设ISAC复合式路面力学响应与结构设计研究
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摘要
在水泥混凝土板上加铺沥青层修筑的CC-AC复合式路面可以克服水泥混凝土路面和沥青路面的缺点,集中两种路面结构的优点,刚柔相济,大大提高路面的使用性能,从而延长其寿命。但由于水泥混凝土板自身特点及层间结合等问题,决定了在使用CC-AC复合式路面时必须有效解决反射裂缝的问题。基于此,论文对设置复合式应力吸收夹层(Interlayer Stress Absorbing Composite,简称ISAC)的复合式路面结构的力学响应及结构设计方法进行系统研究。
论文基于断裂力学理论,重点针对偏载和低温两种不利情况,通过计算设与不设ISAC复合式路面结构最不利位置的应力强度因子,分析了ISAC的防裂优势。采用三维有限元软件,分析了偏载及低温作用下复合式路面结构中ISAC的力学响应,提出ISAC上层设置高模量土工材料,中间设置低模量硫化橡胶沥青,下层设置低模量土工材料,可充分发挥ISAC的防裂与防渗等作用,并推荐出ISAC各结构层的模量取值。分别针对偏载与低温两种不利情况,对比分析了设与不设ISAC复合式路面结构的力学响应,进一步体现出ISAC的防裂优势,并系统分析了沥青加铺层厚度与模量、水泥混凝土板厚度与模量、基础模量、轴载、大气温度等因素变化对设置ISAC复合式路面结构受力的影响规律,并得出上述参数变化时沥青层偏载应力及低温应力相对于标准模型的修正系数。在此基础上,提出了设置ISAC复合式路面结构的设计指标、设计标准与设计方法,绘制了设计流程图,并推荐出合理的路面结构。
The composite pavement which is the structure of asphalt overlay pavement on the ce-ment concrete board can overcome the shortcomings of cement pavement and asphalt pave-ment, and include the advantages of both. The composite pavement can greatly improves the road performance because it has the rational stiffness, futhermore, it also can extends pave-ment's life. As the problems of cement concrete slab and the interlayers bonding, it must ef-fectively solve the problem of the reflective crackings before using the CC-AC composite pavement.Therefore, the paper studied the the compound road which set ISAC (Interlayer Stress Absorbing Composite, called ISAC) and discussed systematically the road's mechani-cal responses and the structural design method.
This paper focused on unfavorable conditions of the partial load and low-temperature based on fracture mechanics theory, and analysed the ISAC advantages of preventing reflec-tive crack by calculating the stress intensity factor of the composite pavement which set ISAC or not at the most unfavorable position. It analysed mechanical responses of the com-posite pavement under the partial load and low temperature based on the Three-dimensional finite element models. The upper layer of ISAC is high modulus geotextile material, the mid-dle layer is the low modulus of vulcanized rubber asphalt, and the lower layer is the low modulus geotextile material.So it can take advantage of ISAC to delay the reflective cracks. This paper recommend the ISAC modulus of each layer.It compared the mechanical responses of the composite pavement which set ISAC or not under the partial load and low temperature condition, and further reflected the anti-cracked advantages of ISAC. It also analysed the in-fluences of factors to the mechanics of the composite pavement which include the overlay modulus and thickness,the slab modulus and thickness,the foundation modulus,the axle load,the air temperature.It analyzed the correction of partial stress and low temperature stress campared with the standard model when the factors changed. In the end, the paper proposed the structure design specifications, design standards and design methods of the composite pavement which set the ISAC, and also drawed the design flow, and recommended a reason-able pavement structure.
论文基于断裂力学理论,重点针对偏载和低温两种不利情况,通过计算设与不设ISAC复合式路面结构最不利位置的应力强度因子,分析了ISAC的防裂优势。采用三维有限元软件,分析了偏载及低温作用下复合式路面结构中ISAC的力学响应,提出ISAC上层设置高模量土工材料,中间设置低模量硫化橡胶沥青,下层设置低模量土工材料,可充分发挥ISAC的防裂与防渗等作用,并推荐出ISAC各结构层的模量取值。分别针对偏载与低温两种不利情况,对比分析了设与不设ISAC复合式路面结构的力学响应,进一步体现出ISAC的防裂优势,并系统分析了沥青加铺层厚度与模量、水泥混凝土板厚度与模量、基础模量、轴载、大气温度等因素变化对设置ISAC复合式路面结构受力的影响规律,并得出上述参数变化时沥青层偏载应力及低温应力相对于标准模型的修正系数。在此基础上,提出了设置ISAC复合式路面结构的设计指标、设计标准与设计方法,绘制了设计流程图,并推荐出合理的路面结构。
The composite pavement which is the structure of asphalt overlay pavement on the ce-ment concrete board can overcome the shortcomings of cement pavement and asphalt pave-ment, and include the advantages of both. The composite pavement can greatly improves the road performance because it has the rational stiffness, futhermore, it also can extends pave-ment's life. As the problems of cement concrete slab and the interlayers bonding, it must ef-fectively solve the problem of the reflective crackings before using the CC-AC composite pavement.Therefore, the paper studied the the compound road which set ISAC (Interlayer Stress Absorbing Composite, called ISAC) and discussed systematically the road's mechani-cal responses and the structural design method.
This paper focused on unfavorable conditions of the partial load and low-temperature based on fracture mechanics theory, and analysed the ISAC advantages of preventing reflec-tive crack by calculating the stress intensity factor of the composite pavement which set ISAC or not at the most unfavorable position. It analysed mechanical responses of the com-posite pavement under the partial load and low temperature based on the Three-dimensional finite element models. The upper layer of ISAC is high modulus geotextile material, the mid-dle layer is the low modulus of vulcanized rubber asphalt, and the lower layer is the low modulus geotextile material.So it can take advantage of ISAC to delay the reflective cracks. This paper recommend the ISAC modulus of each layer.It compared the mechanical responses of the composite pavement which set ISAC or not under the partial load and low temperature condition, and further reflected the anti-cracked advantages of ISAC. It also analysed the in-fluences of factors to the mechanics of the composite pavement which include the overlay modulus and thickness,the slab modulus and thickness,the foundation modulus,the axle load,the air temperature.It analyzed the correction of partial stress and low temperature stress campared with the standard model when the factors changed. In the end, the paper proposed the structure design specifications, design standards and design methods of the composite pavement which set the ISAC, and also drawed the design flow, and recommended a reason-able pavement structure.
引文
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[3]P.C.Paris and F.Erdogan. A Critical Analysis of Crack Propagation Laws. Transactions of the ASME, Journal of Basic Engineering Series D, No.3,1963.
[4]Yamaday, etc. Reconsiderations on Singularity or Crack Tip Elements[J]. Int. J. Numerical Methods in Engineering,1979, (14)
[5]Majidzadeh, K; Abdulshafi, A.; lives, G. J.; McLaughlin, Aston. Mechanistic Model for thermally Induced Reflection Cracking of Portland Cement Concrete Pavement with Rei-forced Asphalt Concrete Overlay. Transportation Research Record,1987, p 83-93
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[11]李祖仲.应力吸收层沥青混合料组成设计及抗裂性能研究[D].长安大学,2009
[12]周燕.SAMPAVE抗裂结构层材料及其路用性能研究[D].长安大学,2007
[13]廖卫东,陈拴发、李祖宗.改性沥青混合料应力吸收层材料特性与结构行为[M].科学出版社,2010
[14]曾艺,李成现等.水泥砼沥青加罩时设置SAMI的力学响应分析[J].中南公路工程,2005
[15]林海英,刘勇等.橡胶沥青SAMI应力吸收层的性能试验研究[J].中外公路,2009
[16]Mukhtar M T, Dempsey B J. Interlayer stress absorbing composite(ISAC) for mitigating reflection cracking in asphalt concrete overlays [D]. University of Illinois at Ur- bana-Champaign,1994.
[17]邓学钧,黄仰贤等.具有接缝的混凝土路面简化分析法[J].东南大学学报(自然科学版),1984
[18]张起森.半刚性基层沥青面层断裂应力分析及反射裂缝研究综述[J].中外公路,1987
[19]李淑明.旧PCC路面上AC加铺层设计方法的研究[D].同济大学,2002
[20]杨斌.旧水泥混凝土路面沥青加铺层结构研究[D].长安大学,2005
[21]程毅.设置应力吸收层的水泥混凝土路面沥青加铺层结构研究[D].长安大学,2006
[22]杨太钦.PCC-AC复合式路面典型结构研究[D].广西大学,2008
[23]ANSYS用户手册.ANSYS.Inc.2006.
[24]张登良.沥青路面工程手册[M].人民交通出版社,2004
[25]范天佑.断裂理论基础[M].科学出版社,2003
[26]周富杰,胡圣.反射裂缝产生和发展的机理[J].国外公路,1997
[27]杨涛.半刚性基层沥青路面反射裂缝的产生机理及其防治[D].武汉理工大学,2005
[28]周富杰,谢晋光,孙立军.复合沥青路面临界荷位分析[C].上海市公路协会第四届年会学术论文集,1999
[29]孙兆刚.干旱寒冷地区沥青路面温度力学响应[D].长安大学,2010
[30]谈至明.路面温度张开型反射裂缝产生机理的分析[J].同济大学学报,1998
[31]曹东伟,胡长顺.有防裂夹层结构的旧水泥混凝土路面沥青加铺层力学分析[J].中国公路学报,1999.5
[32]沈金安.沥青及沥青混合料路用性能[M].人民交通出版社,2001
[33]Majidzadeh, K.C.,Buranarom.C.&Karakouzian,M..Application of Fracture Mechanics for mproved Design of Bituminous concrete.Report No.FHWA-RD-76-91. Vol.1,June.1976
[34]彭翀.贫混凝土基层沥青路面抗反射裂缝结构研究[D].长安大学大学,2006
[35]解德,钱勤,李长安.断裂力学中的数值计算方法及工程应用[M].科学出版社,2009
[36]祝瑛,蒋永莉.工程力学：静力学与材料力学[M].清华大学出版社,2010
[37]E.M.Kauffman.the Application of Fracture Mechanics Concept to Predict Cracking of Flexible Pavements.Ph.D.dissertation,Ohio State Univ.,1973
[38]Majidzadeh, K.C.,Buranarom.C.&Karakouzian,M..Application of Fracture Mechanics for Improved Design of Bituminous concrete.Report No.FHWA-RD-76-91. Vol.1,June.1976
[39]匡震邦、马法尚.裂纹端部场[M].西安：西安交通大学出版社,2002.1
[40]徐慧,伍晓赞等.复合裂纹应力强度因子有限元分析[J].中南大学学报,2007
[41]黄晓明,张玉宏等.水泥混凝土路面碎石化层应力强度因子有限元分析[J].公路交通科技,2006
[42]祝效华,余志祥等.ANSYS高级工程有限元分析[M].北京：电子工业出版社,2004
[43]博弈创作工作室.APDL参数化在有限元分析技术及其应用实例[M].北京：水利水电出版社,2004
[44]张国智胡仁喜等.ANSYS10.0热力学有限元分析[M].北京：机械工业出版社,2007
[45]党沙沙等.ANSYS多物理场耦合有限元分析[M].北京：机械工业出版社,2010(JTJ/T019-98).北京：人民交通出版社,1998
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[47]王新敏.ANSYS工程结构数值分析[M].人民交通出版社,2007
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