饱和颗粒土冻胀末透镜体演变数值模拟
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摘要
基于水热耦合分离冰冻胀模型对饱和颗粒土冻胀过程中形成的末透镜体进行数值计算研究。结果表明:常压条件下,饱和粉质黏土冻胀末透镜体厚度随时间呈抛物线增长,末透镜体平均分凝速率随上覆荷载增大而线性减小;高压条件下,饱和粉质黏土、黄黏土末透镜体厚度均随上覆荷载增大呈指数规律减小,当上覆荷载达到800kPa时,末透镜体厚度分别为0.26,0.17mm,无明显冻胀量产生。
In this paper,based on separated ice model coupled heat and mass transfer,we do some research in numerical simulation on the final ice lens in frost heave of saturated soils.The results show that,in condition of low overburden pressure,final ice lens thickness of saturated silty clay increased parabolically with time,the average segregation rate decreased linearly with the increase of overburden pressure.In condition of high overburden pressure,final ice lens thickness of saturated soils decreased exponentially with the increase of overburden pressure.When overburden pressure reaches 800 kPa,final ice lens thickness are only 0.26 mm and 0.17 mm respectively in saturated silty clay and yellow clay,in other words,no significant amount of frost heave.
In this paper,based on separated ice model coupled heat and mass transfer,we do some research in numerical simulation on the final ice lens in frost heave of saturated soils.The results show that,in condition of low overburden pressure,final ice lens thickness of saturated silty clay increased parabolically with time,the average segregation rate decreased linearly with the increase of overburden pressure.In condition of high overburden pressure,final ice lens thickness of saturated soils decreased exponentially with the increase of overburden pressure.When overburden pressure reaches 800 kPa,final ice lens thickness are only 0.26 mm and 0.17 mm respectively in saturated silty clay and yellow clay,in other words,no significant amount of frost heave.
引文
[1]周幼吾,郭东信,邱国庆,等.中国冻土[M].北京:科学出版社,2000.
[2]凌盛,姚鑫,王宗盛,等.高海拔多年冻土分布特征、冻融破坏以及工程防治措施[J].工程地质学报,2014,22(S1):476-482.
[3]张国柱,夏才初,马绪光.寒区隧道地源热泵型供热系统岩土热响应试验[J].岩石力学与工程学报,2012,31(1):99-105.
[4]冯强,蒋斌松.多层介质寒区公路隧道保温层厚度计算的一种解析方法[J].岩土工程学报,2014,36(10):1879-1887.
[5]王贺,郭春香,吴亚平,等.基于弹性力学考虑冰水相变过程下多年冻土冻胀系数与冻胀率之间的关系[J].岩石力学与工程学报,2018,37(8):1-7.
[6]王永涛,王大雁,马巍,等.基于数字图像技术的土冻胀试验系统研究[J].冰川冻土,2017,39(5):1047-1056.
[7]张玉伟,谢永利,李又云,等.基于温度场时空分布特征的寒区隧道冻胀模型[J].岩土力学,2018,39(5):1625-1632.
[8]程涛,张东明,孙福申,等.季冻区山岭公路隧道冻胀力学特征数值模拟研究[J].自然灾害学报,2018,27(4):34-40.
[9]王建州,刘书幸,周国庆,等.深季节冻土地区基坑工程水平冻胀力试验研究[J].中国矿业大学学报,2018,47(4):815-821.
[10]周家作,韦昌富,李东庆,等.饱和粉土冻胀过程试验研究及数值模拟[J].岩石力学与工程学报,2017,36(2):485-495.
[11]岑国平,龙小勇,洪刚.青藏高原季冻区砂砾土冻胀特性试验[J].哈尔滨工业大学学报,2016,48(3):53-59.
[12]张婷,杨平,王效宾.浅表土人工冻土冻胀特性的研究[J].南京林业大学学报(自然科学版),2010,34(4):65-68.
[13]胡坤,周国庆,李晓俊,等.不同约束条件下土体冻胀规律[J].煤炭学报,2011,36(10):1653-1658.
[14]中国科学院兰州冰川冻土研究所.冻土的温度水分应力及其相互作用[M].兰州:兰州大学出版社,1989.
[15]胡坤.冻土水热耦合分离冰冻胀模型的发展[D].徐州:中国矿业大学,2011.
[16]ANDERSON D M,TICE A C.Predicting unfrozen water contents in frozen soils from surface area measurements[J].Highway Research Record,1972,393:12-18.
[17]徐学祖,王家澄,张立新.冻土物理学[M].北京:科学出版社,2001.
[18]NIXON J F.Discrete ice lens theory for frost heave in soil[J].Canadian Geotechnical Journal,1991,28:843-859.
[2]凌盛,姚鑫,王宗盛,等.高海拔多年冻土分布特征、冻融破坏以及工程防治措施[J].工程地质学报,2014,22(S1):476-482.
[3]张国柱,夏才初,马绪光.寒区隧道地源热泵型供热系统岩土热响应试验[J].岩石力学与工程学报,2012,31(1):99-105.
[4]冯强,蒋斌松.多层介质寒区公路隧道保温层厚度计算的一种解析方法[J].岩土工程学报,2014,36(10):1879-1887.
[5]王贺,郭春香,吴亚平,等.基于弹性力学考虑冰水相变过程下多年冻土冻胀系数与冻胀率之间的关系[J].岩石力学与工程学报,2018,37(8):1-7.
[6]王永涛,王大雁,马巍,等.基于数字图像技术的土冻胀试验系统研究[J].冰川冻土,2017,39(5):1047-1056.
[7]张玉伟,谢永利,李又云,等.基于温度场时空分布特征的寒区隧道冻胀模型[J].岩土力学,2018,39(5):1625-1632.
[8]程涛,张东明,孙福申,等.季冻区山岭公路隧道冻胀力学特征数值模拟研究[J].自然灾害学报,2018,27(4):34-40.
[9]王建州,刘书幸,周国庆,等.深季节冻土地区基坑工程水平冻胀力试验研究[J].中国矿业大学学报,2018,47(4):815-821.
[10]周家作,韦昌富,李东庆,等.饱和粉土冻胀过程试验研究及数值模拟[J].岩石力学与工程学报,2017,36(2):485-495.
[11]岑国平,龙小勇,洪刚.青藏高原季冻区砂砾土冻胀特性试验[J].哈尔滨工业大学学报,2016,48(3):53-59.
[12]张婷,杨平,王效宾.浅表土人工冻土冻胀特性的研究[J].南京林业大学学报(自然科学版),2010,34(4):65-68.
[13]胡坤,周国庆,李晓俊,等.不同约束条件下土体冻胀规律[J].煤炭学报,2011,36(10):1653-1658.
[14]中国科学院兰州冰川冻土研究所.冻土的温度水分应力及其相互作用[M].兰州:兰州大学出版社,1989.
[15]胡坤.冻土水热耦合分离冰冻胀模型的发展[D].徐州:中国矿业大学,2011.
[16]ANDERSON D M,TICE A C.Predicting unfrozen water contents in frozen soils from surface area measurements[J].Highway Research Record,1972,393:12-18.
[17]徐学祖,王家澄,张立新.冻土物理学[M].北京:科学出版社,2001.
[18]NIXON J F.Discrete ice lens theory for frost heave in soil[J].Canadian Geotechnical Journal,1991,28:843-859.