深季节冻土区路基防冻胀道砟碎石排水盲沟热状况的数值分析

doi:10.7522/j.issn.1000-0240.2015.0110

冰川冻土 ›› 2015, Vol. 37 ›› Issue (4): 991-1001.doi: 10.7522/j.issn.1000-0240.2015.0110

深季节冻土区路基防冻胀道砟碎石排水盲沟热状况的数值分析

张蔚^{1 2}, 何元庆¹, 刘婧^{1 2}

1. 中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点实验室, 甘肃兰州 730000;
2. 中国科学院大学, 北京 100049

收稿日期:2015-02-17 修回日期:2015-04-16 出版日期:2015-08-25 发布日期:2016-01-18
作者简介:张蔚(1972-), 女, 陕西城固人, 2008年于甘肃农业大学获硕士学位, 现为中国科学院寒区旱区环境与工程研究所在读博士研究生, 研究方向为冰冻圈与环境. E-mail: 13893189610@139.com.
基金资助:
冰冻圈科学国家重点实验室自主课题(SKLCS-ZZ-2015-01-03); 冻土工程国家重点实验室自主立项课题(SKLFSE-ZY-15)资助

Numerical analysis on the thermal regime around an anti-frost ballast subdrain within roadbed in deep seasonally frozen regions

ZHANG Wei^{1 2}, HE Yuanqing¹, LIU Jing^{1 2}

1. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2015-02-17 Revised:2015-04-16 Online:2015-08-25 Published:2016-01-18

摘要/Abstract

摘要： 用透水土工布包裹道砟碎石填筑的截排水纵向盲沟, 是哈尔滨-大连高速铁路(简称哈大高铁)在大开挖路堑段采用的重要的防冻胀工程措施. 由于碎石层在顶部温度较低时, 其中发生对流换热过程而强化对其下部土体的降温作用, 可能导致盲沟底部冻结而影响其防冻胀效果. 通过数值仿真软件分析了排水盲沟的温度状况, 结果表明: 对于哈大高铁的气温环境, 在不考虑积雪影响的条件下, 将发生盲沟底部排水管冻结积冰, 影响纵向盲沟防冻胀效果的问题. 在盲沟顶土层中加设0.1 m保温板能够提高盲沟底部的最低温度, 推迟起始冻结时刻, 缩短冻结时长, 但不能完全避免盲沟底部排水管的冻结问题. 在有表层保温板的条件下, 在盲沟底部换填砂层虽然不能提高盲沟碎石层的温度, 但却能有效提高盲沟底部的温度. 复合措施可以有效解决盲沟底部冻结的问题.

关键词: 深季节冻土区, 冻胀, 排水盲沟, 碎石层, 数值计算

Abstract: An important anti-frost engineering measure applied on deep cut sections of the Harbin to Dalian High Speed Railway is longitudinal subdrains constructed with ballast layer wrapped with permeable geotextile. Convective heat transfer process, which takes place when the top temperature of the ballast layer is lower, will strengthen the cooling effect on the bottom of the subdrains, and affect its anti-frost effect. The thermal regime of the subdrain and the effect of engineering measure against frozen damage to the subdrains are analyzed by using numerical simulation software. It is found that the bottom of the subdrains will freeze up, and its anti-frost effect will be affected under the environment temperature along the Harbin to Dalian High Speed Railway and ignoring snow cover. Adding an insulation board of 0.1 m thickness in the soil above the subdrains can raise the minimum temperature at the bottom of the subdrains, postpone the starting time of frost and shorten the frozen period, but cannot completely avoid the subdrain frost. The temperature of the ballast will not increase apparently by replacing the lower part of the ballast with sand, in addition to an insulation board of 0.1 m thickness added to the top of the ballast, but it can effectively raise the temperature at the bottom of the subdrains. This compound measures are able to satisfactorily solve the frost problem of subdrains.

Key words: deep seasonally frozen ground regions, frost heave, ballast, subdrain, numerical calculation

中图分类号:

P642.14

张蔚, 何元庆, 刘婧. 深季节冻土区路基防冻胀道砟碎石排水盲沟热状况的数值分析[J]. 冰川冻土, 2015, 37(4): 991-1001.

ZHANG Wei, HE Yuanqing, LIU Jing. Numerical analysis on the thermal regime around an anti-frost ballast subdrain within roadbed in deep seasonally frozen regions[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2015, 37(4): 991-1001.

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深季节冻土区路基防冻胀道砟碎石排水盲沟热状况的数值分析

Numerical analysis on the thermal regime around an anti-frost ballast subdrain within roadbed in deep seasonally frozen regions

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