红层砂岩高温后效蠕变试验研究
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摘要
温度是影响岩石变形、稳定的重要因素。通过对红层砂岩开展高温后的蠕变试验,揭示了温度对红层砂岩蠕变特性的影响规律,并基于Burgers模型建立考虑温度效应的蠕变损伤模型,分析了温度对模型参数的影响规律。研究表明:510～550℃是红层砂岩力学性质转变的节点温度区间,低于该温度区间时,温度升高,试样的峰值强度增加,延性增强,长期强度减小;高于该温度区间时,温度升高,试样的峰值强度、峰值应变减小,长期强度增加;瞬时应变随温度的升高而线性增大。相同应力条件下,随着经历温度的升高,试样瞬时应变、稳态蠕变速率以及进入稳定蠕变阶段的时间增加,进入加速蠕变阶段的时间减小,加速蠕变曲线变陡。
Temperature is an important factor affecting rock deformation and stability.The influence of temperature on the creep characteristics of red-bed sandstone is revealed through the creep test of red-bed sandstone after different high temperatures,and a creep damage model considering the temperature effect based on the Burgers model is established to analyze the influence rule of temperature on model parameters.The research results indicate that 510～550°C is the nodal temperature range for the change in mechanical properties of red-bed sandstone.Below this temperature range,with the temperature increases,the peak strength of specimen increase,ductility increases,and the long-term strength decreases.Above this temperature range,with the temperature increases,the peak strength and peak strain of specimen decrease,and the long-term strength increases.The instantaneous strain increases linearly with the increasing temperature.Under the same stress conditions,with the temperature increases,the instantaneous strain of specimen,the steady-state creep rate and the time to enter the stable creep stage increase,the time to enter the accelerated creep stage decreases,and the acceleration creep curve becomes steeper.
Temperature is an important factor affecting rock deformation and stability.The influence of temperature on the creep characteristics of red-bed sandstone is revealed through the creep test of red-bed sandstone after different high temperatures,and a creep damage model considering the temperature effect based on the Burgers model is established to analyze the influence rule of temperature on model parameters.The research results indicate that 510～550°C is the nodal temperature range for the change in mechanical properties of red-bed sandstone.Below this temperature range,with the temperature increases,the peak strength of specimen increase,ductility increases,and the long-term strength decreases.Above this temperature range,with the temperature increases,the peak strength and peak strain of specimen decrease,and the long-term strength increases.The instantaneous strain increases linearly with the increasing temperature.Under the same stress conditions,with the temperature increases,the instantaneous strain of specimen,the steady-state creep rate and the time to enter the stable creep stage increase,the time to enter the accelerated creep stage decreases,and the acceleration creep curve becomes steeper.
引文
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[2]WAI R S C,LO K Y,ROWE R K.Thermal stress analysis in rocks with nonlinear properties[J].International Journal of Rock Mechanics&Mining Sciences&Geomechanics Abstracts,1982,19(5):211-220.
[3]赵阳升,万志军,康建荣.高温岩体地热开发导论[M].北京:科学出版社,2004.[ZHAO Y S,WANZ J,KANG J R.Introduction of geothermal development of high temperature rock mass[M].Beijing:Science Press,2004.(in Chinese)]
[4]CHOPRA P N.High-temperature transient creep in olivine rocks[J].Tectonophysics,1997,279(1-4):93-111.
[5]KINOSHITA N,INADA Y.Effects of high temperature on strength,deformation,thermal properties and creep of rocks[J].Journal of the Society of Materials Science Japan,2006,55(5):489-494.
[6]SHIBATA K,TANI K,OKADA T.Creep behavior of tuffaceous rock at high temperature observed in unconfined compression test[J].Soils and Foundations-Tokyo-,2011,47(1):1-10.
[7]曾晋.温度-渗流-应力耦合作用下岩石损伤及声发射特征研究[J].水文地质工程地质,2018,45(1):69-74.[ZENG J.A study of the rick damage and AE characteristics under the coupling of temperature,seep and stress[J].Hydrogeology&Engineering Geology,2018,45(1):69-74.(in Chinese)]
[8]周广磊,徐涛,朱万成,等.基于温度-应力耦合作用的岩石时效蠕变模型[J].工程力学,2017,34(10):1-9.[ZHOU G L,XU T,ZHU W C,et al.A time-dependent thermo-mechanical creep model of rock[J].Engineering Mechanics,2017,34(10):1-9.(in Chinese)]
[9]王春萍,陈亮,梁家玮,等.考虑温度影响的花岗岩蠕变全过程本构模型研究[J].岩土力学,2014,35(9):2493-2500.[WANG C P,CHEN L,LIANG JW,et al.Creep constitutive model for full creep process of granite considering thermal effect[J].Rock and Soil Mechanics,2014,35(9):2493-2500.(in Chinese)]
[10]张强勇,向文,江力宇,等.片麻状花岗岩热黏弹塑性损伤蠕变模型及应用研究[J].土木工程学报,2017,50(8):88-97.[ZHANG Q Y,XIANG W,JIANG L Y,et al.A thermal-visco-elastoplastic damage creep model for gneissic granite and its practical application[J].China Civil Engineering Journal,2017,50(8):88-97.(in Chinese)]
[11]曹丽丽,浦海,仇陪涛,等.基于函数阶微积分的泥岩高温蠕变特性分析[J].采矿与安全工程学报,2017,34(1):148-154.[CAO L L,PU H,QIU PT,et al.Analyzing creeping properties of mudstone at high temperature based on variable-order fractional calculus[J].Journal of Mining and Safety Engineering,2017,34(1):148-154.(in Chinese)]
[12]曹文贵,杨尚,张超.考虑弹性模量变化的岩石统计损伤本构模型[J].水文地质工程地质,2017,44(3):42-48.[CAO W G,YANG S,ZHANG C.Astatistical damage constitutive model of rocks considering the variation of the elastic modulus[J].Hydrogeology&Engineering Geology,2017,44(3):42-48.(in Chinese)]
[13]杨文东,张强勇,陈芳,等.辉绿岩非线性流变模型及蠕变加载历史的处理方法研究[J].岩石力学与工程学报,2011,30(7):1405-1413.[YANG W D,ZHANG Q Y,CHEN F,et al.Research on nonlinear rheological model of diabase and treatment for creep loading history[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(7):1405-1413.(in Chinese)]
[14]李良权,徐卫亚,王伟,等.基于流变试验的向家坝砂岩长期强度评价[J].工程力学,2010,27(11):127-136.[LI L Q,XU W Y,WANG W,et al.Estimation of long-term strength for Xiangjiaba sandstone based on creep tests[J].Engineering Mechanics,2010,27(11):127-136.(in Chinese)]
[15]范庆忠,高延法.分级加载条件下岩石流变特性的试验研究[J].岩土工程学报,2005,27(11):1273-1276.[FAN Q Z,GAO Y F.Experimental study on creep properties of rocks under stepwise loading[J].Chinese Journal of Geotechnical Engineer,2005,27(11):1273-1276.(in Chinese)]
[16]吴刚,邢爱国,张磊.砂岩高温后的力学特性[J].岩石力学与工程学报,2007,26(10):2110-2116.[WU G,XING A G,ZHANG L.Mechanical characteristics of sandstone after high temperatures[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(10):2110-2116.(in Chinese)]
[17]宋勇军,雷胜友,刘向科.基于硬化和损伤效应的岩石非线性蠕变模型[J].煤炭学报,2012,37(增刊2):287-292.[SONG Y J,LEI S Y,LIU X K.Nonlinear rock creep model based on hardening and damage effect[J].Journal of China Coal Society,2012,37(Sup 2):287-292.(in Chinese)]
[18]许宏发.软岩强度和弹模的时间效应研究[J].岩石力学与工程学报,1997,16(3):246-251.[XU HF.Time dependent behaviours of strength and elasticity modulus of weak rock[J].Chinese Journal of Rock Mechanics and Engineering,1997,16(3):246-251.(in Chinese)]
[19]王志俭,殷坤龙,简文星,等.三峡库区万州红层砂岩流变特性试验研究[J].岩石力学与工程学报,2008,27(4):840-847.[WANG Z J,YIN K L,JIAN W X,et al.Experimental study on rheological behaviors of Wanzhou red sandstone in Three Gorges Reservoir area[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(4):840-847.(in Chinese)]
[20]谌文武,原鹏博,刘小伟.分级加载条件下红层软岩蠕变特性试验研究[J].岩石力学与工程学报,2009,28(增刊1):3076-3081.[CHEN W W,YUAN P B,LIU X W.Study on creep properties of red-bed soft rock under step load[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(Sup1):3076-3081.(in Chinese)]