长期循环荷载下冻土内部温度变化的试验研究
|
摘要
对-0.5、-1.0、-1.5℃三种温度下的冻土试样进行单轴循环压缩试验,每5秒测试一次试样内部的温度,得到了不同振动频率、动应力幅值下冻土试样内部温度随振动时间变化的曲线。结果表明:在循环荷载作用下冻土内部温度会升高,动应力幅值越大,温升速率越大;在一定动应力幅值范围内,随着振动频率的增大,温升速率增大;温升幅值受土样是否破坏以及达到破坏的时间长短影响,在一定动应力幅值下,适中的某一振动频率下其内部温升幅值最大;冻土试样的破坏受其内部温度升高的影响,如果冻土试样内部温度不断升高,试样最后将会发生破坏;而不会破坏的试样内部温度升高到一定值后保持稳定或开始下降,这是由于试样和所处环境之间的热交换引起的。
Uniaxial dynamic compression tests on frozen soil were carried out under different cyclic loadings at-0.5℃,-1.0℃,-1.5℃.The temperature of specimen was measured every 5 second during the compression test.The relation curves between the temperature change of specimen and vibration time at different dynamic stress amplitudes and different frequencies are obtained.The results show that the temperature of the specimen will rise under cyclic loadings.The higher dynamic stress amplitude is,the higher temperature rising rate is.When dynamic stress amplitude is in some range,the higher vibration frequency is,the higher temperature rising rate is.The temperature rising value is influenced by whether the specimen could be damaged or not in the test,and it is also influenced by the length of time coming to damage state of the specimen.When dynamic stress amplitude is in some range,the temperature rising value is the maximum under a moderate frequency.Whether the specimen could be damaged is influenced strongly by the temperature rising value for the specimen.If the temperature of the specimen rises continually,the specimen will be damaged sooner or later.The specimen will remain well if the temperature of specimen can maintain steady or decrease because of the heat exchange between the specimen and its surroundings.
Uniaxial dynamic compression tests on frozen soil were carried out under different cyclic loadings at-0.5℃,-1.0℃,-1.5℃.The temperature of specimen was measured every 5 second during the compression test.The relation curves between the temperature change of specimen and vibration time at different dynamic stress amplitudes and different frequencies are obtained.The results show that the temperature of the specimen will rise under cyclic loadings.The higher dynamic stress amplitude is,the higher temperature rising rate is.When dynamic stress amplitude is in some range,the higher vibration frequency is,the higher temperature rising rate is.The temperature rising value is influenced by whether the specimen could be damaged or not in the test,and it is also influenced by the length of time coming to damage state of the specimen.When dynamic stress amplitude is in some range,the temperature rising value is the maximum under a moderate frequency.Whether the specimen could be damaged is influenced strongly by the temperature rising value for the specimen.If the temperature of the specimen rises continually,the specimen will be damaged sooner or later.The specimen will remain well if the temperature of specimen can maintain steady or decrease because of the heat exchange between the specimen and its surroundings.
引文
[1]霍明,汪双杰,章金钊,等.含水率和温度对高含冰量冻土力学性质的影响[J].水利学报,2010,43(10):1165-1172.HUO Ming,WANG Shuang-jie,ZHANG Jin-zhao,et al.Experimental study on influences of water content andsoil[J].Journal of Hydraulic Engineering,2010,43(10):1165-1172.
[2]吴志坚,马巍,王兰民,等.地震荷载作用下温度和围压对冻土强度影响的试验研究[J].冰川冻土,2003,25(6):648-652.WU Zhi-jian,MA Wei,WANG Lan-min,et al.Laboratorystudy on the effect of temperature and confining pressureon strength of frozen soil under seismic dynamicloading[J].Journal of Glaciology and Geocryology,2003,25(6):648-652.
[3]张淑娟,赖远明,张明义,等.动荷载作用下冻土温度变化和强度损失探讨[J].冰川冻土,2006,28(1):131-135.ZHANG Shu-juan,LAI Yuan-ming,ZHANG Ming-yi,etal.Temperature change and strength descent of frozensoils under dynamic loading[J].Journal of Glaciologyand Geocryology,2006,28(1):131-135.
[4]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.ZHANG Shu-juan,LAI Yuan-ming,LI Shuang-yang,et al.Dynamic strength of frozen soils[J].Chinese Journal ofGeotechnical Engineering,2008,30(4):595-599.
[5]刘志强.动荷载作用下高温冻结粉质黏土温度演变规律研究[博士学位论文D].徐州:中国矿业大学,2008.
[6]徐学燕,仲丛利,陈亚明,等.冻土的动力特性研究及其参数确定[J].岩土工程学报,1998,20(5):77-81.XU Xue-yan,ZHONG Cong-li,CHEN Ya-ming,et al.The dynamic characteristic of frozen soil anddetermination of parameters[J].Chinese Journal ofGeotechnical Engineering,1998,20(5):77-81.
[7]LING X Z,ZHU Z Y,ZHANG F,et al.Dynamic elasticmodulus for frozen soil from the embankment on BeiluheBasin along the Qinghai-Tibet Railway[J].Cold RegionsScience and Technology,2009,57(1):7-12.
[8]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 frozensilty clay of Qinghai-Tibet railway[J].Chinese Journalof Geotechnical Engineering,2005,27(2):202-205.
[9]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.ZHAO Shu-ping,HE Ping,ZHU Yuan-lin.Comparisonbetween dynamic and static creep characteristics of frozensilt[J].Chinese Journal of Geotechnical Engineering,2006,28(12):2160-2163.
[10]朱占元,凌贤长,胡庆立,等.动力荷载长期作用下冻土振陷模型试验研究[J].岩土力学,2009,30(4):955-959.ZHU Zhan-yuan,LING Xian-zhang,HU Qing-li,et al.Experimental study of visbration excited subsidence offrozen soil under long-term dynamic loads[J].Rock andSoil Mechanics,2009,30(4):955-959.
[2]吴志坚,马巍,王兰民,等.地震荷载作用下温度和围压对冻土强度影响的试验研究[J].冰川冻土,2003,25(6):648-652.WU Zhi-jian,MA Wei,WANG Lan-min,et al.Laboratorystudy on the effect of temperature and confining pressureon strength of frozen soil under seismic dynamicloading[J].Journal of Glaciology and Geocryology,2003,25(6):648-652.
[3]张淑娟,赖远明,张明义,等.动荷载作用下冻土温度变化和强度损失探讨[J].冰川冻土,2006,28(1):131-135.ZHANG Shu-juan,LAI Yuan-ming,ZHANG Ming-yi,etal.Temperature change and strength descent of frozensoils under dynamic loading[J].Journal of Glaciologyand Geocryology,2006,28(1):131-135.
[4]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.ZHANG Shu-juan,LAI Yuan-ming,LI Shuang-yang,et al.Dynamic strength of frozen soils[J].Chinese Journal ofGeotechnical Engineering,2008,30(4):595-599.
[5]刘志强.动荷载作用下高温冻结粉质黏土温度演变规律研究[博士学位论文D].徐州:中国矿业大学,2008.
[6]徐学燕,仲丛利,陈亚明,等.冻土的动力特性研究及其参数确定[J].岩土工程学报,1998,20(5):77-81.XU Xue-yan,ZHONG Cong-li,CHEN Ya-ming,et al.The dynamic characteristic of frozen soil anddetermination of parameters[J].Chinese Journal ofGeotechnical Engineering,1998,20(5):77-81.
[7]LING X Z,ZHU Z Y,ZHANG F,et al.Dynamic elasticmodulus for frozen soil from the embankment on BeiluheBasin along the Qinghai-Tibet Railway[J].Cold RegionsScience and Technology,2009,57(1):7-12.
[8]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 frozensilty clay of Qinghai-Tibet railway[J].Chinese Journalof Geotechnical Engineering,2005,27(2):202-205.
[9]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.ZHAO Shu-ping,HE Ping,ZHU Yuan-lin.Comparisonbetween dynamic and static creep characteristics of frozensilt[J].Chinese Journal of Geotechnical Engineering,2006,28(12):2160-2163.
[10]朱占元,凌贤长,胡庆立,等.动力荷载长期作用下冻土振陷模型试验研究[J].岩土力学,2009,30(4):955-959.ZHU Zhan-yuan,LING Xian-zhang,HU Qing-li,et al.Experimental study of visbration excited subsidence offrozen soil under long-term dynamic loads[J].Rock andSoil Mechanics,2009,30(4):955-959.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心