裂隙倾角和长度对低强度岩体力学特性及破坏模式影响的试验研究
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摘要
根据不同倾角和长度单裂隙条件下的低强度岩体试件的常规单轴压缩试验结果,详细分析不同倾角和长度单裂隙低强度岩体试件的应力-应变曲线、强度、变形参数及破坏模式。结果表明:1)裂隙倾角和长度将使低强度岩体试件的应力-应变曲线在峰后破坏阶段变为多台阶式下跌,显示出明显的塑性破坏特征; 2)低强度岩体试件的峰值强度随裂隙倾角的减小和长度的增加均呈降低趋势,但受结构效应的影响,随裂隙长度的增加,其减小趋势将逐渐趋于平缓; 3)裂隙倾角和长度均可以影响裂隙变形在试件总变形中的所占比例,进而影响低强度裂隙试件整体弹性模量和轴向峰值应变的大小; 4)裂隙倾角能彻底改变低强度岩体试件的破坏模式,而裂隙长度只能改变试件局部的破坏模式,其对试件整体破坏模式的影响程度远小于裂隙倾角。
Conventional uniaxial compression test on low-strength single fractured specimens with different fissure dig angles and lengths were carried out. Based on the experimental results,the stress-strain curve,strength,deformation parameter and failure mode of various types of low-strength single fractured specimens were analyzed in detail. The main conclusions were drawn as follows: 1) under the influence of fissure dig angle and length,the stress-strain curves of low-strength rock specimens became a multi-step fall in the post-peak failure stage and presented obvious plastic failure characteristics; 2) the peak strength of low-strength rock mass decreased with the decrease of fissure dig angle and the increase of fissure length,however,under the influence of the structural effect of the fissure length,the decreasing trend gradually be steady; 3) the fissure dig angle and length could affect the proportion of fracture deformation in the total deformation of the specimens,and then affect the overall elastic modulus and axial peak strain of low-strength fractured specimens; 4) the fissure dig angle could completely change the failure mode of low-strength rock specimen,while the fissure length could only change the local failure mode of the specimen,and its influence on the whole failure mode of the specimen was far less than the fissure dig angle.
Conventional uniaxial compression test on low-strength single fractured specimens with different fissure dig angles and lengths were carried out. Based on the experimental results,the stress-strain curve,strength,deformation parameter and failure mode of various types of low-strength single fractured specimens were analyzed in detail. The main conclusions were drawn as follows: 1) under the influence of fissure dig angle and length,the stress-strain curves of low-strength rock specimens became a multi-step fall in the post-peak failure stage and presented obvious plastic failure characteristics; 2) the peak strength of low-strength rock mass decreased with the decrease of fissure dig angle and the increase of fissure length,however,under the influence of the structural effect of the fissure length,the decreasing trend gradually be steady; 3) the fissure dig angle and length could affect the proportion of fracture deformation in the total deformation of the specimens,and then affect the overall elastic modulus and axial peak strain of low-strength fractured specimens; 4) the fissure dig angle could completely change the failure mode of low-strength rock specimen,while the fissure length could only change the local failure mode of the specimen,and its influence on the whole failure mode of the specimen was far less than the fissure dig angle.
引文
[1]黄彦华,杨圣奇,鞠杨,等.断续裂隙类岩石材料三轴压缩力学特性试验研究[J].岩土工程学报,2016,38(7):1212-1220.
[2]杨圣奇,戴永浩,韩立军,等.断续预制裂隙脆性大理岩变形破坏特性单轴压缩试验研究[J].岩石力学与工程学报,2009,28(12):2391-2404.
[3]张波,李术才,杨学英,等.含交叉裂隙节理岩体单轴压缩破坏机制研究[J].岩土力学,2014,35(7):1863-1870.
[4]BOMBOLAKIS E G.Photoelastic Study of Initial Stages of Brittle Fracture in Compression[J].Tectonophysics,1968,6(6):461-473.
[5]YANG S Q.Crack Coalescence Behavior of Brittle Sandstone Samples Containing Two Coplanar Fissures in the Process of Deformation Failure[J].Engineering Fracture Mechanics,2011,78(17):3059-3081.
[6]YANG S Q,LIU X R,JING H W.Experimental Investigation on Fracture Coalescence Behavior of Red Sandstone Containing Two Unparallel Fissures Under Uniaxial Compression[J].International Journal of Rock Mechanics&Mining Sciences,2013(63):82-92.
[7]杨圣奇.断续三裂隙砂岩强度破坏和裂纹扩展特征研究[J].岩土力学,2013,34(1):31-39.
[8]肖桃李,李新平,贾善坡.深部单裂隙岩体结构面效应的三轴试验研究与力学分析[J].岩石力学与工程学报,2012,31(8):1666-1673.
[9]肖桃李,李新平,贾善坡.两条断续贯通的预制裂隙岩样破坏特性的三轴压缩试验研究[J].岩石力学与工程学报,2015,34(12):2455-2462.
[10]YANG S Q,JING H W.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.
[11]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].Engingering Fracture Mechanics,2009,76(12):1833-1845.
[12]YANG S Q,JIANG Y Z,XU W Y,et al.Experimental Investigation on Strength and Failure Behavior of Pre-Cracked Marble Under Conventional Triaxial Compression[J].International Journal of Solids and Structure,2008,45(17):4796-4819.
[13]赵延林,万文,王卫军,等.类岩石材料有序多裂纹体单轴压缩破断试验与翼形断裂数值模拟[J].岩土工程学报,2013,35(11):2097-2108.
[14]WANG S Y,SLOAN S W,SHENG D C,et al.Numerical Study of Failure Behaviour of Pre-Cracked Rock Specimens Under Conventional Triaxial Compression[J].International Journal of Solids and Structures,2014,51(5):1132-1148.
[15]黄彦华,杨圣奇.非共面双裂隙红砂岩宏细观力学行为颗粒流模拟[J].岩石力学与工程学报,2014,33(8):1644-1653.
[16]中华人民共和国住房和城乡建设部.工程岩体试验方法标准:GB/T 50266-2013[S].北京:中国建筑工业出版社,2013.
[17]任利,谢和平,谢凌志,等.基于断裂力学的裂隙岩体强度分析初探[J].工程力学,2013,30(2):156-162.
[18]ZHUANG X Y,CHUN J W,ZHU H H.A Comparative Study on Unfilled and Filled Crack Propagation for Rock-Like Brittle Material[J].Theoretical Applying of Fracture Mechanics,2014,72:110-120.
[19]TANG C A,LIN P,WONG R H C,et al.Analysis of Crack Coalescence in Rock-Like Materials Containing Three Flaws,Part II:Numerical Approach[J].International Journal of Rock Mechanics and Minning Science,2001,38(7):925-939.
[2]杨圣奇,戴永浩,韩立军,等.断续预制裂隙脆性大理岩变形破坏特性单轴压缩试验研究[J].岩石力学与工程学报,2009,28(12):2391-2404.
[3]张波,李术才,杨学英,等.含交叉裂隙节理岩体单轴压缩破坏机制研究[J].岩土力学,2014,35(7):1863-1870.
[4]BOMBOLAKIS E G.Photoelastic Study of Initial Stages of Brittle Fracture in Compression[J].Tectonophysics,1968,6(6):461-473.
[5]YANG S Q.Crack Coalescence Behavior of Brittle Sandstone Samples Containing Two Coplanar Fissures in the Process of Deformation Failure[J].Engineering Fracture Mechanics,2011,78(17):3059-3081.
[6]YANG S Q,LIU X R,JING H W.Experimental Investigation on Fracture Coalescence Behavior of Red Sandstone Containing Two Unparallel Fissures Under Uniaxial Compression[J].International Journal of Rock Mechanics&Mining Sciences,2013(63):82-92.
[7]杨圣奇.断续三裂隙砂岩强度破坏和裂纹扩展特征研究[J].岩土力学,2013,34(1):31-39.
[8]肖桃李,李新平,贾善坡.深部单裂隙岩体结构面效应的三轴试验研究与力学分析[J].岩石力学与工程学报,2012,31(8):1666-1673.
[9]肖桃李,李新平,贾善坡.两条断续贯通的预制裂隙岩样破坏特性的三轴压缩试验研究[J].岩石力学与工程学报,2015,34(12):2455-2462.
[10]YANG S Q,JING H W.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.
[11]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].Engingering Fracture Mechanics,2009,76(12):1833-1845.
[12]YANG S Q,JIANG Y Z,XU W Y,et al.Experimental Investigation on Strength and Failure Behavior of Pre-Cracked Marble Under Conventional Triaxial Compression[J].International Journal of Solids and Structure,2008,45(17):4796-4819.
[13]赵延林,万文,王卫军,等.类岩石材料有序多裂纹体单轴压缩破断试验与翼形断裂数值模拟[J].岩土工程学报,2013,35(11):2097-2108.
[14]WANG S Y,SLOAN S W,SHENG D C,et al.Numerical Study of Failure Behaviour of Pre-Cracked Rock Specimens Under Conventional Triaxial Compression[J].International Journal of Solids and Structures,2014,51(5):1132-1148.
[15]黄彦华,杨圣奇.非共面双裂隙红砂岩宏细观力学行为颗粒流模拟[J].岩石力学与工程学报,2014,33(8):1644-1653.
[16]中华人民共和国住房和城乡建设部.工程岩体试验方法标准:GB/T 50266-2013[S].北京:中国建筑工业出版社,2013.
[17]任利,谢和平,谢凌志,等.基于断裂力学的裂隙岩体强度分析初探[J].工程力学,2013,30(2):156-162.
[18]ZHUANG X Y,CHUN J W,ZHU H H.A Comparative Study on Unfilled and Filled Crack Propagation for Rock-Like Brittle Material[J].Theoretical Applying of Fracture Mechanics,2014,72:110-120.
[19]TANG C A,LIN P,WONG R H C,et al.Analysis of Crack Coalescence in Rock-Like Materials Containing Three Flaws,Part II:Numerical Approach[J].International Journal of Rock Mechanics and Minning Science,2001,38(7):925-939.