单试件重复加载法测定岩石残余强度指标
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摘要
在以往单试件法基础上,结合岩石三轴压缩试验残余阶段的变形特点,研究提出了一种单试件重复加载法,测定岩石残余阶段的强度指标。研究结果表明:(1)常规多试件三轴压缩试验和单试件重复加载试验结果对比分析发现,岩样的残余强度主要由加载时的围压控制,与初始加载破坏的围压关系不明显;(2)单试件重复加载法得到的岩样残余阶段的强度指标与常规三轴压缩试验得到的结果基本一致,而且试验结果离散性明显较小,说明该方法是合理可行的;(3)为了更好地运用本文所提出的单试件重复加载法,建议在重复加载时尽量选择较大的围压值,从而保证重复加载过程中岩样的剪切破坏面处于紧密的接触状态,以更好地反映岩样在残余阶段的强度特征。
Based on the single test method and the deformation characteristics of residual phase of rock,a single specimen repeated loading method is proposed to measure the residual strength parameters of the rock.The results show that:(1) By comparing the results of the conventional triaxial tests with those of the single specimen repeated loading tests,the residual strength of rock samples is mainly controlled by the confining pressure of loading,and it is not obviously related with the initial confining pressure;(2) The strength parameters of the residual phase of rock samples obtained by the single specimen repeated loading method are basically consistent with those of the conventional triaxial tests,and the dispersion of the test results is significantly smaller,indicating that the proposed method is reasonable and feasible;(3) In order to better use the proposed single specimen repeated loading method,it is recommended to choose the larger confining pressure during the repeated loading process so as to ensure the shear failure surface of rock samples to be in close contact state,which can reflect the strength characteristics of rock samples in residual phase better.
Based on the single test method and the deformation characteristics of residual phase of rock,a single specimen repeated loading method is proposed to measure the residual strength parameters of the rock.The results show that:(1) By comparing the results of the conventional triaxial tests with those of the single specimen repeated loading tests,the residual strength of rock samples is mainly controlled by the confining pressure of loading,and it is not obviously related with the initial confining pressure;(2) The strength parameters of the residual phase of rock samples obtained by the single specimen repeated loading method are basically consistent with those of the conventional triaxial tests,and the dispersion of the test results is significantly smaller,indicating that the proposed method is reasonable and feasible;(3) In order to better use the proposed single specimen repeated loading method,it is recommended to choose the larger confining pressure during the repeated loading process so as to ensure the shear failure surface of rock samples to be in close contact state,which can reflect the strength characteristics of rock samples in residual phase better.
引文
[1]GB/T 50266-2013工程岩体试验方法标准[S].2013.(GB/T50266-2013 Standard for tests method of engineering rock masses[S].2013.(in Chinese))
[2]尤明庆,华安增,李玉寿.缺陷岩样强度及变形特性的研究[J].岩土工程学报,1998,20(2):97-101.(YOUMing-qing,HUA An-zeng,LI Yu-shou.A study of triaxial strength and deformation of flawed specimen[J].Chinese Journal of Rock Mechanics and Engineering,1998,20(2):97-101.(in Chinese))
[3]邓华锋,李建林,邓成进,等.岩石力学试验中岩样选择和抗压强度预测方法研究[J].岩土力学,2011,32(11):3399-3403.(DENG Hua-feng,LI Jian-lin,DENG Cheng-jin,et al.Analysis of sampling in rock mechanics test and compressive strength prediction methods[J].Rock and Soil Mechanics,2011,32(11):3399-3403.(in Chinese))
[4]邓华锋,王哲,李建林,等.岩石力学试验中缺陷岩样抗压强度修正方法[J].地下空间与工程学报,2017,13(2):307-313.(DENG Hua-feng,WANG Zhe,LI Jian-lin,et al.Compressive strength correction method of flaw sample in rock mechanics test[J].Chinese Journal of Underground Space and Engineering,2017,13(2):307-313.(in Chinese))
[5]KOVARI K,TISA A.Multiple failure state and strain controlled triaxial tests[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts,1975,7(1):17-33.
[6]KOVARI K,TISA A,EINSTEIN H H,et al.Suggested methods for determining the strength of rock materials in triaxial compression:revised version[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts,1983,20(6):283-290.
[7]PETER C,CLEMENT M K,GUY R,et al.Triaxial testing of brittle sandstone using a multiple failure state method[J].Geotechnical Testing Journal,1987,10(4):213-217.
[8]苏承东,尤明庆.单一试样确定大理岩和砂岩强度参数的方法[J].岩石力学与工程学报,2004,23(18):3055-3058.(SU Cheng-dong,YOU Ming-qing.Determination method of strength parameters for sandstone and marble with one specimen[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(18):3055-3058.(in Chinese))
[9]吴玉山,李纪鼎.确定岩石强度包络线的新方法单块法[J].岩土工程学报,1985,7(2):85-91.(WU Yu-shan,LIJi-ding.Single specimen method:a new method to determine the Coulomb curves of rocks[J].Chinese Journal of Geotechnical Engineering,1985,7(2):85-91.(in Chinese))
[10]张磊,王宝学,杨同.岩石三轴多级围压加载试验方法与数据统计分析的研究[J].实验技术与管理,2008,25(2):43-47.(ZHANG Lei,WANG Bao-xue,YANG Tong.The research of rock triaxial compression with multilevel confining pressure and the data statistics[J].Experimental Technology and Management,2008,25(2):43-47.(in Chinese))
[11]程鸿鑫,沈明荣.在普通压力机进行岩石三轴单块试验方法[J].岩石力学与工程学报,1987,6(1):39-46.(CHENGHong-xin,SHEN Ming-rong.Triaxial test of a single block on a common liquid press[J].Chinese Journal of Rock Mechanics and Engineering,1987,6(1):39-46.(in Chinese))
[12]闫明礼,杨志红.单试件测定强度指标的试验研究[J].港口工程,1991(2):13-19.(YAN Ming-li,YANG Zhi-hong.Test study of the strength index of single specimen[J].Port Engineering,1991(2):13-19.(in Chinese))
[13]李宏哲,夏才初,徐崇帮,等.基于多级破坏方法确定岩石卸荷强度参数的试验研究[J].岩石力学与工程学报,2008,27(增刊1):2681-2686.(LI Hong-zhe,XIA Cai-chu,XU Chong-bang,et al.Experimental study of rock unloading strength parameters based on multiple failure method[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(S1):2681-2686.(in Chinese))
[14]徐颖,李振平,葛新.软岩单试件直剪实验方法[J].辽宁工程技术大学学报,2006,25(3):367-368.(XU Ying,LI Zhen-ping,GE Xin.Soft rock single test sample shear experiment methord[J].Journal of Liaoning Technical University,2006,25(3):367-368.(in Chinese))
[15]HOU Y P,SUN T Q.An improved method to make the microdroplet single fiber composite specimen for determining the interfacial shear strength[J].J Mater Sci,2012,47:4775-4778.
[16]YAN K F,ZHANG C Y,QIAO S R,et al.Measurement of in-plane shear strength of carbon/carbon composites by compression of double-notched specimens[J].Journal of Materials Engineering and Performance,2012,21(1):62-68.
[17]刘保国,崔少东.单试件法测定岩石强度参数的修正方法[J].土木工程学报,2011,44(增刊):162-165.(LIUBao-guo,CUI Shao-dong.Improvement of single specimen method for determination of rock strength parameters[J].China Civil Engineering Journal,2011,44(S0):162-165.(in Chinese))
[18]宋晓明.单试件法确定岩石强度参数的特点及改进方法[J].科学技术创新,2016(11):33-34.(SONG Xiao-ming.The characteristics and improvement methods of strength parameters of rock are determined by single test method[J].Heilongjiang Science and Technology Innovation,2016:33-34.(in Chinese))
[2]尤明庆,华安增,李玉寿.缺陷岩样强度及变形特性的研究[J].岩土工程学报,1998,20(2):97-101.(YOUMing-qing,HUA An-zeng,LI Yu-shou.A study of triaxial strength and deformation of flawed specimen[J].Chinese Journal of Rock Mechanics and Engineering,1998,20(2):97-101.(in Chinese))
[3]邓华锋,李建林,邓成进,等.岩石力学试验中岩样选择和抗压强度预测方法研究[J].岩土力学,2011,32(11):3399-3403.(DENG Hua-feng,LI Jian-lin,DENG Cheng-jin,et al.Analysis of sampling in rock mechanics test and compressive strength prediction methods[J].Rock and Soil Mechanics,2011,32(11):3399-3403.(in Chinese))
[4]邓华锋,王哲,李建林,等.岩石力学试验中缺陷岩样抗压强度修正方法[J].地下空间与工程学报,2017,13(2):307-313.(DENG Hua-feng,WANG Zhe,LI Jian-lin,et al.Compressive strength correction method of flaw sample in rock mechanics test[J].Chinese Journal of Underground Space and Engineering,2017,13(2):307-313.(in Chinese))
[5]KOVARI K,TISA A.Multiple failure state and strain controlled triaxial tests[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts,1975,7(1):17-33.
[6]KOVARI K,TISA A,EINSTEIN H H,et al.Suggested methods for determining the strength of rock materials in triaxial compression:revised version[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts,1983,20(6):283-290.
[7]PETER C,CLEMENT M K,GUY R,et al.Triaxial testing of brittle sandstone using a multiple failure state method[J].Geotechnical Testing Journal,1987,10(4):213-217.
[8]苏承东,尤明庆.单一试样确定大理岩和砂岩强度参数的方法[J].岩石力学与工程学报,2004,23(18):3055-3058.(SU Cheng-dong,YOU Ming-qing.Determination method of strength parameters for sandstone and marble with one specimen[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(18):3055-3058.(in Chinese))
[9]吴玉山,李纪鼎.确定岩石强度包络线的新方法单块法[J].岩土工程学报,1985,7(2):85-91.(WU Yu-shan,LIJi-ding.Single specimen method:a new method to determine the Coulomb curves of rocks[J].Chinese Journal of Geotechnical Engineering,1985,7(2):85-91.(in Chinese))
[10]张磊,王宝学,杨同.岩石三轴多级围压加载试验方法与数据统计分析的研究[J].实验技术与管理,2008,25(2):43-47.(ZHANG Lei,WANG Bao-xue,YANG Tong.The research of rock triaxial compression with multilevel confining pressure and the data statistics[J].Experimental Technology and Management,2008,25(2):43-47.(in Chinese))
[11]程鸿鑫,沈明荣.在普通压力机进行岩石三轴单块试验方法[J].岩石力学与工程学报,1987,6(1):39-46.(CHENGHong-xin,SHEN Ming-rong.Triaxial test of a single block on a common liquid press[J].Chinese Journal of Rock Mechanics and Engineering,1987,6(1):39-46.(in Chinese))
[12]闫明礼,杨志红.单试件测定强度指标的试验研究[J].港口工程,1991(2):13-19.(YAN Ming-li,YANG Zhi-hong.Test study of the strength index of single specimen[J].Port Engineering,1991(2):13-19.(in Chinese))
[13]李宏哲,夏才初,徐崇帮,等.基于多级破坏方法确定岩石卸荷强度参数的试验研究[J].岩石力学与工程学报,2008,27(增刊1):2681-2686.(LI Hong-zhe,XIA Cai-chu,XU Chong-bang,et al.Experimental study of rock unloading strength parameters based on multiple failure method[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(S1):2681-2686.(in Chinese))
[14]徐颖,李振平,葛新.软岩单试件直剪实验方法[J].辽宁工程技术大学学报,2006,25(3):367-368.(XU Ying,LI Zhen-ping,GE Xin.Soft rock single test sample shear experiment methord[J].Journal of Liaoning Technical University,2006,25(3):367-368.(in Chinese))
[15]HOU Y P,SUN T Q.An improved method to make the microdroplet single fiber composite specimen for determining the interfacial shear strength[J].J Mater Sci,2012,47:4775-4778.
[16]YAN K F,ZHANG C Y,QIAO S R,et al.Measurement of in-plane shear strength of carbon/carbon composites by compression of double-notched specimens[J].Journal of Materials Engineering and Performance,2012,21(1):62-68.
[17]刘保国,崔少东.单试件法测定岩石强度参数的修正方法[J].土木工程学报,2011,44(增刊):162-165.(LIUBao-guo,CUI Shao-dong.Improvement of single specimen method for determination of rock strength parameters[J].China Civil Engineering Journal,2011,44(S0):162-165.(in Chinese))
[18]宋晓明.单试件法确定岩石强度参数的特点及改进方法[J].科学技术创新,2016(11):33-34.(SONG Xiao-ming.The characteristics and improvement methods of strength parameters of rock are determined by single test method[J].Heilongjiang Science and Technology Innovation,2016:33-34.(in Chinese))