基于不同应变测量方式的冻融岩石单轴压缩力学性能研究
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摘要
采用不同的应变测量方式对冻融循环后砂岩开展了系列压缩试验,系统地分析了不同应变测量方式下岩石的应力-应变曲线、抗压强度、弹性模量随冻融循环次数的变化规律,并研究了不同应变测量方式对冻融后砂岩力学性能试验结果的影响。研究结果表明:两种应变测量方式下,砂岩的抗压强度以及弹性模量随冻融循环次数的增加而降低,并且呈现相似的劣化趋势。同时,表架约束法测得的抗压强度及弹性模量明显高于无约束千分表法。
In this paper,a series of compression experiments for sandstone subjected to freezingthawing cycles were carried out by using different strain measurement methods.The variation pattern of rock′s stress-strain curves,compressive strength and modulus of elasticity along with the times of freeze-thaw cycles were systematically analyzed by using different strain measurement methods.The effect of different strain measurement methods on the experimental results of mechanical properties of frozen and thawed sandstone was also studied.Results show that the compressive strength and elastic modulus of sandstone decrease with the increase of freezing-thawing cycles by using two kinds strain measurement methods,and show a similar trend of deterioration. Meanwhile,the measured compressive strength and elastic modulus based on the confined frame method are larger than those measured based on the unconstrained dial gauge method.
In this paper,a series of compression experiments for sandstone subjected to freezingthawing cycles were carried out by using different strain measurement methods.The variation pattern of rock′s stress-strain curves,compressive strength and modulus of elasticity along with the times of freeze-thaw cycles were systematically analyzed by using different strain measurement methods.The effect of different strain measurement methods on the experimental results of mechanical properties of frozen and thawed sandstone was also studied.Results show that the compressive strength and elastic modulus of sandstone decrease with the increase of freezing-thawing cycles by using two kinds strain measurement methods,and show a similar trend of deterioration. Meanwhile,the measured compressive strength and elastic modulus based on the confined frame method are larger than those measured based on the unconstrained dial gauge method.
引文
[1]杨更社,蒲毅彬,马巍.寒区冻融环境条件下岩石损伤扩展研究探讨[J].实验力学,2002,17(2):220-226(YANG Gengshe,PU Yibing,MA Wei.Discussion on the damage propagation for the rock under the frost and thaw condition of frigid zone[J].Journal of Experimental Mechanics,2002,17(2):220-226(in Chinese))
[2]杨更社.冻结岩石力学的研究现状与展望分析[J].力学与实践,2009,31(6):9-16(YANG Gengshe.A review onfrozen rock mechanics[J].Mechanics in Engineering,2009,31(6):9-16(in Chinese))
[3]郭中华,朱珍德,杨志祥,等.岩石强度特性的单轴压缩试验研究[J].河海大学学报,2002,30(2):93-96(GUO Zhonghua,ZHU Zhende,YANG Zhixiang,et al.Study on rock strength characteristics based on uniaxial compression tests[J].Journal of Hohai University,2002,30(2):93-96(in Chinese))
[4]徐光苗,刘泉声.岩石冻融破坏机理分析及冻融力学试验研究[J].岩石力学与工程学报,2005,24(17):3076-3082(XU Guangmiao,LIU Quansheng.Analysis of mechanism of rock failure due to freeze-thaw cycling and mechanical testing study on frozen-thawed rocks[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(17):3076-3082(in Chinese))
[5]张慧梅,杨更社.冻融与荷载耦合作用下岩石损伤模型的研究[J].岩石力学与工程学报,2010,29(3):471-476(ZHANG Huimei,YANG Gengshe.Research on damage model of rock under coupling action of freeze-thaw and load[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(3):471-476(in Chinese))
[6] Ghobadi M H,Babazadeh R.Experimental studies on the effects of cyclic freezing-thawing,salt crystallization,and thermal shock on the physical and mechanical characteristics of selected sandstones[J].Rock Mechanics&Rock Engineering,2015,48(3):1001-1016.
[7] Khanlari G,Sahamieh R Z,Abdilor Y.The effect of freeze-thaw cycles on physical and mechanical properties of upper red formation sandstones,central part of Iran[J].Arabian Journal of Geosciences,2015,8(8):5991-6001.
[8] GBT 50266-2013,工程岩体试验方法标准[S].北京:中国计划出版社,2013(GBT 50266-2013,Standard for test methods of engineering rock mass[S].Beijing:China Planning Press,2013(in Chinese))
[9]贺有富.改进表架的千分表法测定岩石弹性模量[J].人民珠江,1998,6:9-11(HE Youfu.Determination of elastic modulus of rock by improved micrometer[J].Pearl River,1998,6:9-11(in Chinese))
[10]宾峰.冻融循环作用下岩石动态力学特性及微观机理研究[D].中南大学,2014(BIN Feng.Study on dynamic mechanical properties and micro-structure mechanism of rock under freeze-thaw cycles[D].Central South University,2014(in Chinese))
[11] Li Diyuan,Wong L N Y,Liu Gang,et al.Influence of water content and anisotropy on the strength and deformability of low porosity meta-sedimentary rocks under triaxial compression[J].Engineering Geology,2012,126(1):46-66.
[12]张慧梅,杨更社.冻融岩石损伤劣化及力学特性试验研究[J].煤炭学报,2013,38(10):1759-1762(ZHANG Huimei,YANG Gengshe.Experimental study of damage deterioration and mechanical properties for freezingthawing rock[J].Journal of China Coal Society,2013,38(10):1759-1762(in Chinese))
[2]杨更社.冻结岩石力学的研究现状与展望分析[J].力学与实践,2009,31(6):9-16(YANG Gengshe.A review onfrozen rock mechanics[J].Mechanics in Engineering,2009,31(6):9-16(in Chinese))
[3]郭中华,朱珍德,杨志祥,等.岩石强度特性的单轴压缩试验研究[J].河海大学学报,2002,30(2):93-96(GUO Zhonghua,ZHU Zhende,YANG Zhixiang,et al.Study on rock strength characteristics based on uniaxial compression tests[J].Journal of Hohai University,2002,30(2):93-96(in Chinese))
[4]徐光苗,刘泉声.岩石冻融破坏机理分析及冻融力学试验研究[J].岩石力学与工程学报,2005,24(17):3076-3082(XU Guangmiao,LIU Quansheng.Analysis of mechanism of rock failure due to freeze-thaw cycling and mechanical testing study on frozen-thawed rocks[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(17):3076-3082(in Chinese))
[5]张慧梅,杨更社.冻融与荷载耦合作用下岩石损伤模型的研究[J].岩石力学与工程学报,2010,29(3):471-476(ZHANG Huimei,YANG Gengshe.Research on damage model of rock under coupling action of freeze-thaw and load[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(3):471-476(in Chinese))
[6] Ghobadi M H,Babazadeh R.Experimental studies on the effects of cyclic freezing-thawing,salt crystallization,and thermal shock on the physical and mechanical characteristics of selected sandstones[J].Rock Mechanics&Rock Engineering,2015,48(3):1001-1016.
[7] Khanlari G,Sahamieh R Z,Abdilor Y.The effect of freeze-thaw cycles on physical and mechanical properties of upper red formation sandstones,central part of Iran[J].Arabian Journal of Geosciences,2015,8(8):5991-6001.
[8] GBT 50266-2013,工程岩体试验方法标准[S].北京:中国计划出版社,2013(GBT 50266-2013,Standard for test methods of engineering rock mass[S].Beijing:China Planning Press,2013(in Chinese))
[9]贺有富.改进表架的千分表法测定岩石弹性模量[J].人民珠江,1998,6:9-11(HE Youfu.Determination of elastic modulus of rock by improved micrometer[J].Pearl River,1998,6:9-11(in Chinese))
[10]宾峰.冻融循环作用下岩石动态力学特性及微观机理研究[D].中南大学,2014(BIN Feng.Study on dynamic mechanical properties and micro-structure mechanism of rock under freeze-thaw cycles[D].Central South University,2014(in Chinese))
[11] Li Diyuan,Wong L N Y,Liu Gang,et al.Influence of water content and anisotropy on the strength and deformability of low porosity meta-sedimentary rocks under triaxial compression[J].Engineering Geology,2012,126(1):46-66.
[12]张慧梅,杨更社.冻融岩石损伤劣化及力学特性试验研究[J].煤炭学报,2013,38(10):1759-1762(ZHANG Huimei,YANG Gengshe.Experimental study of damage deterioration and mechanical properties for freezingthawing rock[J].Journal of China Coal Society,2013,38(10):1759-1762(in Chinese))