含预制椭圆形孔洞砂岩强度及破坏特征试验研究
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摘要
通过对含预制椭圆形孔洞板状砂岩试样进行单轴压缩试验,研究了椭圆长轴与短轴之比k及石膏充填作用对岩样强度和破坏特征的影响规律.研究表明,含孔洞岩样的强度和变形参数相对于完整试样均有不同程度的降低,而石膏充填后试样的峰值强度和弹性模量均有所提高,但峰值应变无明显变化规律;无论充填与否,试样峰值强度均随着k值的增加均呈指数形式降低;充填作用对岩样宏观破坏模式无明显影响,岩样最终均以剪切破坏为主,主破裂面沿对角线分布;相对于无充填的岩样,石膏充填后的岩样破坏时宏观裂隙数目增多,破坏程度加剧.
By conducting uniaxial compression experiments on platy sandstone samples containing prefabricated elliptical holes,the effects of k,the ratio of long axis and short axis of ellipse hole,and filling of gypsum on the strength as well as deformation characteristics of rock samples were studied.The results show that the strength and deformation properties of sandstones containing elliptical holes are significantly lower than those of intact ones.The filling of gypsum enhances the peak strength and elastic modulus of sandstones with elliptical holes,while their peak strains vary irregularly with the filling effect.The peak strength of rock samples,whether having been filled with gypsum or not,declines gradually with the increase of k in a form of exponential function.Filling effect shows little impact on final failure modes of sandstones.The final failure mode of all sandstones is characterized by shear failure and the main crack distributes along the diagonal of rock sample.Compared to sandstone samples without filling,the amounts of main cracks of those being filled with gypsum is much larger,and correspondingly their failure degree is much more intense.
By conducting uniaxial compression experiments on platy sandstone samples containing prefabricated elliptical holes,the effects of k,the ratio of long axis and short axis of ellipse hole,and filling of gypsum on the strength as well as deformation characteristics of rock samples were studied.The results show that the strength and deformation properties of sandstones containing elliptical holes are significantly lower than those of intact ones.The filling of gypsum enhances the peak strength and elastic modulus of sandstones with elliptical holes,while their peak strains vary irregularly with the filling effect.The peak strength of rock samples,whether having been filled with gypsum or not,declines gradually with the increase of k in a form of exponential function.Filling effect shows little impact on final failure modes of sandstones.The final failure mode of all sandstones is characterized by shear failure and the main crack distributes along the diagonal of rock sample.Compared to sandstone samples without filling,the amounts of main cracks of those being filled with gypsum is much larger,and correspondingly their failure degree is much more intense.
引文
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[18]李贺,尹光志,许江,等.岩石断裂力学[M].重庆:重庆大学出版社,1988:92-100.
[19]袁小平,刘红岩,王志乔.单轴压缩非贯通节理岩石尖端塑性区及弹塑性断裂模型研究[J].岩土力学,2012,33(6):1679-1688.YUAN Xiaoping,LIU Hongyan,WANG Zhiqiao.Crack tip plastic zone and elastoplastic fracture model for nonpenetrating jointed rock mass under uniaxial compression[J].Rock and Soil Mechanics,2012,33(6):1679-1688.
[20]郭佳奇,乔春生.椭圆孔口塑性区及其在岩溶隧道工程中的应用[J].铁道学报,2013,35(3):108-114.GUO Jiaqi,QIAO Chunsheng.Plastic zone around elliptical hole portal and its application in karst tunnel[J].Journal of the China Railway Society,2013,35(3):108-114.
[21]赵洪辉,靖洪文,苏海健,等.含共面裂隙群砂岩强度与破裂特征的试验研究[J].工程力学,2015,35(2):183-189.ZHAO Honghui,JING Hongwen,SU Haijian,et al.Strength and fracture characteristics of sandstone containing coplanar fissure group[J].Engineering Mechanics,2015,35(2):183-189.
[2]张慧梅,雷利娜,杨更社.等围压条件下岩石本构模型及损伤特性[J].中国矿业大学学报,2015,44(1):59-63.ZHANG Huimei,LEI Lina,YANG Gengshe.Characteristic and representative model of rock damage process under constant confining stress[J].Journal of China University of Mining&Technology,2015,44(1):59-63.
[3]BAUD P,WONG T F,WEI Z.Effects of porosity and crack density on the compressive strength of rocks[J].International Journal of Rock Mechanics and Mining Sciences,2014,67(4):202-211.
[4]JING H W,YANG S Q,ZHANG M L,et al.An experimental study on anchorage strength and deformation behavior of large-scale jointed rock mass[J].Tunnelling and Underground Space Technology,2014,43(7):184-197.
[5]ZONG Y J,HAN L J,QU T,et al.Mechanical properties and failure characteristics of fractured sandstone with grouting and anchorage[J].International Journal of Mining Science&Technology,2014,24(2):165-170.
[6]YIN P,WONG R,CHAU K.Coalescence of two parallel pre-existing surface cracks in granite[J].International Journal of Rock Mechanics and Mining Sciences,2014;68(6):66-84.
[7]张波,李术才,杨学英,等.含交叉裂隙节理岩体锚固效应及破坏模式[J].岩石力学与工程学报,2014,33(5):996-1003.ZHANG Bo,LI Shucai,YANG Xueying,et al.Bolting effect and failure modes of jointed rock masses with cross-cracks[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(5):996-1003.
[8]刘欣宇,刘爱华,李夕兵.充填柱状节理类岩石材料的试验研究[J].岩石力学与工程学报,2014,33(4):772-777.LIU Xinyu,LIU Aihua,LI Xibing.Experimental study of columnar jointed sandstone-like material with preset filling[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(4):772-777.
[9]王瑞红,李建林,蒋昱州,等.含预制节理岩体卸荷条件下力学特性试验研究[J].岩土力学,2012,32(11):3257-3262.WANG Ruihong,LI Jianlin,JIANG Yuzhou,et al.Experimental research on mechanical property of rock mass with prefabricated joints under unloading condition[J].Rock and Soil Mechanics,2012,32(11):3257-3262.
[10]刘红岩,黄妤诗,李楷兵,等.预制节理岩体试件强度及破坏模式的试验研究[J].岩土力学,2013,34(5):1235-1246.LIU Hongyan,HUANG Yushi,LI Kaibing,et al.The study of strength and failure mode of pre-existing jointed rock mass[J].Rock and Soil Mechanics,2013,34(5):1235-1246.
[11]苏海健,靖洪文,赵洪辉,等.纵向裂隙对砂岩力学特性影响试验研究[J].采矿与安全工程学报,2014,31(4):644-649.SU Haijian,JING Hongwen,ZHAO Honghui,et al.Experimental study on the influence of longitudinal fissure on mechanics characteristic of sandstone[J].Journal of Mining and Safety Engineering,2014,31(4):644-649.
[12]杨圣奇,黄彦华,刘相如.断续双裂隙岩石抗拉强度与裂纹扩展颗粒流分析[J].中国矿业大学学报,2014,43(2):220-226.YANG Shengqi,HUANG Yanhua,LIU Xiangru.Particle flow analysis on tensile strength and crack coalescence behavior of brittle rock containing two pre-existing fissures[J].Journal of China University of Mining&Technology,2014,43(2):220-226.
[13]谢林茂,朱万成,王述红,等.含孔洞岩石试样三维破裂过程的并行计算分析[J].岩土工程学报,2011,33(9):1447-1456.XIE Linmao,ZHU Wancheng,WANG Shuhong,et al.Three-Dimensional parallel computing on failure process of rock specimen with a pre-existing circular opening[J].Chinese Journal of Geotechnical Engineering,2011,33(9):1447-1456.
[14]刘招伟,李元海.含孔洞岩石单轴压缩下变形破裂规律的实验研究[J].工程力学,2010,27(8):133-139.LIU Zhaowei,LI Yuanhai.Experimental investigation on the deformation and crack behavior of rock specimen with a hole undergoing uniaxial compression load[J].Engineering Mechanics,2010,27(8):133-139.
[15]杨圣奇,吕朝辉,渠涛.含单个孔洞大理岩裂纹扩展细观试验和模拟[J].中国矿业大学学报,2009,38(6):774-781.YANG Shengqi,LChaohui,QU Tao.Investigation of crack expansion in marble having a single pre-existing hole:experiment and simulations[J].Journal of China University of Mining&Technology,2009,38(6):774-781.
[16]段进超,唐春安,常旭,等.单轴压缩下含孔脆性材料的力学行为研究[J].岩土力学,2006,27(8):1416-1420.DUAN Jinchao,TANG Chunan,CHANG Xu,et al.Study on mechanics behavior of containing holes in brittle material subjected to uniaxial compression[J].Rock and Soil Mechanics,2006,27(8):1416-1420.
[17]陈新,彭曦,李东威,等.基于两种破裂判据的裂隙岩体单轴压缩起裂分析[J].工程力学,2013,30(10):227-235.CHEN Xin,PENG Xi,LI Dongwei,et al.Analysis on cracking mechanism of fractured rock masses under uniaxial compression based on the two cracking criteria[J].Engineering Mechanics,2013,30(10):227-235.
[18]李贺,尹光志,许江,等.岩石断裂力学[M].重庆:重庆大学出版社,1988:92-100.
[19]袁小平,刘红岩,王志乔.单轴压缩非贯通节理岩石尖端塑性区及弹塑性断裂模型研究[J].岩土力学,2012,33(6):1679-1688.YUAN Xiaoping,LIU Hongyan,WANG Zhiqiao.Crack tip plastic zone and elastoplastic fracture model for nonpenetrating jointed rock mass under uniaxial compression[J].Rock and Soil Mechanics,2012,33(6):1679-1688.
[20]郭佳奇,乔春生.椭圆孔口塑性区及其在岩溶隧道工程中的应用[J].铁道学报,2013,35(3):108-114.GUO Jiaqi,QIAO Chunsheng.Plastic zone around elliptical hole portal and its application in karst tunnel[J].Journal of the China Railway Society,2013,35(3):108-114.
[21]赵洪辉,靖洪文,苏海健,等.含共面裂隙群砂岩强度与破裂特征的试验研究[J].工程力学,2015,35(2):183-189.ZHAO Honghui,JING Hongwen,SU Haijian,et al.Strength and fracture characteristics of sandstone containing coplanar fissure group[J].Engineering Mechanics,2015,35(2):183-189.