循环荷载下高温冻土的变形和强度特性
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摘要
对-1℃的冻土试样在频率为3,5,8 Hz的循环荷载下进行了单轴压缩试验,探讨了冻土在循环荷载下的累积变形和动强度。结果表明:循环荷载作用下冻土的累积变形大小由加载的最大动应力大小决定,同一频率下加载的最大动应力越大,相同循环次数时的累积应变越大;根据加载的最大动应力的大小,累积应变与循环次数的关系曲线可表现为破坏型、稳定型和过渡型3种形态之一。加载频率对冻土累积应变的影响规律复杂,且受加载的最大动应力影响;当最大动应力较小时,频率的影响不明显;当最大动应力比较适中时,大体上频率越高,累积应变越大;当最大动应力比较大时,频率越高,累积应变越小。在3%,5%和10%的破坏应变下,频率为8 Hz时冻土的动强度最大,而3 Hz和5 Hz的动强度比较接近。
The uniaxial compression tests on frozen soils under-1℃ and cyclic loading are carried out.The vibration frequencies are 3,5 and 8 Hz.The cumulative deformation and dynamic strength of the frozen soils under cyclic loading are studied.The results show that the cumulative deformation of the frozen soils under cyclic loading is dependent on the maximum cyclic stress.When the frequency is the same,the larger the maximum cyclic stress,the larger the cumulative strain.According to the maximum cyclic stress,the changing curves of the cumulative strain with cyclic number can be divided into failure type,stable type and transition type.The loading frequency affects the cumulative strain in a complex way.When the maximum cyclic stress is small,the frequency has slight effect on the cumulative strain.When the maximum cyclic stress is moderate,on the whole,the higher the frequency,the greater the cumulative strain.When the maximum cyclic stress is large,the higher the frequency,the smaller the cumulative strain.When the failure strains are 3%,5% and 10%,the dynamic strength is the greatest under loading frequency of 8 Hz,and the dynamic strength under 3 Hz is close to that under 5 Hz.
The uniaxial compression tests on frozen soils under-1℃ and cyclic loading are carried out.The vibration frequencies are 3,5 and 8 Hz.The cumulative deformation and dynamic strength of the frozen soils under cyclic loading are studied.The results show that the cumulative deformation of the frozen soils under cyclic loading is dependent on the maximum cyclic stress.When the frequency is the same,the larger the maximum cyclic stress,the larger the cumulative strain.According to the maximum cyclic stress,the changing curves of the cumulative strain with cyclic number can be divided into failure type,stable type and transition type.The loading frequency affects the cumulative strain in a complex way.When the maximum cyclic stress is small,the frequency has slight effect on the cumulative strain.When the maximum cyclic stress is moderate,on the whole,the higher the frequency,the greater the cumulative strain.When the maximum cyclic stress is large,the higher the frequency,the smaller the cumulative strain.When the failure strains are 3%,5% and 10%,the dynamic strength is the greatest under loading frequency of 8 Hz,and the dynamic strength under 3 Hz is close to that under 5 Hz.
引文
[1]MONISMITH C L,OGAWA N,FREEME C R.Permanentdeformation characteristics of subgrade soils due to repeatedloading[R]//Transportation research record 537.WashingtonD C:Transportation Research Board,1975:1–17.
[2]LI D Q,SELIG E T.Cumulative plastic deformation for finegrained subgrade soils[J].Journal of GeotechnicalEngineering,1996,122(12):1006–1013.
[3]CHAI J C,MIURA N.Traffic load induced permanentdeformation of road on soft subsoil[J].Journal ofGeotechnical and Geoenvironmental Engineering,2002,128(11):907–916.
[4]蔡英,曹新文.重复加载下路基填土的临界动应力和永久变形初探[J].西南交通大学学报,1996,31(1):1–5.(CAI Ying,CAO Xin-wen.Study of the critical dynamicstress and permanent strain of the subgrade-soil under therepeated load[J].Journal of Southwest Jiaotong University,1996,31(1):1–5.(in Chinese))
[5]KARG C,HAEGEMAN W.Elasto-plastic long-term behaviorof granular soils:experimental investigation[J].SoilDynamics and Earthquake Engineering,2009,29(2):155–172.
[6]MILLER G A,TEH S Y,LI D Q,et al.Cyclic shear strength ofsoft railroad subgrade[J].Journal of Geotechnical andGeoenvironmental Engineering,2000,126(7):139–147.
[7]陈颖平,黄博,陈云敏.循环荷载作用下结构性软黏土的变形和强度特性[J].岩土工程学报,2005,27(9):1065–1071.(CHEN Ying-ping,HUANG Bo,CHEN Yun-min.Deformation and strength of structural soft clay under cyclicloading[J].Chinese Jounal of Geotechnical Engineering,2005,27(9):1065–1071.(in Chinese))
[8]张勇,孔令伟,郭爱国,等.循环荷载下饱和软黏土的累积塑性应变试验研究[J].岩土力学,2009,30(6):1542–1548.(ZHANG Yong,KONG Ling-wei,GUO Ai-guo,et al.Cumulative plastic strain of saturated soft clay under cyclicloading[J].Rock and Soil Mechanics,2009,30(6):1542–1548.(in Chinese))
[9]蒋关鲁,房立凤,王智猛,等.红层泥岩路基填料动强度和累积变形特性试验研究[J].岩土工程学报,2010,32(1):124–129.(JIANG Guan-lu,FANG Li-feng,WANGZhi-meng,et al.Experimental study on dynamic strength andaccumulated deformation characteristics of red-mudstonefilling[J].Chinese Journal of Geotechnical Engineering,2010,32(1):124–129.(in Chinese))
[10]丁祖德,彭立敏,施成华,等.循环荷载作用下富水砂质泥岩动变形特性试验研究[J].岩土工程学报,2012,34(3):534–539.(DING Zu-de,PENG Li-min,SHI Cheng-hua,etal.Experimental study on dynamic deformation behaviors ofwater-rich sandy mudstone under cyclic loading[J].ChineseJournal of Geotechnical Engineering,2012,34(3):534–539.(in Chinese))
[11]朱元林,何平,张家懿,等.冻土在振动荷载作用下的三轴蠕变模型[J].自然科学进展,1998,8(1):60–62.(ZHU Yuan-lin,HE Ping,ZHANG Jia-yi,et al.Triaxial creepmodel of frozen soil under dynamic loading[J].Progress inNatural Science,1998,8(1):60–62.(in Chinese))
[12]赵淑萍,何平,朱元林,等.冻结砂土在动荷载下的蠕变特征[J].冰川冻土,2002,24(3):270–274.(ZHAOShu-ping,HE Ping,ZHU Yuan-lin,et al.Creepcharacteristics of frozen sand under dynamic loading[J].Journal of Glaciology and Geocryology,2002,24(3):270–274.(in Chinese))
[13]吴志坚,王兰民,马巍,等.地震荷载作用下冻土的动力学参数试验研究[J].西北地震学报,2003,25(3):210–214.(WU Zhi-jian,WANG Lan-min,MA Wei,etal.Laboratory study on dynamics parameters of frozen soilunder seismic dynamic loading[J].NorthwesternSeismological Journal,2003,25(3):210–214.(in Chinese))
[14]王丽霞,凌贤长,徐学燕,等.青藏铁路冻结粉质黏土动静三轴试验对比[J].岩土工程学报,2005,27(2):202–205.(WANG Li-xia,LING Xian-zhang,XU Xue-yan,et al.Comparison of dynamic and static triaxial test on frozen siltyclay of Qinghai—Tibet railway[J].Chinese Journal ofGeotechnical Engineering,2005,27(2):202–205.(inChinese))
[15]赵淑萍,何平,朱元林,等.冻结粉土的动静蠕变特征比较[J].岩土工程学报,2006,28(12):2160–2163.(ZHAOShu-ping,HE Ping,ZHU Yuan-lin,et al.Comparisonbetween dynamic and static creep characteristics of frozensilt[J].Chinese Journal of Geotechnical Engineering,2006,28(12):2160–2163.(in Chinese))
[16]张淑娟,赖远明,李双洋,等.冻土动强度特性试验研究[J].岩土工程学报,2008,30(4):595–599.(ZHANGShu-juan,LAI Yuan-ming,LI Shuang-yang,et al.Dynamicstrength of frozen soils[J].Chinese Journal of GeotechnicalEngineering,2008,30(4):595–599.(in Chinese))
[17]ZHU Zhan-yuan,LING Xian-zhang,CHEN Shi-jun,et al.Experimental investigation on the train-induced subsidenceprediction model of Beiluhe permafrost subgrade along theQinghai–Tibet Railway in China[J].Cold Regions Scienceand Technology,2010,62(1):67–75.
[18]张向东,刘家顺,兰常玉,等.辽西地区冻风积土动力特性试验分析[J].中国地质灾害与防治学报,2011,22(2):135–142.(ZHANG Xiang-dong,LIU Jia-shun,LANChang-yu,et al.Dynamic test analysis of frozen aeolian soilunder earthquake loading[J].The Chinese Journal ofGeological Hazard and Control,2011,22(2):135–142.(inChinese))
[19]高志华,石坚,张淑娟,等.高含冰量冻土动强度和残余应变的试验研究[J].冰川冻土,2009,31(6):1143–1149.(GAO Zhi-hua,SHI Jian,ZHANG Shu-juan,et al.Experimental study of the dynamic strength characteristicsand residual strain of ice-rich frozen soil[J].Journal ofGlaciology and Geocryology,2009,31(6):1143–1149.(inChinese))
[20]焦贵德,马巍,赵淑萍,等.高温冻结粉土的累积应变和临界动应力[J].岩石力学与工程学报,2011,30(增刊1):3193–3198.(JIAO Gui-de,ZHAO Shu-ping,MA Wei,et al.Accumulated strain and critical dynamic stress of frozen siltat high temperature[J].Chinese Journal of Rock Mechanicsand Engineering,2011,30(S1):3193–3198.(in Chinese))
[21]宫全美,罗喆,袁建议.提速铁路基床长期累积沉降及等效循环荷载试验研究[J].铁道学报,2009,31(2):88–93.(GONG Quan-mei,LUO Zhe,YUAN Jian-yi.Experimentalstudy on long-term cumulative settlement and equivalentcyclic load of speed-up railway subgrade soil[J].Journal ofthe China Railway Society,2009,31(2):88–93.(in Chinese))
[2]LI D Q,SELIG E T.Cumulative plastic deformation for finegrained subgrade soils[J].Journal of GeotechnicalEngineering,1996,122(12):1006–1013.
[3]CHAI J C,MIURA N.Traffic load induced permanentdeformation of road on soft subsoil[J].Journal ofGeotechnical and Geoenvironmental Engineering,2002,128(11):907–916.
[4]蔡英,曹新文.重复加载下路基填土的临界动应力和永久变形初探[J].西南交通大学学报,1996,31(1):1–5.(CAI Ying,CAO Xin-wen.Study of the critical dynamicstress and permanent strain of the subgrade-soil under therepeated load[J].Journal of Southwest Jiaotong University,1996,31(1):1–5.(in Chinese))
[5]KARG C,HAEGEMAN W.Elasto-plastic long-term behaviorof granular soils:experimental investigation[J].SoilDynamics and Earthquake Engineering,2009,29(2):155–172.
[6]MILLER G A,TEH S Y,LI D Q,et al.Cyclic shear strength ofsoft railroad subgrade[J].Journal of Geotechnical andGeoenvironmental Engineering,2000,126(7):139–147.
[7]陈颖平,黄博,陈云敏.循环荷载作用下结构性软黏土的变形和强度特性[J].岩土工程学报,2005,27(9):1065–1071.(CHEN Ying-ping,HUANG Bo,CHEN Yun-min.Deformation and strength of structural soft clay under cyclicloading[J].Chinese Jounal of Geotechnical Engineering,2005,27(9):1065–1071.(in Chinese))
[8]张勇,孔令伟,郭爱国,等.循环荷载下饱和软黏土的累积塑性应变试验研究[J].岩土力学,2009,30(6):1542–1548.(ZHANG Yong,KONG Ling-wei,GUO Ai-guo,et al.Cumulative plastic strain of saturated soft clay under cyclicloading[J].Rock and Soil Mechanics,2009,30(6):1542–1548.(in Chinese))
[9]蒋关鲁,房立凤,王智猛,等.红层泥岩路基填料动强度和累积变形特性试验研究[J].岩土工程学报,2010,32(1):124–129.(JIANG Guan-lu,FANG Li-feng,WANGZhi-meng,et al.Experimental study on dynamic strength andaccumulated deformation characteristics of red-mudstonefilling[J].Chinese Journal of Geotechnical Engineering,2010,32(1):124–129.(in Chinese))
[10]丁祖德,彭立敏,施成华,等.循环荷载作用下富水砂质泥岩动变形特性试验研究[J].岩土工程学报,2012,34(3):534–539.(DING Zu-de,PENG Li-min,SHI Cheng-hua,etal.Experimental study on dynamic deformation behaviors ofwater-rich sandy mudstone under cyclic loading[J].ChineseJournal of Geotechnical Engineering,2012,34(3):534–539.(in Chinese))
[11]朱元林,何平,张家懿,等.冻土在振动荷载作用下的三轴蠕变模型[J].自然科学进展,1998,8(1):60–62.(ZHU Yuan-lin,HE Ping,ZHANG Jia-yi,et al.Triaxial creepmodel of frozen soil under dynamic loading[J].Progress inNatural Science,1998,8(1):60–62.(in Chinese))
[12]赵淑萍,何平,朱元林,等.冻结砂土在动荷载下的蠕变特征[J].冰川冻土,2002,24(3):270–274.(ZHAOShu-ping,HE Ping,ZHU Yuan-lin,et al.Creepcharacteristics of frozen sand under dynamic loading[J].Journal of Glaciology and Geocryology,2002,24(3):270–274.(in Chinese))
[13]吴志坚,王兰民,马巍,等.地震荷载作用下冻土的动力学参数试验研究[J].西北地震学报,2003,25(3):210–214.(WU Zhi-jian,WANG Lan-min,MA Wei,etal.Laboratory study on dynamics parameters of frozen soilunder seismic dynamic loading[J].NorthwesternSeismological Journal,2003,25(3):210–214.(in Chinese))
[14]王丽霞,凌贤长,徐学燕,等.青藏铁路冻结粉质黏土动静三轴试验对比[J].岩土工程学报,2005,27(2):202–205.(WANG Li-xia,LING Xian-zhang,XU Xue-yan,et al.Comparison of dynamic and static triaxial test on frozen siltyclay of Qinghai—Tibet railway[J].Chinese Journal ofGeotechnical Engineering,2005,27(2):202–205.(inChinese))
[15]赵淑萍,何平,朱元林,等.冻结粉土的动静蠕变特征比较[J].岩土工程学报,2006,28(12):2160–2163.(ZHAOShu-ping,HE Ping,ZHU Yuan-lin,et al.Comparisonbetween dynamic and static creep characteristics of frozensilt[J].Chinese Journal of Geotechnical Engineering,2006,28(12):2160–2163.(in Chinese))
[16]张淑娟,赖远明,李双洋,等.冻土动强度特性试验研究[J].岩土工程学报,2008,30(4):595–599.(ZHANGShu-juan,LAI Yuan-ming,LI Shuang-yang,et al.Dynamicstrength of frozen soils[J].Chinese Journal of GeotechnicalEngineering,2008,30(4):595–599.(in Chinese))
[17]ZHU Zhan-yuan,LING Xian-zhang,CHEN Shi-jun,et al.Experimental investigation on the train-induced subsidenceprediction model of Beiluhe permafrost subgrade along theQinghai–Tibet Railway in China[J].Cold Regions Scienceand Technology,2010,62(1):67–75.
[18]张向东,刘家顺,兰常玉,等.辽西地区冻风积土动力特性试验分析[J].中国地质灾害与防治学报,2011,22(2):135–142.(ZHANG Xiang-dong,LIU Jia-shun,LANChang-yu,et al.Dynamic test analysis of frozen aeolian soilunder earthquake loading[J].The Chinese Journal ofGeological Hazard and Control,2011,22(2):135–142.(inChinese))
[19]高志华,石坚,张淑娟,等.高含冰量冻土动强度和残余应变的试验研究[J].冰川冻土,2009,31(6):1143–1149.(GAO Zhi-hua,SHI Jian,ZHANG Shu-juan,et al.Experimental study of the dynamic strength characteristicsand residual strain of ice-rich frozen soil[J].Journal ofGlaciology and Geocryology,2009,31(6):1143–1149.(inChinese))
[20]焦贵德,马巍,赵淑萍,等.高温冻结粉土的累积应变和临界动应力[J].岩石力学与工程学报,2011,30(增刊1):3193–3198.(JIAO Gui-de,ZHAO Shu-ping,MA Wei,et al.Accumulated strain and critical dynamic stress of frozen siltat high temperature[J].Chinese Journal of Rock Mechanicsand Engineering,2011,30(S1):3193–3198.(in Chinese))
[21]宫全美,罗喆,袁建议.提速铁路基床长期累积沉降及等效循环荷载试验研究[J].铁道学报,2009,31(2):88–93.(GONG Quan-mei,LUO Zhe,YUAN Jian-yi.Experimentalstudy on long-term cumulative settlement and equivalentcyclic load of speed-up railway subgrade soil[J].Journal ofthe China Railway Society,2009,31(2):88–93.(in Chinese))
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