裂隙辉绿岩蠕变试验及模型研究
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摘要
为研究裂隙岩体的蠕变特性,对红透山铜矿深部岩体(裂隙辉绿岩)制备的标准试样进行单轴压缩蠕变试验。试验结果表明,裂隙角度对辉绿岩的强度特征影响显著,单级加载过程中应力-应变关系接近线性,整个加载过程中弹性模量为变化值,裂隙角度为3°、28.9°、63.5°、82.4°的辉绿岩长期强度约为对应单轴抗压强度的68%～75%、59%～88%、61%～76%、56%～64%。将引入的裂隙塑性元件及非线性牛顿体与Burgers模型串联,采用该裂隙岩石复合元件蠕变模型对辉绿岩蠕变曲线进行辨识,根据试样蠕变试验数据及拟合结果对裂隙岩石复合元件蠕变模型进行改进,得到裂隙岩石复合元件蠕变模型,根据试验数据对改进蠕变模型进行拟合,拟合结果与试验曲线比较吻合。上述研究结果对不同裂隙角度辉绿岩蠕变特性具有一定的参考价值。
In order to study the creep characteristics of fissured rock mass,uniaxial compression creep experiment was carried out for prepared standard specimens taken from the deep rock mass(fissured diabase)in Hongtangshan Copper Mine.Experimental results show that the effect of fracture angle on strength characteristics of diabase is significant.The stress-strain relationship is close to the linear during the single-stage loading process.The elastic modulus value changes during the whole loading process.The long-term strength of diabase with fracture angle of 3°,28.9°,63.5°and 82.4°is only about 68% ～75%,59% ～88%,61% ～76% and 56% ～64% of the corresponding uniaxial compressive strength,respectively.Connecting the introduced fracture plastic element and nonlinear Newtonian body with the burgers model in series,identifying the creep curve of diabase by the creep model of fissured rock composite element,the creep model of fissured rock composite element was improved based on specimens′creep experimental data and fitting results,finally,the improved creep model of fissured rock composite element was obtained.According to experimental data,the improved creep model is fitted,and the fitting results are in good agreement with the experimental curve.Above results have certain reference value for creep characteristics of diabase with different fracture angles.
In order to study the creep characteristics of fissured rock mass,uniaxial compression creep experiment was carried out for prepared standard specimens taken from the deep rock mass(fissured diabase)in Hongtangshan Copper Mine.Experimental results show that the effect of fracture angle on strength characteristics of diabase is significant.The stress-strain relationship is close to the linear during the single-stage loading process.The elastic modulus value changes during the whole loading process.The long-term strength of diabase with fracture angle of 3°,28.9°,63.5°and 82.4°is only about 68% ～75%,59% ～88%,61% ～76% and 56% ～64% of the corresponding uniaxial compressive strength,respectively.Connecting the introduced fracture plastic element and nonlinear Newtonian body with the burgers model in series,identifying the creep curve of diabase by the creep model of fissured rock composite element,the creep model of fissured rock composite element was improved based on specimens′creep experimental data and fitting results,finally,the improved creep model of fissured rock composite element was obtained.According to experimental data,the improved creep model is fitted,and the fitting results are in good agreement with the experimental curve.Above results have certain reference value for creep characteristics of diabase with different fracture angles.
引文
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[12]夏才初,闫子舰,王晓东,等.大理岩卸荷条件下弹黏塑性本构关系研究[J].岩石力学与工程学报,2009,28(3):459-466(XIA Caichu,YAN Zijian,WANG Xiaodong,et al.Research on elasto-viscopastic constitutive relation of marble under unloading condition[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(3):459-466(in Chinese))
[13]沈明荣,谌洪菊.红砂岩长期强度特性的试验研究[J].岩土力学,2011,32(11):3301-3305(SHEN Mingrong,CHEN Hongju.Testing study of long-term strength characteristics of red sandstone[J].Rock and Soil Mechanics,2011,32(11):3301-3305(in Chinese))
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[15]赵延林,曹平,陈沅江,等.分级加载下节理软岩流变试验及模型[J].煤炭学报,2008,35(7):748-753(ZHAO Yanlin,CAO Ping,CHEN Yuanjiang,et al.Creep properties experiment and model of jointed soft rocks under step load and unload[J].Journal of China Coal Society,2008,35(7):748-753(in Chinese))
[16]陈沅江,潘长良,曹平,等.软岩流变的一种新力学模型[J].岩土力学,2003,24(2):209-214(CHENYuanjiang,PAN Changliang,CAO Ping,et al.A new mechanical model for soft rock rheology[J].Rock and Soil Mechanics,2003,24(2):209-214(in Chinese))
[17]程先云.优化·拟合·建模:1stOpt应用详解[M].北京:中国建材工业出版社,2012(CHENG Xianyun.Optimization·fitting·modeling:1stOpt application explanation[M].Beijing:China Building Materials Industry Press,2012(in Chinese))
[18]王永岩,魏佳,齐珺,等.深部岩体非线性蠕变变形预测的研究[J].煤炭学报,2005,30(4):409-413(WANGYongyan,WEI Jia,QI Jun,et al.Study on prediction for nonlinear creep deformation of deep rocks[J].Journal of China Coal Society,2005,30(4):409-413(in Chinese))
[19]高赛红,曹平,汪胜莲,等.改进的岩石非线性黏弹塑性蠕变模型及其硬化黏滞系数的修正[J].煤炭学报,2012,37(6):936-943(GAO Saihong,CAO Ping,WANG Shenglian,et al.Improved nonlinear viscoelastoplastic rheological model of rock and its correction of hardening coefficient of viscosity[J].Journal of China Coal Society,2012,37(6):936-943(in Chinese))
[2]Maranini E,Brignoli M.Creep behaviour of a weak rock:experimental characterization[J].International Journal of Rock Mechanics&Mining Sciences,1999,36(1):127-138.
[3]Yang Z F,Chen J M,Huang T H.Effect of joint sets on the strength and deformation of rock mass models[J].International Journal of Rock Mechanics and Mining Sciences,1998,35(1):75-84.
[4]冒海军,阳春和.结构面对板岩力学特性的影响研究[J].岩石力学与工程学报,2005,24(20):3651-3656(MAO Haijun,YANG Chunhe.Study on effects of discontinuities on mechanical characters of slate[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(20):3651-3656(in Chinese))
[5]Nasseri M H,Rao K S,Ramamurthy T.Failure mechanism in schistose rocks[J].International Journal of Rock Mechanics and Mining Sciences,1997,34(3/4):219.
[6]Griggs D T.Creep of rocks[J].Journal of Geology,1939,47(3):225-251.
[7]Li X,Konietzky H.Numerical simulation schemes for time-dependent crack growth in hard brittle rock[J].Acta Geotechnica,2015,10(4):513-531.
[8]夏才初.软岩的流变性及其尺寸效应的研究[D].长沙:中南工业大学,1987(XIA Caichu.Study on the rheology of soft rock and its size effect[D].Changsha:Central South University of Technology,1987(in Chinese))
[9]李良权,徐卫亚,王伟.基于西原模型的非线性黏弹塑性流变模型[J].力学学报,2009,41(5):671-680(LILiangquan,XU Weiya,WANG Wei.A nonlinear viscoelasto plastic rheological model based on Nishihara′s model[J].Chinese Journal of Theoretical and Applied Mechanics,2009,41(5):671-680(in Chinese))
[10]杨超,黄达,黄润秋,等.断续双裂隙砂岩三轴卸荷蠕变特性试验及损伤蠕变模型[J].煤炭学报,2016,41(9):2203-2211(YANG Chao,HUANG Da,HUANG Runqiu,et al.Experimental study on the triaxial unloading creep characteristics of stone with two pre-existing cracks and its damage creep model[J].Journal of China Coal Society,2016,41(9):2203-2211(in Chinese))
[11]韩庚友,王思敬,张晓平,等.分级加载下薄层状岩石蠕变特性研究[J].岩石力学与工程学,2010,29(11):2239-2247(HAN Gengyou,WANG Sijing,ZHANG Xiaoping,et al.Study of creep properties of thinly laminated rock under step loading[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(11):2239-2247(in Chinese))
[12]夏才初,闫子舰,王晓东,等.大理岩卸荷条件下弹黏塑性本构关系研究[J].岩石力学与工程学报,2009,28(3):459-466(XIA Caichu,YAN Zijian,WANG Xiaodong,et al.Research on elasto-viscopastic constitutive relation of marble under unloading condition[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(3):459-466(in Chinese))
[13]沈明荣,谌洪菊.红砂岩长期强度特性的试验研究[J].岩土力学,2011,32(11):3301-3305(SHEN Mingrong,CHEN Hongju.Testing study of long-term strength characteristics of red sandstone[J].Rock and Soil Mechanics,2011,32(11):3301-3305(in Chinese))
[14]蒲成志.岩体断裂与蠕变损伤破坏机理研究[D].长沙:中南大学,2014(PU Zhicheng.Research on the mechanism of rock fracture and creep damage failure[D].Changsha:Central South University,2014(in Chinese))
[15]赵延林,曹平,陈沅江,等.分级加载下节理软岩流变试验及模型[J].煤炭学报,2008,35(7):748-753(ZHAO Yanlin,CAO Ping,CHEN Yuanjiang,et al.Creep properties experiment and model of jointed soft rocks under step load and unload[J].Journal of China Coal Society,2008,35(7):748-753(in Chinese))
[16]陈沅江,潘长良,曹平,等.软岩流变的一种新力学模型[J].岩土力学,2003,24(2):209-214(CHENYuanjiang,PAN Changliang,CAO Ping,et al.A new mechanical model for soft rock rheology[J].Rock and Soil Mechanics,2003,24(2):209-214(in Chinese))
[17]程先云.优化·拟合·建模:1stOpt应用详解[M].北京:中国建材工业出版社,2012(CHENG Xianyun.Optimization·fitting·modeling:1stOpt application explanation[M].Beijing:China Building Materials Industry Press,2012(in Chinese))
[18]王永岩,魏佳,齐珺,等.深部岩体非线性蠕变变形预测的研究[J].煤炭学报,2005,30(4):409-413(WANGYongyan,WEI Jia,QI Jun,et al.Study on prediction for nonlinear creep deformation of deep rocks[J].Journal of China Coal Society,2005,30(4):409-413(in Chinese))
[19]高赛红,曹平,汪胜莲,等.改进的岩石非线性黏弹塑性蠕变模型及其硬化黏滞系数的修正[J].煤炭学报,2012,37(6):936-943(GAO Saihong,CAO Ping,WANG Shenglian,et al.Improved nonlinear viscoelastoplastic rheological model of rock and its correction of hardening coefficient of viscosity[J].Journal of China Coal Society,2012,37(6):936-943(in Chinese))