基于分形理论的沥青路面层间机械摩阻强度行为

doi:10.13229/j.cnki.jdxbgxb20181003

摘要/Abstract

摘要：

为沥青路面层间抗剪切设计及施工提供参考，针对现有沥青路面的结构层组合形式，研究了不同级配结构层组合类型沥青路面层间机械摩阻强度。首先，基于分形理论建立沥青路面层间机械摩阻强度理论模型，并分析了不同级配结构层组合形式的沥青路面机械摩阻强度特性；其次，为验证该理论模型的可靠性，进行了不同级配结构层组合类型的沥青路面剪切试验。结果表明：层间接触表面形态受沥青混合料级配影响较大，其中，级配组合类型为AC-13/AC-16的接触面积最大，然后依次为AC-13/AC-20、AC-16/AC-20；在相同荷载作用下，层间机械摩阻强度受上、下层级配结构层组合类型影响较大，级配结构层组合类型为AC-13/AC-20时，层间机械摩阻强度最大，然后依次为AC-16/AC-20、AC-13/AC-16；在温度为20 ℃时，层间机械摩阻强度理论值与试验值较接近，表明在该条件下沥青路面层间机械摩阻强度理论模型具有一定的可靠性与适用性。

关键词: 沥青路面, 分形理论, 接触面积, 抗剪强度, 机械摩阻强度

Abstract:

In order to provide reference for the anti-shear design and construction of asphalt pavement layer, the mechanical frictional strength between layers of asphalt pavements with different grades of structural layers was studied based on the structural layer combination of existing asphalt pavements in this study. Firstly, the theoretical model of mechanical frictional resistance between asphalt pavement layers is established based on the fractal theory, and the mechanical frictional strength characteristics of asphalt pavement with different grading structural layers combinations are analyzed. Furthermore, the shear tests of asphalt pavement with different grading structural layer combinations were carried out in order to verify the reliability of the theoretical model. The results show that the interlayer surface morphology is greatly affected by the gradation of asphalt mixture. Among them, the gradation combination type AC-13/AC-16 has the largest contact area, followed by AC-13/AC-20 and AC-16/AC-20. The mechanical frictional strength between layers is greatly affected by the combination of upper and lower gradation structure layers under the same load, and the gradation structure layer combination type AC-13/AC-20 has the largest interlayer mechanical friction strength, followed by AC-16/AC-20 and AC-13/AC-16. The theoretical value of the mechanical frictional strength among the interlayers is fitting to the experimental value at the temperature of 20 °C, which indicates that the theoretical model of the mechanical frictional strength among the asphalt pavement interlayers has certain reliability and applicability under this condition.

Key words: asphalt pavement, fractal theory, contact area, shear strength, mechanical friction strength

中图分类号:

U414

毛昱,李萍,念腾飞,林梅,魏西应. 基于分形理论的沥青路面层间机械摩阻强度行为[J]. 吉林大学学报(工学版), 2020, 50(2): 594-605.

Yu MAO,Ping LI,Teng-fei NIAN,Mei LIN,Xi-ying WEI. Mechanical friction intensity behavior of asphalt pavement based on fractal theory[J]. Journal of Jilin University(Engineering and Technology Edition), 2020, 50(2): 594-605.

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r/mm	ln( r/ r_max)	H( r)	ln H( r)
16.000	-	-	-
13.200	0	93.60	4.539
9.500	-0.329	72.80	4.288
4.750	-1.022	54.40	3.996
2.360	-1.722	37.20	3.616
1.180	-2.415	27.70	3.321
0.600	-3.091	18.07	2.894
0.300	-3.784	13.38	2.594
0.150	-4.477	8.80	2.175
0.075	-5.170	6.80	1.917

r/mm	ln( r/ r_max)	H( r)	ln H( r)
16.000	0	93.5	4.538
13.200	-0.192	83.8	4.428
9.500	-0.521	66.5	4.197
4.750	-1.214	47.9	3.869
2.360	-1.914	31.3	3.444
1.180	-2.607	23.4	3.153
0.600	-3.283	17.0	2.833
0.300	-3.977	12.8	2.549
0.150	-4.670	8.7	2.163
0.075	-5.363	5.7	1.740

r/mm	ln( r/ r_max)	H( r)	ln H( r)
26.500	-	-	-
19.000	0	96.0	4.564
16.500	-0.172	85.0	4.443
13.200	-0.364	73.5	4.297
9.500	-0.693	63.0	4.143
4.750	-1.386	42.0	3.738
2.360	-2.086	30.0	3.401
1.180	-2.779	21.0	3.045
0.600	-3.455	14.0	2.639
0.300	-4.148	10.5	2.351
0.150	-4.842	8.0	2.079
0.075	-5.535	6.0	1.792

级配结构层组合类型	剪切试件层间名义接触面积 A_a/m ²	有效接触面积占名义接触面积百分比( A_r/ A_a)/%	剪切试件层间有效接触面积 A_r/m ²
AC-13/AC-20	0.012	70.652	0.008 48
AC-16/AC-20	0.012	63.517	0.007 62
AC-13/AC-16	0.012	74.583	0.008 95

试件类型	上层结构（5 cm）	粘层材料	下层结构（5 cm）
类型1	AC-13	无粘层油	AC-20
类型2	AC-16	无粘层油	AC-20
类型3	AC-13	无粘层油	AC-16
类型4	AC-13	乳化沥青	AC-20
类型5	AC-16	乳化沥青	AC-20
类型6	AC-13	乳化沥青	AC-16
类型7	AC-13	基质沥青	AC-20
类型8	AC-16	基质沥青	AC-20
类型9	AC-13	基质沥青	AC-16
类型10	AC-13	SBS改性沥青	AC-20
类型11	AC-16	SBS改性沥青	AC-20
类型12	AC-13	SBS改性沥青	AC-16