多年冻土区热棒路基应用效果

刘戈; 汪双杰; 金龙; 董元宏; 袁堃

doi:10.19818/j.cnki.1671-1637.2016.04.006

多年冻土区热棒路基应用效果

doi: 10.19818/j.cnki.1671-1637.2016.04.006

中交第一公路勘察设计研究院有限公司, 高寒高海拔地区道路工程安全与健康国家重点实验室, 陕西西安 710075

基金项目:

国家科技支撑计划项目 2014BAG05B03

国家科技支撑计划项目 2014BAG05B07

交通运输部建设科技项目 2013 318 490 010

交通运输部应用基础研究项目 2014 319 495 090

详细信息

作者简介:
刘戈(1979-), 男, 山东泰安人, 中交第一公路勘察设计研究院有限公司高级工程师, 工学博士, 从事多年冻土路基工程研究

中图分类号: U416.168
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出版历程
- 收稿日期: 2016-06-10
- 刊出日期: 2016-08-25

Applicable effect of thermosyphon subgrades in permafrost regions

State Key Laboratory of Road Engineering Safety and Health in Cold and High-Altitude Regions, CCCC First Highway Consultants Co., Ltd., Xi'an 710075, Shaanxi, China

More Information

Author Bio:
LIU Ge(1979-), male, senior engineer, PhD, +86-29-87600996, 416954907@qq.com

Article Text (Baidu Translation)

摘要

摘要: 为了研究热棒在青藏公路多年冻土区的应用效果, 基于楚玛尔河试验监测场地8年的地温观测数据, 以水平温度梯度为指标, 分析了不同时期热棒的有效半径。为了提高热棒的调控效果, 拓展热棒的使用范围, 满足宽幅路基强吸热的使用要求, 依托北麓河与安多2个试验监测场地, 分析了热棒-XPS板路基与热棒-片块石路基地温监测数据。分析结果表明: 热棒工作1年后的有效半径约为2.3m, 此后, 随着热棒工作时间的增加, 热棒影响范围逐渐增大; 在热棒工作的前5年, 地温降幅明显, 周围土体地温降幅都基本维持在0.5℃以上, 之后每年降温较小, 这主要是由于外界环境温度升高, 气温与地温的温差逐渐减小, 热棒工作的动力逐渐衰减引起的; 在热棒工作的8年中, 由于热棒的持续制冷作用, 热棒路基的人为上限基本不变, 而普通路基同时期人为上限最大降低约为80cm; 热棒-XPS板路基从6月份开始, XPS板上下温差不断增大, 最大温差约为17℃, 有效阻隔了暖季大量热量向板下传递; 热棒-片块石路基通过2年的调控作用, 地温最大降幅为0.51℃。
- 路基工程 /
- 多年冻土区 /
- 热棒路基 /
- 应用效果
Abstract: In order to investigate the applicable effect of thermosyphon in permafrost regions along Qinghai-Tibet Highway, 8years'observational ground temperature data were collected from Chuma'er River test site, and the effective radius of thermosyphon was evaluated by taking the horizontal temperature gradient as the index. Additionally, to enhance the temperature-adjusted effect of thermosyphon, extend its application scope and meet the using demand of strong heat absorption of widened subgrade, the observational ground temperature data of the subgrade with XPS insulation board and thermosyphons and the subgrade with rock-crushed interlayer and thermosyphons at Beilu River and Anduo test sites were analyzed. Analysis result shows that the effective radius of thermosyphon after 1year's operation is about 2.3 m, and the influencing range gradually increases with the increase of operational time. Within the first 5 years of thermosyphon operation, the ground temperature obviously decreases, the ground temperature's decreasement around the thermosyphon is over 0.5 ℃, and then, the ground temperature slowlydecreases, which results from the decrease of ground-air temperature difference because of the increase of air temperature and the gradual decay of work motivation of thermosyphon. During8 years of thermosyphon operation, the artificial permafrost tables of thermosyphon subgrades are almost unchangeable because of thermosyphons'continuing refrigeration, while the maximum decrease of contemporaneous artificial permafrost table of common subgrade is about 80 cm. Since June for the subgrade with XPS insulation board and thermosyphons, the temperature difference between top and bottom of XPS insulation board gradually increases, and the maximum value is17 ℃, which effectively mitigates the downward transfer of heat in warm seasons. In 2years'adjustment of subgrade with crushed-rock interlayer and thermosyphons, the maximum decrease of ground temperature is 0.51 ℃.
- subgrade engineering /
- permafrost region /
- thermosyphon subgrade /
- applicable effect

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图 1 热棒路基

Figure 1. Thermosyphon subgrade

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图 2 测温孔布设

Figure 2. Layout of observational boreholes

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图 3 2月份地温曲线

Figure 3. Ground temperature curve in February

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图 4 地温对比

Figure 4. Comparison of ground temperatures

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图 5 水平方向的地温曲线

Figure 5. Horizontal ground temperature curves

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图 6 平均的水平地温曲线

Figure 6. Average horizontal ground temperature curves

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图 7 观测孔地温曲线

Figure 7. Ground temperature curves at observational boreholes

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图 8 左路肩地温对比

Figure 8. Comparison of ground temperatures at left shoulders

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图 9 路基中心线地温对比

Figure 9. Comparison of ground temperatures at center lines of subgrades

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图 10 直插热棒-XPS板复合路基

Figure 10. Combined subgrade with XPS insulation board and inserted thermosyphons

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图 11 发卡热棒-XPS板复合路基

Figure 11. Combined subgrade with XPS insulation board and hairpin thermosyphons

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图 12 一月上旬路中孔地温对比

Figure 12. Comparison of ground temperatures at mid-subgrade boreholes in early January

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图 13 XPS板上下温差曲线

Figure 13. Curves of temperature difference between top and bottom of XPS insulation board

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图 14 发卡热棒路基地温变化过程

Figure 14. Changing processes of ground temperatures of hairpin thermosyphon subgrade

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图 15 热棒-片块石复合路基

Figure 15. Combined subgrade with crushed rocks and thermosyphons

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图 16 路中孔地温对比

Figure 16. Comparison of ground temperatures for borehole at subgrade center

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