高应变率下饱水冻结红砂岩变形破坏分析
|
摘要
以白垩系红砂岩为研究对象,利用SHPB动态冲击试验,研究低温状态下红砂岩的变形破坏和能量传递规律,分析不同程度负温对岩石强度性能、损伤变量及能量耗散规律的影响;通过引入分形维数D,建立冻结红砂岩块度分形计算模型,探究块度分形维数与破碎断裂能之间的关系。研究结果表明,饱水红砂岩在低温状态下的动态强度随温度降低(25℃～-40℃)呈先增大后减小的趋势,这与单轴实验中岩石强度随温度降低逐渐增大的趋势有着较大的差异,而随着温度的降低,红砂岩张拉破裂面积先增大而减小,这说明饱水冻结红砂岩破坏模式由张拉破坏向剪切破坏逐步过渡;冻结岩石试件的宏观破坏与破碎断裂能W_(FD)有着密切的关系,破碎断裂能W_(FD)越大,破碎体数量越多,岩石破坏越严重,而破碎断裂能W_(FD)与分形维数D正相关,破碎过程中耗散的断裂能越多,相应的分形维数就越大,但分形维数D随破坏断裂能W_(FD)增加的速率逐渐放缓。
In order to study the energy transfer rule and deformation regularity of the cretaceous red sandstone,dynamic impact compression test was implemented by 75 mm large diameter SHPB experimental device,the influence of negative temperature change on dynamic strength performance,damage variable and the law of energy dissipation has been analyzed. Meanwhile,the fractal dimension D is introduced to set up the frozen red sandstone blocks broken fractal calculation model,and the relationship between fractal dimension D and fracture energy could be revealed. The results show that dynamic strength of saturated red sandstone under low temperature firstly increases and then decreases with the temperature reduction(25℃–-40℃),it is very different from the uniaxial experiment results. With the temperature reduced,the tensile fracture area of red sandstone increased initially and then decreased,which indicates that the failure mode is gradually transitioning from tensile failure to shear failure. There is a close relationship between macroscopic failure characteristics and energy absorption,the greater the dissipated energy,the more serious the rock damage. The fracture energy W_(FD) is positively related to the fractal dimension D,the more fracture energy during the process of crushing,the more serious the damage degree,and the number value of corresponding fractal dimension D is bigger,but the growth rate of fractal dimension D is gradually slowing down with the increase of fracture energy W_(FD).
In order to study the energy transfer rule and deformation regularity of the cretaceous red sandstone,dynamic impact compression test was implemented by 75 mm large diameter SHPB experimental device,the influence of negative temperature change on dynamic strength performance,damage variable and the law of energy dissipation has been analyzed. Meanwhile,the fractal dimension D is introduced to set up the frozen red sandstone blocks broken fractal calculation model,and the relationship between fractal dimension D and fracture energy could be revealed. The results show that dynamic strength of saturated red sandstone under low temperature firstly increases and then decreases with the temperature reduction(25℃–-40℃),it is very different from the uniaxial experiment results. With the temperature reduced,the tensile fracture area of red sandstone increased initially and then decreased,which indicates that the failure mode is gradually transitioning from tensile failure to shear failure. There is a close relationship between macroscopic failure characteristics and energy absorption,the greater the dissipated energy,the more serious the rock damage. The fracture energy W_(FD) is positively related to the fractal dimension D,the more fracture energy during the process of crushing,the more serious the damage degree,and the number value of corresponding fractal dimension D is bigger,but the growth rate of fractal dimension D is gradually slowing down with the increase of fracture energy W_(FD).
引文
[1]刘泉声,黄诗冰,康永水,等.裂隙岩体冻融损伤研究进展与思考[J].岩石力学与工程学报,2015,24(3):452-471.(LIUQuansheng,HUANG Shibing,KANG Yongshui,et al.Advance and review on freezing-thawing damage of fractured rock[J].Chinese Journal of Rock Mechanics and Engineering,2015,24(3):452-471.(in Chinese))
[2]陈卫忠,谭贤君,于洪丹,等.低温及冻融环境下岩体热、水、力特性研究进展与思考[J].岩石力学与工程学报,2011,30(7):1 318-1 336.(CHEN Weizhong,TAN Xianjun,YU Hongdan,et al.Advance and review on thermo-hydro-mechanical characteristics of rock mass under condition of low temperature and freeze-thaw cycles[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(7):1 318-1 336.(in Chinese))
[3]AOKI K,HIBIYA K,YOSHIDA T.Storage of refrigerated liquefied gases in rock caverns:characteristics of rock under very low temperatures[J].Tunnelling and Underground Space Technology,1990,5(4):319-325.
[4]YAMABE T,NEAUPANE K M.Determination of some thermomechanical properties of Sirahama sandstone under subzero temperature condition[J].International Journal of Rock Mechanics and Mining Sciences,2001,38(7):1 029-1 034.
[5]DWIVEDI R D,SONI A K,GOEL R K,et al.Fracture toughness of rocks under sub-zero temperature conditions[J].International Journal of Rock Mechanics and Mining Sciences,2000,37(8):1 267-1 275.
[6]唐明明,王芝银,孙毅力,等.低温条件下花岗岩力学特性试验研究[J].岩石力学与工程学报,2010,29(4):787-794.(TANGMingming,WANG Zhiyin,SUN Yili,et al.Experimental study of mechanical properties of granite under low temperature[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(4):787-794.(in Chinese))
[7]奚家米,杨更社,庞磊,等.低温冻结作用下砂质泥岩基本力学特性试验研究[J].煤炭学报,2014,39(7):1 262-1 268.(XI Jiami,YANG Gengshe,PANG Lei,et al.Experimental study on basic mechanical behaviors of sandy mudstone under low freezing temperature[J].Journal of China Coal Society,2014,39(7):1 262-1 268.(in Chinese))
[8]徐光苗,刘泉声,彭万巍,等.低温作用下岩石基本力学性质试验研究[J].岩石力学与工程学报,2006,25(12):2 502-2 508.(XUGuangmiao,LIU Quansheng,PENG Wanwei,et al.Experimental study on basic mechanical behaviors of rocks under low temperatures[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(12):2 502-2 508.(in Chinese))
[9]杨更社,吕晓涛.富水基岩井筒冻结壁砂质泥岩力学特性试验研究[J].采矿与安全工程学报,2012,29(4):492-496.(YANGGengshe,LV Xiaotao.Experimental study on the sandy mudstone mechanical properties of shaft sidewalls under the frozen conditions[J].Journal of Mining and Safety Engineering,2012,29(4):492-496.(in Chinese))
[10]杨更社,奚家米,李慧军,等.煤矿立井井筒冻结壁软岩力学特性试验研究[J].地下空间与工程学报,2012,8(4):690-697.(YANGGenshe,XI Jiami,LI Huijun,et al.Experimental study on the mechanical properties of soft rock of coal mine shaft sidewalls under the frozen conditions[J].Chinese Journal of Underground Space and Engineering,2012,8(4):690-697.(in Chinese))
[11]单仁亮,杨昊,张晋勋,等.梅林庙矿负温饱水红砂岩加卸载力学特性研究[J].采矿与安全工程学报,2016,33(5):924-931.(SHAN Renliang,YANG Hao,ZHANG Jinxun,et al.Mechanical properties of saturated red sandstone of Meilinmiao mine under loading and unloading at negative temperatures[J].Journal of Mining and Safety Engineering,2016,33(5):924-931.(in Chinese))
[12]单仁亮,杨昊,郭志明,等.负温饱水红砂岩三轴压缩强度特性试验研究[J].岩石力学与工程学报,2014,33(增2):3 657-3 664.(SHAN Renliang,YANG Hao,GUO Zhiming,et al.Experimental study of strength characters of saturated red sandstone on negative temperature under triaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(Supp.2):3 657-3 664.(in Chinese))
[13]单仁亮,张蕾,杨昊,等.饱水红砂岩冻融特性试验研究[J].中国矿业大学学报,2016,45(5):923-929.(SHAN Renliang,ZHANGLei,YANG Hao,et al.Experimental study of freeze-thaw properties of saturated red sandstone[J].Journal of China University of Mining and Technology,2016,45(5):923-929.(in Chinese))
[14]李慧军.冻结条件下岩石力学特性的实验研究[硕士学位论文][D].西安:西安科技大学,2009.(LI Huijun.Experimental study on rock mechanical properties under freezing conditions[M.S.Thesis][D].Xi?an:Xi?an University of Science and Technology,2009.(in Chinese))
[15]程磊.冻结条件下岩石力学特性实验研究及工程应用[硕士学位论文][D].西安:西安科技大学,2009.(CHENG Lei.Experimental study on rock mechanical properties under freezing conditions and application in project[M.S.Thesis][D].Xi?an:Xi?an University of Science and Technology,2009.(in Chinese))
[16]奚家米,杨更社,董西好.冻结温度对砂质泥岩力学特性的影响[J].长安大学学报,2014,34(4):92-97.(XI Jiami,YANG Gengshe,DONG Xihao.Effect of freezing temperature on mechanical properties of sandy mudstone[J].Journal of Chang?an University,2014,34(4):92-97.(in Chinese))
[17]李云鹏,王芝银.岩石低温单轴压缩力学特性[J].北京科技大学学报,2011,33(6):671-675.(LI Yunpeng,WANG Zhiyin.Uniaxial compressive mechanical properties of rock at low temperature[J].Journal of University of Science and Technology Beijing,2011,33(6):671-675.(in Chinese))
[18]许金余,范建设,吕晓聪.围压条件下岩石的动态力学特性[M].西安:西北工业大学出版社,2012:32-67.(XU Jinyu,FAN Jianshe,LV Xiaocong.Dynamic mechanical properties of rock with the confining pressure[M].Xi′an:Northwestern Polytechnical University Press,2012:32-67.(in Chinese))
[19]谢和平,高峰,周宏伟.岩石断裂和破碎分形研究[J].防灾减灾工程学报,2003,3(4):1-9.(XIE Heping,GAO Feng,ZHOU Hongwei.Research of rock fracture and fracture fractal[J].Journal of Disaster Prevention and Mitigation Engineering,2003,3(4):1-9.(in Chinese))
[20]钱烨.基于分形理论的节理岩体爆破块度试验研究[硕士学位论文][D].武汉:武汉理工大学,2005.(QIAN Ye.Experimental study on blasting fragment-size of joints rock mass based on fractal theory[M.S.Thesis][D].Wuhan:Wuhan University of Technology,2005.(in Chinese))
[2]陈卫忠,谭贤君,于洪丹,等.低温及冻融环境下岩体热、水、力特性研究进展与思考[J].岩石力学与工程学报,2011,30(7):1 318-1 336.(CHEN Weizhong,TAN Xianjun,YU Hongdan,et al.Advance and review on thermo-hydro-mechanical characteristics of rock mass under condition of low temperature and freeze-thaw cycles[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(7):1 318-1 336.(in Chinese))
[3]AOKI K,HIBIYA K,YOSHIDA T.Storage of refrigerated liquefied gases in rock caverns:characteristics of rock under very low temperatures[J].Tunnelling and Underground Space Technology,1990,5(4):319-325.
[4]YAMABE T,NEAUPANE K M.Determination of some thermomechanical properties of Sirahama sandstone under subzero temperature condition[J].International Journal of Rock Mechanics and Mining Sciences,2001,38(7):1 029-1 034.
[5]DWIVEDI R D,SONI A K,GOEL R K,et al.Fracture toughness of rocks under sub-zero temperature conditions[J].International Journal of Rock Mechanics and Mining Sciences,2000,37(8):1 267-1 275.
[6]唐明明,王芝银,孙毅力,等.低温条件下花岗岩力学特性试验研究[J].岩石力学与工程学报,2010,29(4):787-794.(TANGMingming,WANG Zhiyin,SUN Yili,et al.Experimental study of mechanical properties of granite under low temperature[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(4):787-794.(in Chinese))
[7]奚家米,杨更社,庞磊,等.低温冻结作用下砂质泥岩基本力学特性试验研究[J].煤炭学报,2014,39(7):1 262-1 268.(XI Jiami,YANG Gengshe,PANG Lei,et al.Experimental study on basic mechanical behaviors of sandy mudstone under low freezing temperature[J].Journal of China Coal Society,2014,39(7):1 262-1 268.(in Chinese))
[8]徐光苗,刘泉声,彭万巍,等.低温作用下岩石基本力学性质试验研究[J].岩石力学与工程学报,2006,25(12):2 502-2 508.(XUGuangmiao,LIU Quansheng,PENG Wanwei,et al.Experimental study on basic mechanical behaviors of rocks under low temperatures[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(12):2 502-2 508.(in Chinese))
[9]杨更社,吕晓涛.富水基岩井筒冻结壁砂质泥岩力学特性试验研究[J].采矿与安全工程学报,2012,29(4):492-496.(YANGGengshe,LV Xiaotao.Experimental study on the sandy mudstone mechanical properties of shaft sidewalls under the frozen conditions[J].Journal of Mining and Safety Engineering,2012,29(4):492-496.(in Chinese))
[10]杨更社,奚家米,李慧军,等.煤矿立井井筒冻结壁软岩力学特性试验研究[J].地下空间与工程学报,2012,8(4):690-697.(YANGGenshe,XI Jiami,LI Huijun,et al.Experimental study on the mechanical properties of soft rock of coal mine shaft sidewalls under the frozen conditions[J].Chinese Journal of Underground Space and Engineering,2012,8(4):690-697.(in Chinese))
[11]单仁亮,杨昊,张晋勋,等.梅林庙矿负温饱水红砂岩加卸载力学特性研究[J].采矿与安全工程学报,2016,33(5):924-931.(SHAN Renliang,YANG Hao,ZHANG Jinxun,et al.Mechanical properties of saturated red sandstone of Meilinmiao mine under loading and unloading at negative temperatures[J].Journal of Mining and Safety Engineering,2016,33(5):924-931.(in Chinese))
[12]单仁亮,杨昊,郭志明,等.负温饱水红砂岩三轴压缩强度特性试验研究[J].岩石力学与工程学报,2014,33(增2):3 657-3 664.(SHAN Renliang,YANG Hao,GUO Zhiming,et al.Experimental study of strength characters of saturated red sandstone on negative temperature under triaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(Supp.2):3 657-3 664.(in Chinese))
[13]单仁亮,张蕾,杨昊,等.饱水红砂岩冻融特性试验研究[J].中国矿业大学学报,2016,45(5):923-929.(SHAN Renliang,ZHANGLei,YANG Hao,et al.Experimental study of freeze-thaw properties of saturated red sandstone[J].Journal of China University of Mining and Technology,2016,45(5):923-929.(in Chinese))
[14]李慧军.冻结条件下岩石力学特性的实验研究[硕士学位论文][D].西安:西安科技大学,2009.(LI Huijun.Experimental study on rock mechanical properties under freezing conditions[M.S.Thesis][D].Xi?an:Xi?an University of Science and Technology,2009.(in Chinese))
[15]程磊.冻结条件下岩石力学特性实验研究及工程应用[硕士学位论文][D].西安:西安科技大学,2009.(CHENG Lei.Experimental study on rock mechanical properties under freezing conditions and application in project[M.S.Thesis][D].Xi?an:Xi?an University of Science and Technology,2009.(in Chinese))
[16]奚家米,杨更社,董西好.冻结温度对砂质泥岩力学特性的影响[J].长安大学学报,2014,34(4):92-97.(XI Jiami,YANG Gengshe,DONG Xihao.Effect of freezing temperature on mechanical properties of sandy mudstone[J].Journal of Chang?an University,2014,34(4):92-97.(in Chinese))
[17]李云鹏,王芝银.岩石低温单轴压缩力学特性[J].北京科技大学学报,2011,33(6):671-675.(LI Yunpeng,WANG Zhiyin.Uniaxial compressive mechanical properties of rock at low temperature[J].Journal of University of Science and Technology Beijing,2011,33(6):671-675.(in Chinese))
[18]许金余,范建设,吕晓聪.围压条件下岩石的动态力学特性[M].西安:西北工业大学出版社,2012:32-67.(XU Jinyu,FAN Jianshe,LV Xiaocong.Dynamic mechanical properties of rock with the confining pressure[M].Xi′an:Northwestern Polytechnical University Press,2012:32-67.(in Chinese))
[19]谢和平,高峰,周宏伟.岩石断裂和破碎分形研究[J].防灾减灾工程学报,2003,3(4):1-9.(XIE Heping,GAO Feng,ZHOU Hongwei.Research of rock fracture and fracture fractal[J].Journal of Disaster Prevention and Mitigation Engineering,2003,3(4):1-9.(in Chinese))
[20]钱烨.基于分形理论的节理岩体爆破块度试验研究[硕士学位论文][D].武汉:武汉理工大学,2005.(QIAN Ye.Experimental study on blasting fragment-size of joints rock mass based on fractal theory[M.S.Thesis][D].Wuhan:Wuhan University of Technology,2005.(in Chinese))