兰新高速铁路高寒地段路基温度场数值模拟分析
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摘要
兰新高铁浩门至大梁区间所处地区海拔高,气温低,冻结期长,属于深季节性冻土区。为解决该区间路基冻害问题,依据当地气候条件,运用ANSYS有限元分析软件,对低路堤、零断面换填路基及不同深度处铺设保温材料的路基温度场进行数值模拟,分析路基冻结深度的变化规律和最大冻结深度,为高寒区高速铁路路基冻害防治措施设计提供参考。研究表明:(1)由于兰新高铁浩门至大梁区间海拔高、冬季冻结时间长、气温低等原因,导致路基冻结深度大;(2)零断面换填路基实测地温和数值模拟计算结果基本相符,所选计算模型、参数等可以为其他相同条件断面数值模拟分析采用;(3)铺设保温板路基温度场较未铺设保温板的0℃线上移,冻结深度增加速率变小,最大冻结深度明显减小,路基保温效果较好;(4)由于路基边坡、基床以下部位土层性质、厚度、热物理参数等影响,低路堤最大冻结深度比零断面换填路基大。
Haomen-Daliang section of Lanzhou-Urumqi high-speed railway is high in altitude, low in temperature and long in freezing period in winter, belonging to seasonal frozen region with deep frost depth. In order to solve the problem of subgrade freezing damage in this area, temperature fields of subgrade with low embankment, zero-height subgrade and thermal insulation material at different depths are simulated with ANSYS finite element analysis software according to the local climate conditions. The variation rules of subgrade freezing depth and the maximum freezing depth are analyzed so as to provide references for the design of prevention and control measures against the frost damage of the subgrade of high-speed railway in the alpine and cold region. Research results show that:(1) The frozen depth of subgrade is caused mainly by the high altitude, long freezing time and low temperature.(2) The subgrade temperature field measurements are basically consistent with the numerical simulations, so the selected calculation model and parameters can be used for numerical simulation and analysis of other sections under the same condition.(3) Zero centigrade line in the temperature field of subgrade with thermal insulation board moves up, the increase rate of frozen depth is getting smaller, the maximum freezing depth decreases obviously, and the heat preservation effect of the subgrade is good.(4) Owing to the influence of embankment slope, soil property, thickness and thermal physics parameters below the roadbed, the maximum freezing depth of low embankment is larger than that of zero-height section.
Haomen-Daliang section of Lanzhou-Urumqi high-speed railway is high in altitude, low in temperature and long in freezing period in winter, belonging to seasonal frozen region with deep frost depth. In order to solve the problem of subgrade freezing damage in this area, temperature fields of subgrade with low embankment, zero-height subgrade and thermal insulation material at different depths are simulated with ANSYS finite element analysis software according to the local climate conditions. The variation rules of subgrade freezing depth and the maximum freezing depth are analyzed so as to provide references for the design of prevention and control measures against the frost damage of the subgrade of high-speed railway in the alpine and cold region. Research results show that:(1) The frozen depth of subgrade is caused mainly by the high altitude, long freezing time and low temperature.(2) The subgrade temperature field measurements are basically consistent with the numerical simulations, so the selected calculation model and parameters can be used for numerical simulation and analysis of other sections under the same condition.(3) Zero centigrade line in the temperature field of subgrade with thermal insulation board moves up, the increase rate of frozen depth is getting smaller, the maximum freezing depth decreases obviously, and the heat preservation effect of the subgrade is good.(4) Owing to the influence of embankment slope, soil property, thickness and thermal physics parameters below the roadbed, the maximum freezing depth of low embankment is larger than that of zero-height section.
引文
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[17]闫宏业,蔡德钩,张千里,等.铁路路基冻害防治保温技术研究[J].铁道建筑,2015(1):51-55.
[18]许健,牛富俊,李爱敏,等.季节冻土区保温法抑制铁路路基冻胀效果研究[J].铁道学报,2010,32(6):124-131.
[19]肖伟.季节冻土区高速铁路路基温度场及保温措施研究[D].北京:北京交通大学,2014.
[20]常祥.季节性冻土区客运专线路基热力耦合计算分析[J].铁道工程学报,2013(10):31-35,54.
[21]岳祖润,程佳.季节性冻土地区保温护道路基温度场数值模拟[J].石家庄铁道大学学报(自然科学版),2015,28(3):25-29.
[2] 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.
[3] 张玉芝,杜彦良,孙宝臣.季节性冻土地区高速铁路路基地温分布规律研究[J].岩石力学与工程学报,2014,33(6):1286-1296.
[4] 韩春鹏,何东坡,程培峰,等.寒区公路路基温度场的自动监测与特性[J].长安大学学报(自然科学版),2011,31(3):21-26.
[5] 司剑锋.冻土路基温度场分布的试验研究[J].铁道标准设计,2006(2):33-35.
[6] 朱林楠.高原冻土区不同下垫面的附面层研究[J].冰川冻土,1988(1):8-14.
[7] 白青波,李旭,田亚护.路基温度场长期模拟中的地表热边界条件研究[J].岩土工程学报,2015,37(6):1142-1149.
[8] 王铁行,胡长顺,王秉纲,等.考虑多种因素的冻土路基温度场有限元方法[J].中国公路学报,2000(4):10-13.
[9] 易鑫,喻文兵,陈琳,等.边界条件对多年冻土路基热稳定性的影响分析[J].冰川冻土,2014,36(2):369-375.
[10] 李彬嘉,晏启祥,曾勤,等.冰-水相变对寒区隧道动态温度场影响研究[J].铁道标准设计,2017,61(10):90-94.
[11] 韩铠屹,罗承平,刘源.寒冷地区铁路客运专线路基温度场数值模拟[J].武汉大学学报(工学版),2015,48(2):207-211.
[12] 马勤国,赖远明,吴道勇.多年冻土区高等级公路路基温度场研究[J].中南大学学报(自然科学版),2016,47(7):2415-2423.
[13] 毛雪松,胡长顺,侯仲杰.冻土路基温度场室内足尺模型试验[J].长安大学学报(自然科学版),2004(1):30-33.
[14] 董连成,徐禛,师黎静,等.季冻区铁路路基温度场的数值模拟[J].黑龙江科技大学学报,2017,27(6):636-641.
[15] 梁波,刘德仁,张贵生.基于温度场的冻土路基变形数值分析及对比[J].地下空间与工程学报,2010,6(2):276-282.
[16]吕菲.季节冻土区高速铁路路基保温措施效果研究[J].冰川冻土,2016,38(1):115-120.
[17]闫宏业,蔡德钩,张千里,等.铁路路基冻害防治保温技术研究[J].铁道建筑,2015(1):51-55.
[18]许健,牛富俊,李爱敏,等.季节冻土区保温法抑制铁路路基冻胀效果研究[J].铁道学报,2010,32(6):124-131.
[19]肖伟.季节冻土区高速铁路路基温度场及保温措施研究[D].北京:北京交通大学,2014.
[20]常祥.季节性冻土区客运专线路基热力耦合计算分析[J].铁道工程学报,2013(10):31-35,54.
[21]岳祖润,程佳.季节性冻土地区保温护道路基温度场数值模拟[J].石家庄铁道大学学报(自然科学版),2015,28(3):25-29.