胶结充填体热-力-损伤行为模拟及试验分析
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摘要
通过数值模拟和试验分析相结合的方法对胶结充填体的热-力-损伤行为进行研究。在对比胶结充填体应力-应变曲线、损伤变量和温度演化的模型计算值和试验值,证明模型的有效性和适用性基础上,研究了不同水胶比和充填速率对其变形与损伤的影响。结果表明:提高胶结充填体的养护温度、水胶比和充填速率可以改善其力学性能,如峰值强度(弹性模量)的增加和损伤程度的降低。
The thermal-mechanical-damage behavior of cemented backfill was researched by the numerical simulation and experimental analysis.The validity and availability of the developed model were verified by comparing stress-strain curves,damage variable and temperature evolution of cemented backfill between the model calculation and experiment observation.Based on that,the effects of water-to-binder ratio and backfilling rate on deformation and damage of cemented backfill were studied.The results demonstrated that increasing the curing temperature,water-to-binder ratio and backfilling rate could all improve the mechanical properties of cemented backfill,for instance,the increase of peak strength(elastic modulus)and decrease of damage degree of cemented backfill.
The thermal-mechanical-damage behavior of cemented backfill was researched by the numerical simulation and experimental analysis.The validity and availability of the developed model were verified by comparing stress-strain curves,damage variable and temperature evolution of cemented backfill between the model calculation and experiment observation.Based on that,the effects of water-to-binder ratio and backfilling rate on deformation and damage of cemented backfill were studied.The results demonstrated that increasing the curing temperature,water-to-binder ratio and backfilling rate could all improve the mechanical properties of cemented backfill,for instance,the increase of peak strength(elastic modulus)and decrease of damage degree of cemented backfill.
引文
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[4]Cervera M,Oliver J,Prato T.Thermo-chemo-mechanical model for concrete.II:Damage and creep[J].Journal of Engineering Mechanics,1999,125(9):1028-1039.
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[6]王勇,吴爱祥,王洪江,等.初始温度条件下全尾胶结膏体损伤本构模型[J].北京科技大学学报,2017,39(1):31-38.
[7]Wang Y,Fall M,Wu A.Initial temperature-dependence of strength development and self-desiccation in cemented paste backfill that contains sodium silicate[J].Cement&Concrete Composites,2016,67:101-110.
[8]Wu D,Zhang Y,Wang C.Modeling the thermal response of hydrating cemented gangue backfill with admixture of fly ash[J].Thermochimica Acta,2015,623:86-94.
[9]Chen G M,He Y H,Yang H,et al.Compressive behavior of steel fiber reinforced recycled aggregate concrete after exposure to elevated temperatures[J].Construction&Building Materials,2014,71(71):1-15.
[10]Nasir O,Fall M.Coupling binder hydration,temperature and compressive strength development of underground cemented paste backfill at early ages[J].Tunnelling&Underground Space Technology,2010,25(1):9-20.
[11]何满潮,郭平业,陈学谦,等.三河尖矿深井高温体特征及其热害控制方法[J].岩石力学与工程学报,2010,29(S1):2593-2597.
[12]邓代强,姚中亮,唐绍辉,等.单轴压缩作用下充填体损伤本构模型研究[J].土工基础,2006,20(3):53-55.
[13]Khan M I.Factors affecting the thermal properties of concrete and applicability of its prediction models[J].Building&Environment,2002,37(6):607-614.
[2]杨震.粉煤灰矸石胶结充填体的固化特性与底板稳定性分析[D].青岛:青岛理工大学,2011.
[3]Wu D,Zhang Y,Liu Y.Mechanical performance and ultrasonic properties of cemented gangue backfill with admixture of fly ash[J].Ultrasonics,2016,64:89-96.
[4]Cervera M,Oliver J,Prato T.Thermo-chemo-mechanical model for concrete.II:Damage and creep[J].Journal of Engineering Mechanics,1999,125(9):1028-1039.
[5]Kim J K,Moon Y H,Eo S H.Compressive strength development of concrete with different curing time and temperature[J].Cement&Concrete Research,1998,28(12):1761-1773.
[6]王勇,吴爱祥,王洪江,等.初始温度条件下全尾胶结膏体损伤本构模型[J].北京科技大学学报,2017,39(1):31-38.
[7]Wang Y,Fall M,Wu A.Initial temperature-dependence of strength development and self-desiccation in cemented paste backfill that contains sodium silicate[J].Cement&Concrete Composites,2016,67:101-110.
[8]Wu D,Zhang Y,Wang C.Modeling the thermal response of hydrating cemented gangue backfill with admixture of fly ash[J].Thermochimica Acta,2015,623:86-94.
[9]Chen G M,He Y H,Yang H,et al.Compressive behavior of steel fiber reinforced recycled aggregate concrete after exposure to elevated temperatures[J].Construction&Building Materials,2014,71(71):1-15.
[10]Nasir O,Fall M.Coupling binder hydration,temperature and compressive strength development of underground cemented paste backfill at early ages[J].Tunnelling&Underground Space Technology,2010,25(1):9-20.
[11]何满潮,郭平业,陈学谦,等.三河尖矿深井高温体特征及其热害控制方法[J].岩石力学与工程学报,2010,29(S1):2593-2597.
[12]邓代强,姚中亮,唐绍辉,等.单轴压缩作用下充填体损伤本构模型研究[J].土工基础,2006,20(3):53-55.
[13]Khan M I.Factors affecting the thermal properties of concrete and applicability of its prediction models[J].Building&Environment,2002,37(6):607-614.