xuewen,LIN Jizhong,YUAN Zuyi.Research on evaluation of material fatigue damage by acoustic emission technology[J].China Railway Science,1997,18(4):74-81.
[20]KACHANOV L M.Rupture time under creep conditions[J].International Journal of Fracture,1999,97(1/2/3/4):11-18.
[21]LEMAITRE J,SERMAGE J P,DESMORAT R.A two scale damage concept applied to fatigue[J].International Journal of fracture,1999,97(1):67-81.