东梁煤矿非饱和砂岩黏弹塑性蠕变分析
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摘要
为探讨非饱和砂岩的蠕变特征,利用TAW-2000电液伺服岩石三轴仪对阜新东梁煤矿砂岩进行了不同应力水平的三轴蠕变试验,用改进的流变模型来描述非饱和砂岩蠕变的全过程,并对改进黏弹塑性流变模型的参数进行了确定.研究结果表明:在低中等应力水平作用下,非饱和砂岩因受其成分、结构和水分等因素影响,蠕变变形不稳定,蠕变曲线呈现出不同程度的凹凸变化;在高应力水平作用下蠕变过程相对平稳且出现加速蠕变阶段.考虑非饱和砂岩蠕变具有弹性变形、塑性变形和粘性变形的性质,引入非线性黏壶元件改进了黏弹塑性蠕变模型,模型计算结果与试验结果的吻合度较好.
In order to understand the creep characteristics of unsaturated sandstone,a series of triaxial creep tests under different stress level for unsaturated sandstone in Dongliang mine are carried out by TAW-2000 electro-hydraulic servo rock triaxial machine. The whole creep process of unsaturated sandstone is described with modified viscoelastic-plastic rheological model, and model parameters are determined. At lower and medium stress level, structure and moisture and other factors, creep deformation is unstable and unevenness changes of creep curves appeared due to its non-saturated sandstone composition. At high stress level, creep curves is relatively smooth and acceleration creep stage appears. Considering elastic deformation, plastic deformation and viscous deformation of unsaturated sandstone in process of creep, viscoelastic-plastic creep model is modified by introducing nonlinear viscous component. The calculated results fit well with the test results.
In order to understand the creep characteristics of unsaturated sandstone,a series of triaxial creep tests under different stress level for unsaturated sandstone in Dongliang mine are carried out by TAW-2000 electro-hydraulic servo rock triaxial machine. The whole creep process of unsaturated sandstone is described with modified viscoelastic-plastic rheological model, and model parameters are determined. At lower and medium stress level, structure and moisture and other factors, creep deformation is unstable and unevenness changes of creep curves appeared due to its non-saturated sandstone composition. At high stress level, creep curves is relatively smooth and acceleration creep stage appears. Considering elastic deformation, plastic deformation and viscous deformation of unsaturated sandstone in process of creep, viscoelastic-plastic creep model is modified by introducing nonlinear viscous component. The calculated results fit well with the test results.
引文
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[15]周长冰,万志军,张源,等.高温三轴应力下气煤蠕变特征及本构模型[J].煤炭学报,2012,37(12):2 020-2 025.ZHOU Changbing,WAN Zhijun,ZHANG Yuan,et al.Creep characteristics and constitutive model of gas coal mass under high temperature and triaxial stress[J].Journal of China Coal Society,2012,37(12):2 020-2 025.
[2]赵宝云,刘东燕,郑颖人,等.红砂岩单轴压缩蠕变试验及模型研究[J].采矿与安全工程学报,2013,30(5):44-747.ZHAO Baoyun,LIU Dongyan,DENG Yingren,et al.Uniaxial compressive creep test of red sandstone and its constitutive model[J].Journal of Mining&Safety Engineering,2013,30(5):744-747.
[3]李男,徐辉,胡斌.干燥与饱水状态下砂岩的剪切蠕变特性研究[J].岩土力学,2012,33(2):439-443.LI Nan,XU Hui,HU Bin.Shear creep characteristics of sandstone under dry and saturated states[J].Rock and Soil Mechanics,2012,33(2):439-443.
[4]刘东燕,赵宝云,朱可善,等.砂岩直接拉伸蠕变特性及Burgers模型的改进与应用[J].岩土工程学报,2011,33(11):1 740-1 744.LIU Dongyan,ZHAO Baoyun,ZHU Keshan,et al.Direct tension creep behaviors of sandstone and improvement and application of Burgers model[J].Chinese Journal of Geotechnical Engineering,2011,33(11):1740-1744.
[5]黄明,张旭东.含水状态下T2b2泥质粉砂岩蠕变特性试验研究[J].工业建筑,2011,41(4):77-81.HUANG Ming,ZHANG Xudong.Test study on the creep properties of T2b2 siltite in different moisture states[J].Industrial Construction,2011,41(1):77-81.
[6]龚选平.泥质粉砂岩含水率对其蠕变特性影响的研究[D].西安:西安科技大学,2006.
[7]王永岩,吕宜美,肖志娟,等.化学腐蚀下砂岩蠕变模型的研究[J].煤炭学报,2010,35(7):1 095-1 098.WANG Yongyan,LU Yimei,XIAO Zhijuan,et al.Research on sandstone creep models under chemical corrosion[J].Journal of China Coal Society,2010,35(7):1 095-1 098.
[8]易富,李军,孙迪.化学效应下的砂岩蠕变机理[J].辽宁工程技术大学学报(自然科学版),2015,34(3):369-372.doi:10.11956/j.issn.1008-0562.2015.03.017YI Fu,LI Jun,SUN Di.Creep mechanics of sandstone with chemical effect[J].Journal of Liaoning Technical University(Natural Science),2015,34(3):369-372.doi:10.11956/j.issn.1008-0562.2015.03.017
[9]郭臣业,鲜学福,姜永东,等.破裂砂岩蠕变试验研究[J].岩石力学与工程学报,2010,29(5):990-995.GUO Chenye,XIAN Xuefu,JIANG Yongdong,et al.Experimental research on creep of fractured sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(5):990-995.
[10]佘成学.岩石非线性黏弹塑性蠕变模型研究[J].岩石力学与工程学报,2009,28(10):2 006-2 011.SHE Chengxue.Research on nonlinear visco-elasto-plastic creep model of rock[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(10):2 006-2 011.
[11]张树光,马涛,王有涛.辽西花岗岩三轴蠕变时效性试验[J].辽宁工程技术大学学报(自然科学版),2014,33(10):1 342-1 347.doi:10.3969/j.issn.1008-0562.2014.010.010ZHANG Shuguang,MA Tao,WANG Youtao.Experimental study o n time-dependent properties of triaxial creep of granite in West Region of Liaoning[J].Journal of Liaoning Technical University(N atural Science),2014,33(10):1 342-1 347.doi:10.3969/j.issn.1008-0562.2014.010.010
[12]梁小勇,薛晓辉,王虎妹,等.岩石时间硬化损伤蠕变特性[J].辽宁工程技术大学学报(自然科学版),2013,32(4):509-513.LIANG Xiaoyong,XUE Xiaohui,WANG Humei,et al.Damage creep characteristics of rock time-hardening[J].Journal of Liaoning Technical University(Natural Science),2013,32(4):509-513.
[13]夏才初,王晓东,许崇帮,等.用统一流变力学模型理论辨识流变模型的方法和实例[J].岩石力学与工程学报,2008,27(8):1 594-1 600.XIA Caichu,WNAG Xiaodong,XU Chongbang,et al.Method to identify rheological models by unified rheological model theory and case study[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(8):1 594-1 600.
[14]LIU Lang,WANG Geming,CHEN Jianhong.et al.Creep experiment and rheological model of deep saturated rock[J].Transactions of Nonferrous Metals Society of China,2013,23:478-483.
[15]周长冰,万志军,张源,等.高温三轴应力下气煤蠕变特征及本构模型[J].煤炭学报,2012,37(12):2 020-2 025.ZHOU Changbing,WAN Zhijun,ZHANG Yuan,et al.Creep characteristics and constitutive model of gas coal mass under high temperature and triaxial stress[J].Journal of China Coal Society,2012,37(12):2 020-2 025.