寒冷地区路基冻胀的计算模型和方法研究
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摘要
从路基冻胀机理出发,把冻胀过程的路基土体划分为3个区段:冻土区,冻结缘区和未冻土区,充分考虑冻结缘区的桥连作用,把3区段连在一起构成了桥连式冻胀模型。根据各区段的本质特征和主导作用,建立了相应的控制方程,并用连接条件构成一个完整的求解体系,采用半解析数值法对路基冻胀可进行定量计算。通过实例计算证明,结果与实例值吻合较好,说明本文模型和方法是有效的。
From the roadbed freezing expansion principle,the frost heave process of roadbed soil is classified into three sections: the frozen zone,freezing margin zone and Non-freeze zone.Full consideration of link function of freezing margin zone,the bridge-link frost heaving model was proposed in this paper.According to the different sections of the role,the control equations,and connection condition to complete solution system were established.By using the semi-analytical numerical method,the roadbed freezing expansion can be quantitatively calculated.The good agreement between the calculation results and observed data show the model and method proposed in this paper are valid.
From the roadbed freezing expansion principle,the frost heave process of roadbed soil is classified into three sections: the frozen zone,freezing margin zone and Non-freeze zone.Full consideration of link function of freezing margin zone,the bridge-link frost heaving model was proposed in this paper.According to the different sections of the role,the control equations,and connection condition to complete solution system were established.By using the semi-analytical numerical method,the roadbed freezing expansion can be quantitatively calculated.The good agreement between the calculation results and observed data show the model and method proposed in this paper are valid.
引文
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[5]冷毅飞,张喜发,张冬青.季节冻土区调整公路地基中的水分迁移变化[J].冰川冻土,2006,28(2):211-216.LENG Yi-fei,ZHANG Xi-fa,ZHANG Dong-qing.Study offrost heaving susceptibility of fine-grain soil of highwaysubgrade in seasonally frozen ground regions[J].Journalof Glaciology and Geocryology,2006,28(2):211-216.
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[7]徐学祖,邓友生.冻土中水分迁移的实验研究[M].北京:科学出版社,1991.XU Xiao-zu,DENG You-sheng.Experimental study onwater migration in freezing and frozen soil[M].Beijing:Science Press,1991.[8]Konrad J-M,Morgensern N Q.Effects of applied pres-sure on freezing soils[M].Can Geotech J,1982,19:494-505.
[9]李南生,李洪升,丁德文.浅埋集(输)油管线基础相变温度场奇异摄动解法[C]//中国工程热物理学会编,中国工程热物理学会传热学术会议论文集,北京:中国工程热物理学会,1996,Ⅳ:43-50.LI Nan-sheng,LI Hong-sheng,DING De-wen.The queerturbulent method of alternation temperature field for oilpipelines buried in frozen ground area[C]//The proceed-ing of symposium of China engineering heat-physics as-sociation in 1996,Beijing:China Ocean Press,1996 ID:43-50.
[2]王丽霞.冻土动力性质与冻土场地路基地震反应研究[D].哈尔滨:哈尔滨工业大学,2005:14-25.WANG li-xia.Study on frozen dynamic performance andearthquake response of frozen site embankment[D].Har-bin:Harbin Institute of Technology,2005:14-25.
[3]安维东,吴紫汪,朱元林,等.冻土温度水分应力及相互作用[M].兰州:兰州大学出版社,1989.AN Wei-dong,WUZi-wang,ZHUYuan-lin,et al.Interac-tion among temperature,moisture and stress fielde in fro-zen soil[M].Lanzhou:Lanzhou University Press,1989.
[4]俞祁浩,刘永智,童长江.青藏公路路基变形分析[J].冰川冻土,2002,24(5):623-627.YU Qi-hao,LIU Yong-zhi,TONG Chang-jiang.Analysisof the subgrade deformation of the Qinghai-Tibetan High-way[J].Journal of Glaciology and Geocryology,2002,24(5):623-627.
[5]冷毅飞,张喜发,张冬青.季节冻土区调整公路地基中的水分迁移变化[J].冰川冻土,2006,28(2):211-216.LENG Yi-fei,ZHANG Xi-fa,ZHANG Dong-qing.Study offrost heaving susceptibility of fine-grain soil of highwaysubgrade in seasonally frozen ground regions[J].Journalof Glaciology and Geocryology,2006,28(2):211-216.
[6]毛雪松,王秉刚,胡长顺,等.多年冻土区路基变形场和应力场数值分析[J].冰川冻土,2006,28(3):396-400.MAO Xue-song,WANG Bing-gang,HU Chang-shun,etal.Numerical analysis of deformation and stress fields inpermafrost regions[J].Journal of Glaciology and Geocry-ology,2006,28(3):396-400.
[7]徐学祖,邓友生.冻土中水分迁移的实验研究[M].北京:科学出版社,1991.XU Xiao-zu,DENG You-sheng.Experimental study onwater migration in freezing and frozen soil[M].Beijing:Science Press,1991.[8]Konrad J-M,Morgensern N Q.Effects of applied pres-sure on freezing soils[M].Can Geotech J,1982,19:494-505.
[9]李南生,李洪升,丁德文.浅埋集(输)油管线基础相变温度场奇异摄动解法[C]//中国工程热物理学会编,中国工程热物理学会传热学术会议论文集,北京:中国工程热物理学会,1996,Ⅳ:43-50.LI Nan-sheng,LI Hong-sheng,DING De-wen.The queerturbulent method of alternation temperature field for oilpipelines buried in frozen ground area[C]//The proceed-ing of symposium of China engineering heat-physics as-sociation in 1996,Beijing:China Ocean Press,1996 ID:43-50.
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