通过分析荒漠地区恶劣自然环境下的重荷载交通沥青路面使用状况,采用有限元分析,提出了采用路面性能指数PCI、路表面弯沉与路面车辙作为路面结构的设计指标;得出了荒漠地区耐久性沥青路面结构受力分布.结果表明:不同轴载作用下路表最大竖向变形与轴载近似成线性关系,随着轴载的增大,最大竖向变形逐渐增大;路表最大拉应力以轮轴线呈现对称分布;路面结构层内的剪应力随着深度增加而增大,在距路表5 cm处剪应力达到峰值.研究成果可为荒漠地区耐久性沥青路面选材与结构设计提供科学的理论支撑与技术指导.
In this paper,pavement performance index PCI,road surface deflection and pavement rutting are proposed as the design indexes of pavement structure by analyzing the desert region harsh natural environment under heavy load traffic asphalt pavement condition and using finite element analysis.We obtained the durability of the desert region asphalt pavement structure stress distribution.The results showed that different wheel load on road surface and the maximum vertical deformation has an approximate linear relationship.Along with increase of the axial load,the maximum vertical deformation gradually increases.The maximum tensile stress of the road surface is symmetrical distributed with the wheel axis.The shear stress in the pavement structure increases with the increase of depth,and the shear stress recches peak value at 5 cm away from road sorface.The research results can provide theoretical support and technical guidance for the selection and structural design of the asphalt pavement in the desert region.
[1] 毕玉峰,孙立军.沥青混合料抗剪试验方法研究[J].同济大学学报(自然科学版),2005,33(8):1036-1040.DOI:10.3321/j.issn:0253-374X.2005.08.009. BI Y F,SUN L J.Research on shear test method of asphalt mixture[J].Journal of Tongji University,2005,33(8):1036-1040.DOI:10.3321/j.issn:0253-374X.2005.08.009.
[2] 彭勇,孙立军,王元清,等.沥青混合料抗剪强度的影响因素.东南大学学报,2007,37(2):330-333.DOI:10.3321/j.issn:1001-0505.2007.02.029. PENG Y,SUN L J,WANG Y Q,et al.Influence factors of shear strength of asphalt mixture[J].Journal of Southeast University,2007,37(2):330-333.DOI:10.3321/j.issn:1001-0505.2007.02.029.
[3] 苏凯,孙立军,王永新,等.行车荷载及路面结构对车辙影响的有限元分析[J].同济大学学报(自然科学版),2007,35(2):187-192.DOI:10.3321/j.issn:0253-374X.2007.02.009. SU K,SUN L J,WANG Y X.Mechanics analysis of loads and pavement structure type to asphalt pavement rutting by 3d finite element method[J].Journal of Tongji University,2007,35(2):187-192.DOI:10.3321/j.issn:0253-374X.2007.02.009.
[4] 李峰,孙立军.基层模量对沥青路面力学性能的影响分析[J].公路交通科技,2006,23(10):41-43.DOI:10.3969/j.issn.1002-0268.2006.10.010. LI F,SUN L J.Analysis of the influence of base course modulus on the mechanics performance of asphalt pavement[J].Journal of Highway and Transportation Research and Development,2006,23(10):41-43.DOI:10.3969/j.issn.1002-0268.2006.10.010.
[5] 李峰,孙立军.沥青路面Top-Down开裂成因的有限元分析[J].公路交通科技,2006,23(6):1-4.DOI:10.3969/j.issn.1002-0268.2006.06.001. LI F,SUN L J.Finite element analysis of Top-Down cracking in asphalt pavement[J].Journal of Highway and Transportation Research and Development,2006,23(6):1-4.DOI:10.3969/j.issn.1002-0268.2006.06.001.
[6] 胡春华,孙立军.沥青路面弯沉修正系数研究[J].公路交通科技,2005,22(9):66-69.DOI:10.3969/j.issn.1002-0268.2005.09.017. HU C H,SUN L J.Study on correction coefficient of asphalt pavement deflection[J].Journal of Highway and Transportation Research and Development,2005,22(9):66-69.DOI:10.3969/j.issn.1002-0268.2005.09.017.
[7] 胡小弟,孙立军.轻型货车轮胎接地压力分布实测[J].公路交通科技,2005,22(8):1-7.DOI:10.3969/j.issn.1002-0268.2005.08.001. HU X D,SUN L J.Measuring tire contact pressure distribution of light vehicle[J].Journal of Highway and Transportation Research and Development,2005,22(8):1-7.DOI:10.3969/j.issn.1002-0268.2005.08.001.
[8] 孙立军,刘黎萍.沥青路面结构行为方程中材料影响系数的确定方法[J].公路交通科技,2006,23(12):6-9.DOI:10.3969/j.issn.1002-0268.2006.12.002. SUN L J,LIU L P.Determination of material influence coefficient in asphalt pavement structural behavior equation[J].Journal of Highway and Transportation Research and Development,2006,23(12):6-9.DOI:10.3969/j.issn.1002-0268.2006.12.002.
[9] 杨三强,刘涛,马淑红,等.干旱荒漠区路面覆盖效应评价指标与评价模型研究[J].干旱区资源与环境,2013,27(5):76-83. YANG S Q,LIU T,MA S H,et al.The evaluation index and evaluation model of pavement coverage for arid desert area[J].Journal of Arid Land Resources and Environment,2013,27(5):76-83.
