| 路面类型对多年冻土区片块石路基热状态的影响 |
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| 引用本文： | 王青志,房建宏,晁刚,薛兆锋.路面类型对多年冻土区片块石路基热状态的影响[J].冰川冻土,2019,41(5):1087-1097. |
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| 作者姓名： | 王青志 房建宏 晁刚 薛兆锋 |
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| 作者单位： | 1. 青海省交通科学研究院, 青海 西宁 810016;2. 多年冻土区公路建设与养护技术交通行业重点实验室青海研究观测基地, 青海 西宁 810016 |
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| 基金项目： | 国家自然科学基金（41801046）；青海省自然科学基金（2018-ZJ-959Q；2018-ZJ-955Q）；青海省交通科技项目（2019-06）资助 |
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| 摘 要： | 为了研究不同路面类型对高温多年冻土区路基的热稳定性的影响，基于温度监测数据，针对沥青混凝土路面和水泥混凝土路面下片块石路基温度、热流密度、热收支变化、冻融循环过程及冻土上限变化进行了详细的分析。发现沥青混凝土路面和水泥混凝土路面都对片块石路基的温度有较大的影响，但沥青混凝土路面影响程度和深度远比水泥混凝土路面大。片块石路基中心热收支量呈上升趋势，沥青混凝土路面下其上升速率大于水泥混凝土路面，且路基阳坡热收支量大于阴坡。无论路面材料为沥青混凝土路面还是水泥混凝土路面，片块石路基阴阳坡路肩冻土仍处于不断退化阶段，而阳坡冻土上限下降速率明显大于阴坡。与普通路基相比，片块石层的存在能大幅度抬升或减缓路基冻土上限下降，且浅色水泥混凝土路面更有利于路基的热稳定性。
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| 关 键 词： | 多年冻土 沥青混凝土路面 水泥混凝土路面 片块石路基 热状态 |
| 收稿时间： | 2019-05-14 |
| 修稿时间： | 2019-07-15 |
Influence of pavement type on thermal state of block-stone subgrade in permafrost region |
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| WANG Qingzhi,FANG Jianhong,CHAO Gang,XUE Zhaofeng.Influence of pavement type on thermal state of block-stone subgrade in permafrost region[J].Journal of Glaciology and Geocryology,2019,41(5):1087-1097. |
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| Authors: | WANG Qingzhi FANG Jianhong CHAO Gang XUE Zhaofeng |
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| Institution: | 1. Qinghai Research Institute of Transportation, Xining 810016, China;2. Qinghai Research and Observation Base, Key Laboratory of Highway Construction & Maintenance Technology in Permafrost Region, Ministry of Transport, Xining 810016, China |
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| Abstract: | In order to study the thermal stability of subgrade with different pavement types in warm-temperature permafrost region, this paper analyses the changes of temperature, heat flux, heat budget, freeze-thaw cycles and permafrost table variation of block-stone subgrade with asphalt concrete pavement and cement concrete pavement, based on the temperature data. It is found that both asphalt concrete pavement and cement concrete pavement have great influence on the temperature of block-stone subgrade, but the influence degree and depth of asphalt concrete pavement are much greater than that of cement concrete pavement. The central heat budget of block-stone subgrade on the rising trend, while the rising rate with cement concrete pavement is greater than that with asphalt concrete pavement. And the heat budget on the sunny slope of subgrade is larger than that on the shady slope. Whether the pavement material is asphalt concrete pavement or cement concrete pavement, there is no obvious melting interlayer between the left and right shoulders of subgrade. However, the permafrost is still deteriorating, and the permafrost table of the sunny slope is obviously faster than that on the shady slope. Compared with ordinary roadbed, the existence of block-stone layer can greatly raise or slow down the declining of permafrost table, and light-colored cement concrete pavement is more conducive to the thermal stability of subgrade. |
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| Keywords: | permafrost asphalt concrete pavement cement concrete pavement block-stone subgrade thermal state |
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