沥青路面典型裂缝湿度场数值模拟

doi:10.13229/j.cnki.jdxbgxb20210246

Abstract

Abstract:

In order to clarify the humidity status of the typical cracks in the asphalt pavement during the initiation and development， the humidity field simulation results of the top-down cracks and reflection cracks of the asphalt pavement was carried out， and the variation law of depth and water vapor concentration at top-down cracks and reflection cracks was clarified. The results show that the double sine function model established can better describe the change of relative humidity of atmosphere. The moisture concentration at the top-down cracks is lower than that of the normal pavement， and the moisture concentration at the reflection cracks is higher than that on the normal pavement. This result can be used as a theoretical basis for the research on the initiation and development of cracks under actual humidity and the rational evaluation of the service performance of asphalt pavements.

Key words: road engineering, asphalt pavement, humidity field, top-down cracks, reflection cracks, water vapor concentration

CLC Number:

U416.217

Xiao-he YU,Rong LUO,Zi-yao LIU,Ting-ting HUANG,Yu SHU. Numerical simulation of humidity field of typical cracks in asphalt pavement[J].Journal of Jilin University(Engineering and Technology Edition), 2022, 52(10): 2343-2351.

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t/时刻	相对湿度/%	t/时刻	相对湿度/%
平均值	83.0
0∶00	92.4	12∶00	63.8
1∶00	93.6	13∶00	61.0
2∶00	95.0	14∶00	59.2
3∶00	98.5	15∶00	63.6
4∶00	99.1	16∶00	69.7
5∶00	98.3	17∶00	77.0
6∶00	95.9	18∶00	81.9
7∶00	92.3	19∶00	87.3
8∶00	84.9	20∶00	88.8
9∶00	76.0	21∶00	90.2
10∶00	71.4	22∶00	91.4
11∶00	66.9	23∶00	92.6

t/时刻	温度 /℃	相对湿度/%	绝对湿度 /（g·m^-3）	水气浓度 /（g·mol^-1）
0∶00	29.6	92.4	27.40	1.5222
1∶00	28.6	93.6	26.29	1.4606
2∶00	28.1	95	25.96	1.4422
3∶00	27.8	98.5	26.48	1.4711
4∶00	27.4	99.1	26.06	1.4478
5∶00	27.6	98.3	26.13	1.4517
6∶00	28.7	95.9	27.08	1.5044
7∶00	30.2	92.3	28.28	1.5711
8∶00	31.2	84.9	27.45	1.5250
9∶00	32.0	76	25.64	1.4244
10∶00	32.9	71.4	25.27	1.4039
11∶00	33.7	66.9	24.69	1.3717
12∶00	34.2	63.8	24.18	1.3433
13∶00	35.0	61	24.10	1.3389
14∶00	35.5	59.2	24.00	1.3333
15∶00	35.5	63.6	25.79	1.4328
16∶00	35.0	69.7	27.54	1.5300
17∶00	34.2	77	29.18	1.6211
18∶00	33.7	81.9	30.23	1.6794
19∶00	33.4	87.3	31.72	1.7622
20∶00	32.8	88.8	31.26	1.7367
21∶00	32.3	90.2	30.92	1.7178
22∶00	31.4	91.4	29.87	1.6594
23∶00	30.5	92.6	28.83	1.6017

结构层	结构类型	厚度/cm	4∶00		14∶00
结构层	结构类型	厚度/cm	温度/℃	扩散系数D/（mm²·s^-1）	温度/℃	扩散系数D/（mm²·s^-1）
沥青路面	SMA?13	4	26.715	0.7721	51.099	2.6387
	AC?20C	6	24.618	0.7536	41.551	1.7692
	AC?25C	8	22.640	0.9314	33.701	1.6265
基层	5%水稳层	20	20.984	0.6638	26.286	0.8671
基层	3%水稳层	20	20.155	0.6366	22.403	0.7130

病害类型	t/时刻	顶部温度/℃	底部温度/℃	平均温度/℃	扩散系数 D/（mm²·s^-1）
表面裂缝	4：00	27.781	27.760	27.771	29.8071
表面裂缝	14：00	57.089	56.993	57.041	34.2601
反射裂缝	4：00	27.760	20.035	23.898	29.2335
反射裂缝	14：00	56.993	21.642	39.318	31.5391

t/时刻	深度/cm	正常道路	表面裂缝	反射裂缝
4∶00	0	0.4825	0.4825	0.4825
	4	0.5139	0.5038	0.5139
	10	0.5555	0.5388	0.5732
	14	0.5835	0.5514	0.6169
	18	0.6111	0.5679	0.6601
	23	0.6489	0.6014	0.6975
	28	0.6896	0.6564	0.7182
	33	0.7378	0.7181	0.7456
	38	0.7780	0.7780	0.7810
	58	0.9600	0.9600	0.9600
14∶00	0	0.4824	0.4824	0.4824
	4	0.5131	0.5054	0.5199
	10	0.5556	0.5344	0.5740
	14	0.5835	0.5523	0.6182
	18	0.6072	0.5685	0.6634
	23	0.6489	0.5988	0.7015
	28	0.6896	0.6503	0.7352
	33	0.7345	0.7128	0.7612
	38	0.7823	0.7823	0.7937
	58	0.9600	0.9600	0.9600

Numerical simulation of humidity field of typical cracks in asphalt pavement

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