我国季节冻土区路堑段路基水热特性及冻胀发展过程监测研究
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摘要
路基冻胀问题严重影响季节冻土区高速铁路的运营安全。基于哈大客运专线长春市郊区试验路段某一路堑段路基,采用级配碎石+防水土工膜+A、B组填料+防水土工膜的新型路基结构,对不同位置及深度的温度、水分及冻胀变形进行监测,分析了季节冻土区不同深度下的水热特性及冻胀随温度变化的特征。结果表明:复合土工膜对路基冻结期水分迁移起到隔断作用,对于路堑式路基而言,由于边坡汇水作用,坡脚冻深大于路基中心。路基基床上层及中层变形主要受含水量影响较大,而下层由于温度基本为正温变形主要受路基填料质量控制。
The safe operation of high-speed railway was seriously affected by the frost heave in seasonally frozen regions. Based on a cutting section of roadbed in Changchun City along Harbin-Dalian Passenger Railway Line,a newsubgrade structure with graded broken stone,waterproof geomembrane,packing and composite geomembrane was constructed. Temperature,water content and frost heave in different positions and depths were monitored and then the hydro-thermal and frost heave properties in the subgrade of seasonally frozen regions were studied. The results showed that the composite geomembrane could prevent water migration in frozen period. For the roadbed in cutting section,the frozen depth in slope toe is relative deep,deeper than that at the central of the subgrade. The primary factor was water content,which effected the frost heave in upper and middle layers,and the deformation in lower layer was controlled by the quality of filler due to the temperature was always higher than zero.
The safe operation of high-speed railway was seriously affected by the frost heave in seasonally frozen regions. Based on a cutting section of roadbed in Changchun City along Harbin-Dalian Passenger Railway Line,a newsubgrade structure with graded broken stone,waterproof geomembrane,packing and composite geomembrane was constructed. Temperature,water content and frost heave in different positions and depths were monitored and then the hydro-thermal and frost heave properties in the subgrade of seasonally frozen regions were studied. The results showed that the composite geomembrane could prevent water migration in frozen period. For the roadbed in cutting section,the frozen depth in slope toe is relative deep,deeper than that at the central of the subgrade. The primary factor was water content,which effected the frost heave in upper and middle layers,and the deformation in lower layer was controlled by the quality of filler due to the temperature was always higher than zero.
引文
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[19]Lu Yonggang,Xiao Hong,Chen Minzi.Analysis of the influence of bedding modified filler and insulation slope protection on temperature field of roadbed in seasonally frozen soil regions[J].Journal of Glaciology and Geocryology,2016,38(4):1059-1066.[陆永港,肖宏,陈民子.季节冻土区基床改性填料与保温护坡对路基温度场的影响分析[J].冰川冻土,2016,38(4):1059-1066.]
[20]Niu Fujun,Liu Hua,Niu Yonghong,et al.Experimental study of roadbed stability in cutting section along a high-speed railw ay in seasonal frozen regions[J].Chinese Journal of Rock M echanics and Engineering,2013,32(Suppl 2):4032-4040.[牛富俊,刘华,牛永红,等.季节冻土区高速铁路路堑段路基稳定性试验研究[J].岩石力学与工程学报,2013,32(增刊2):4032-4040.]
[2]Cheng Guodong.Influences of local factors on permafrost occurrence and their implications for Qinghai-Xizang Railw ay design[J].Science in China:Series D Earth Sciences,2004,47(8):704-709.[程国栋.局地因素对多年冻土分布的影响及其对青藏铁路设计的启示[J].中国科学:D辑地球科学,2003,33(6):602-607.]
[3]Liu Hua,Niu Fujun,Niu Yonghong,et al.Effect of structure style on subgrade frozen characteristics of high-speed railw ay in cold regions[J].Rock and Soil M echanics,2015,36(11):3135-3142.[刘华,牛富俊,牛永红,等.结构型式对寒区高铁路基冻结特征影响试验研究[J].岩土力学,2015,36(11):3135-3142.]
[4]Yue Zurun,Wang Tianliang,Ma Chao,et al.Frost heave control of fine round gravel fillings in deep seasonal frozen regions[J].Sciences in Cold and Arid Regions,2013,5(4):425-432.
[5]Liu Hua,Niu Fujun,Niu Yonghong,et al.Study on thermal regime of roadbed-culvert transition section along a high-speed railw ay in seasonally frozen regions[J].Cold Regions Science and Technology,2014,106/107:216-231.
[6]Zhang Sheng,Sheng Daichao,Zhao Guotang,et al.Analysis of frost heave mechanisms in a high-speed railw ay embankment[J].Canadian Geotechnical Journal,2015,53(3):520-529.
[7]Zhang Yichen,Li Xin,Zhang Xifa,et al.Research on frost heave susceptibility and classification of coarse grained soil of highw ay subgrade in seasonally frozen ground region[J].Chinese Journal of Geotechnical Engineering,2007,29(10):1522-1526.[张以晨,李欣,张喜发,等.季冻区公路路基粗粒土的冻胀敏感性及分类研究[J].岩土工程学报,2007,29(10):1522-1526.]
[8]Xu Jian,Niu Fujun,Niu Yonghong,et al.Analysis on the effect of replacing-soil method on inhibiting frost heave of railw ay roadbed in seasonal frozen soil region[J].China Railw ay Science,2011,32(5):1-7.[许健,牛富俊,牛永红,等.换填法抑制季节冻土区铁路路基冻胀效果分析[J].中国铁道科学,2011,32(5):1-7.]
[9]Shi Gangqiang,Zhao Shiyun,Li Xianming,et al.The frost heaving deformation of high-speed railw ay subgrades in cold regions:monitoring and analyzing[J].Journal of Glaciology and Geocryology,2014,36(2):360-368.[石刚强,赵世运,李先明,等.严寒地区高速铁路路基冻胀变形监测分析[J].冰川冻土,2014,36(2):360-368.]
[10]Dong Yuanhong,Niu Yonghong,Cui Weixiao,et al.Model test study on the anti-frost engineering along the Harbin-Qiqihar Passenger Dedicated Railw ay[J].Journal of Glaciology and Geocryology,2014,36(4):829-835.[董元宏,牛永红,崔维孝,等.哈尔滨-齐齐哈尔客运专线路基防冻工程模型试验研究[J].冰川冻土,2014,36(4):829-835.]
[11]Wu Zhen.Experimental study on frost heave properties of highspeed railw ay subgrade fillings in deep seasonal frozen regions[D].Shijiazhuang:Shijiazhuang Tiedao University,2013.[吴镇.深季节冻土区高速铁路路基填料冻胀特性试验研究[D].石家庄:石家庄铁道大学,2013.]
[12]Wu Lizhou,Xu Qiang,Huang Runqiu.Analysis of freezing-thaw ing test process of unsaturated clay[J].Rock and Soil M echanics,2011,32(4):1025-1028.[吴礼舟,许强,黄润秋.非饱和黏土的冻胀融沉过程分析[J].岩土力学,2011,32(4):1025-1028.]
[13]Li Shuwu,Nie Dexin,Wu Jichun.Experimental research on frost heaving and moisture changing w ith a type of silty clay[J].Resources Environment&Engineering,2010,24(5):615-618.[李树武,聂德新,吴吉春.某类粉质黏土冻胀与水分变化的试验研究[J].资源环境与工程,2010,24(5):615-618.]
[14]Li Ping,Xu Xiaozu,Chen Fengfeng.State and progress of research on the frozen fringe and frost heave prediction models[J].Journal of Glaciology and Geocryology,2000,22(1):90-95.[李萍,徐敩祖,陈峰峰.冻结缘和冻胀模型的研究现状与进展[J].冰川冻土,2000,22(1):90-95.]
[15]Xu Xiaozu,Wang Jiacheng,Zhang Lixin.Physics of frozen soils[M].Beijing:Science Press,2001.[徐敩祖,王家澄,张立新.冻土物理学[M].北京:科学出版社,2001.]
[16]Leng Jingyan,Fu Xinping,Yang Junjie.Experimental research of the subgrade padding frost heaving of high-speed railw ay[J].Journal of Glaciology and Geocryology,2015,37(2):440-445.[冷景岩,付新平,杨军杰.高速铁路路基填料冻胀试验研究[J].冰川冻土,2015,37(2):440-445.]
[17]Niu Fujun,Lin Zhanju,Wu Xuyang,et al.Characteristics of subgrade's temperature,moisture and frost heave deformation in Haomen,passenger railw ay line from Lanzhou to Xinjiang[J].Journal of Glaciology and Geocryology,2016,38(4):1074-1082.[牛富俊,林战举,吴旭阳,等.兰新客运专线浩门区间路基温度、水分及冻胀变形特征[J].冰川冻土,2016,38(4):1074-1082.]
[18]Zhang Dongqing,Zhang Xifa,Xin Degang,et al.Investigation on frost damage and w ater-bearing condition of expressw ay subgrade in seasonally frozen soil region[J].Highw ay,2004(2):140-146.[张冬青,张喜发,辛德刚,等.季节性冻土区高速公路路基含水状况与冻害调查[J].公路,2004(2):140-146.]
[19]Lu Yonggang,Xiao Hong,Chen Minzi.Analysis of the influence of bedding modified filler and insulation slope protection on temperature field of roadbed in seasonally frozen soil regions[J].Journal of Glaciology and Geocryology,2016,38(4):1059-1066.[陆永港,肖宏,陈民子.季节冻土区基床改性填料与保温护坡对路基温度场的影响分析[J].冰川冻土,2016,38(4):1059-1066.]
[20]Niu Fujun,Liu Hua,Niu Yonghong,et al.Experimental study of roadbed stability in cutting section along a high-speed railw ay in seasonal frozen regions[J].Chinese Journal of Rock M echanics and Engineering,2013,32(Suppl 2):4032-4040.[牛富俊,刘华,牛永红,等.季节冻土区高速铁路路堑段路基稳定性试验研究[J].岩石力学与工程学报,2013,32(增刊2):4032-4040.]