保温板在内蒙多年冻土区道路工程中的应用

张宝龙; 范文

doi:10.12090/j.issn.1006-6616.2018.24.05.072

保温板在内蒙多年冻土区道路工程中的应用

doi: 10.12090/j.issn.1006-6616.2018.24.05.072

张宝龙^{1, 2,},
范文¹

1.
长安大学地测学院, 陕西西安 710064
2.
内蒙古交通设计研究院有限责任公司, 内蒙古呼和浩特 010010

基金项目:

西部交通建设科技项目 200631800006

详细信息

作者简介:
张宝龙(1977-), 男, 博士, 教授级高级工程师, 研究方向为边坡与地基工程。E-mail:40952734@qq.com

中图分类号: U418.5
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- HTML全文浏览量: 112
- PDF下载量: 3
- 被引次数: 0
出版历程
- 收稿日期: 2018-06-01
- 修回日期: 2018-08-13
- 刊出日期: 2018-10-01

APPLICATION OF INSULATION BOARD IN ROAD ENGINEERING IN PERMAFROST REGIONS OF INNER MONGOLIA

ZHANG Baolong^{1, 2
,},
FAN Wen¹

1.
College of Geology Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China
2.
Inner Mongolia Transportation Design and Research Institute, Huhhot 010010, Inner Mongolia, China

摘要

摘要: 根据博—牙高速沿线气象工程地质资料、观测资料、设计资料，借助有限元软件构建了路基温度场数值计算模型，着重对不同路基填筑高度条件下XPS板对温度场的影响进行了研究。研究发现：路基填筑高度的增加和XPS保温板的应用对冻土都起到了积极的保护作用，相同路堤填筑高度下，道路运营到第20年时，XPS保温板路基多年冻土温度比碎石路基降低了约0.19℃；XPS保温板的存在使得冻土上限上移更加明显，相同路基高度下，冻土上限平均抬升量约为1.23 m，在规范规定年限内，XPS保温板路基的冻土上限均位于换填碎石中；但XPS保温板的存在加剧了阴阳坡效应的发展，综合考虑，在本段落若采用碎石路堤建议路堤高度应保持在3 m以上；若采用XPS保温板路基，建议路堤高度不超过2 m。
- 道路工程 /
- 多年冻土 /
- XPS保温板 /
- 数值模拟 /
- 温度场
Abstract: Based on the meteorological engineering geological data, observation data and design data along the Bo-Ya expressway, a numerical calculation model of the roadbed temperature field was constructed by means of finite element software, and the influence of XPS insulation board on temperature field under different subgrade filling height was studied emphatically. The results show that, the increase of the subgrade height and the application of XPS insulation board both play a positive role in protecting permafrost. With the same embankment filling height, the temperature of permafrost of the subgrade with XPS insulation board reduces by about 0.19℃ than that of the subgrade with crushed rocks when the road runs to its twentieth years. XPS insulation board makes the upper limit of permafrost obviously raised, and the average uplift of the upper limit of permafrost is about 1.23 m under the same subgrade height. The upper limit of permafrost of subgrade with XPS insulation board is located in the replaced crushed rocks during the specified years of the designing code. However; the application of XPS insulation board aggravates the development of sunny-shady slope effect, the subgrade height with crushed rock should be kept above 3 m, and the subgrade height with XPS insulation board should be kept no more than 2 m.
- road engineering /
- permafrost /
- XPS insulation board /
- numerical simulation /
- temperature field

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图 1 K198+000点处地层柱状图

Figure 1. Stratum histogram at K198+000 point

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图 2 路基路面结构

Figure 2. Subgrade and pavement structure

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图 3 不同路基高度情况下温度场分布

Figure 3. Distribution of temperature fields with different subgrade heights

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图 4 不同高度碎石路堤路中温度剖面

Figure 4. Temperature profile for crushed rock subgrade with different heights

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图 5 3 m高XPS碎石路堤路中温度剖面

Figure 5. Temperature profile for 3 m-high crushes rock subgrade with XPS insulation board

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图 6 不同路基高度下多年冻土上限变化过程

Figure 6. The variation process of permafrost upper limit under different subgrade heights

下载: 全尺寸图片幻灯片

表 1 材料热参数

Table 1. Thermal parameters of subgrade and pavement materials

结构层	密度ρ/(kg/m³)	融土比热C_u/(J/(kg·℃))	冻土比热C_f/(J/(kg·℃))	融土导热系数λ_u/(W/(m·℃))	冻土导热系数λ_f/(W/(m·℃))
沥青路面	2358	1680	1680	1.05	1.05
水稳碎石	2277	920	920	1.5	1.5
水稳砂砾	2233	920	920	2.04	2.04
砂垫层	1500	1010	1010	0.58	0.58
路堤碎石	1900	1730	1580	1.06	1.6
换填碎石	1900	1730	1580	1.06	1.6
XPS保温板	45	5346	5346	0.029	0.029
泥炭土	800	3814	2425	0.8	1.55
季冻土	1600	2208	1900	0.77	1.12
冻土	1900	1800	1600	0.93	1.16

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表 2 路基土焓值

Table 2. Enthalpy of subgrade soil

温度/(℃)		-10	-5	-2	-1	-0.5	0	15
泥炭土	w_u/%	3	4.5	7.3	10.7	16.2	50	50
泥炭土	H/(MJ/m³)	19.40	23.41	30.91	31.82	46.53	136.98	182.75
季冻土	w_u/%	2.7	4.18	7.46	11.6	13.8	22	22
季冻土	H/(MJ/m³)	30.40	38.32	55.88	78.03	89.81	133.69	204.35
多年冻土	w_u/%	0.29	0.45	0.78	1.19	1.82	10	10
多年冻土	H/(MJ/m³)	30.4	39.28	45.99	49.93	54.31	101.53	132.46

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表 3 太阳日辐射总量和长波有效辐射量

Table 3. Total daily solar radiation and long wave effective radiation

月份	1	2	3	4	5	6	7	8	9	10	11	12
太阳日总辐射量Q/(MJ/m²·d)	4.17	7.17	13.67	16.67	19.5	20.83	19.5	17.0	10.93	6.67	3.67	2.83
有效辐射F/(MJ/m²·d)	2.67	3.33	4.17	3.00	3.00	3.00	2.83	3.00	2.67	2.67	2.33	1.53

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表 4 坡面系数取值

Table 4. Slope coefficient

月份	北偏西
月份	阳坡	阴坡
1	1.61	0.3
2	1.43	0.39
3	1.24	0.5
4	1.07	0.68
5	0.93	0.78
6	0.9	0.81
7	0.93	0.78
8	1.07	0.68
9	1.24	0.5
10	1.43	0.39
11	1.61	0.3
12	1.72	0.28

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表 5 博克石地区月蒸发量

Table 5. Monthly evaporation in Bokeshi

月份	1	2	3	4	5	6	7	8	9	10	11	12
蒸发量/mm	10.1	22.6	60.0	145.8	246.2	184.7	166.6	130.6	117.4	73.7	24.5	9.3

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表 6 不同高度碎石路堤多年冻土温度

Table 6. Permafrost temperature for crushed rock subgrade with different heights

多年冻土温度/℃	1a	5a	10a	15a	20a
碎石路堤-1 m	-3.05	-1.38	-0.91	-0.71	-0.55
碎石路堤-2 m	-3.07	-1.46	-0.96	-0.78	-0.63
碎石路堤-3 m	-3.11	-1.54	-1.02	-0.84	-0.70
碎石路堤-4 m	-3.13	-1.61	-1.09	-0.89	-0.76

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表 7 不同高度XPS保温板路基多年冻土温度

Table 7. Permafrost temperature for subgrade with XPS insulation board with different heights

多年冻土温度/℃	1a	5a	10a	15a	20a
XPS路堤-1 m	-3.10	-1.61	-1.07	-0.88	-0.73
XPS路堤-2 m	-3.13	-1.69	-1.16	-0.94	-0.81
XPS路堤-3 m	-3.14	-1.76	-1.25	-1.00	-0.87
XPS路堤-4 m	-3.13	-1.82	-1.33	-1.06	-0.93

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