【作者】 王朝辉；

【导师】 王选仓；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2008， 博士

【摘要】 目前,国内很多沥青路面正处于维修、待修状态,公路设计、施工及科研的重点已逐渐从新设计和新建转移到旧路网的养护和维修。项目重点的转变使得沥青路面的加铺技术研究成为必要。世界各国对沥青路面评价、处治与加铺结构进行了很多研究,也取得了一些较为可喜的成果,但在某些方面研究还不够深入,不够系统。本文依托国家西部交通建设科技项目“沥青路面加铺层设计和施工技术研究”(项目号:2005 318 812 13)的资助,在广泛收集并分析国内外原有沥青路面加铺沥青层有关资料的基础上,结合我国加铺层结构的现有状况,对用沥青加铺层改造旧沥青路面的方法和理论作进一步的研究,力图提出符合国情、切实可行的沥青路面加铺技术。本文主要对以下几个方面的内容进行了研究:(1)针对现有综合评价方法的不足,首次建立了基于区间数逼近法的路面使用性能综合评价模型;结合工程实际要求,考虑道路属性变异,建立了基于累积差分法的路段均匀划分方法。(2)针对沥青路面铣刨厚度较难控制的问题,通过理论分析铣刨前后弯沉及铣刨前弯沉与铣刨后旧路当量回弹模量的变化规律,首次确定了基于弯沉控制的沥青路面铣刨设计准则,为铣刨厚度的确定及加铺层的设计提供了依据;同时,对层间粘层、透层、下封层、防水层等材料进行了深入研究,提出了层间处理技术。(3)对国内30余条高等级公路典型沥青混凝土路面沥青加铺层结构进行了系统调查,建立了旧沥青混凝土路面沥青加铺层计算结构与有限元计算模型,全面分析了荷载作用下及温度作用下典型沥青加铺层结构内力变化规律,并采用正交设计方法,对加铺层的耦合应力进行了数值分析;同时,建立了层间计算模型,对层间抗压、抗剪及层间温度场状况进行全面分析,确定了层间工作状态。(4)针对夹层设计比较模糊的情况,通过全面分析夹层设置位置对加铺层结构应力应变的影响,首次从夹层提高沥青加铺层结构抗开裂能力、延长疲劳寿命及提高抗剪切性能三个不同功能考虑,确定了沥青加铺层结构夹层的合理位置。(5)在室内理想条件下,采用层间剪切仪、层间拉拔仪、马歇尔多功能强度试验机及车辙轮碾仪进行了不同层位格栅的沥青混合料及与加铺层结构相关的对比试验,并采用合理的方法对试验结果进行了评价;同时,采用普通车辙仪进行加铺层结构疲劳模拟对比试验,系统地对不同加铺层厚度的不同格栅设置层位及不同旧路锯缝深度的加铺层结构进行了研究。(6)提出了基于剩余寿命的加铺层结构设计方法,完善了旧沥青混凝土路面加铺层结构设计指标,确定了竖向剪切及层间剪切疲劳轴载换算系数;同时,提出了加铺层典型结构,建立了基于DEA的加铺层结构优化模型,弥补了以往优化方法的不足。更多还原

【Abstract】 Nowadays, many domestic asphalt pavements are in the maintenance or wanting for maintenance. Highway design, construction and scientific research which focused on the new design and new road are transferring to the maintenance of the old road network. The transformation made the technology of asphalt overlay necessary. The technology has been studied by the expert all over the world, and some encouraging results have been obtained. However, in some aspects the researches are not substantially in-depth or systematical. With the financial aids of the national western transportation construction project which is called“the design of asphalt pavement overlay and construction technology”(item No.: 200531881213), based on the widely collecting and analyzing the relative information of asphalt overlay and combining with the specific circumstances of our existing overlay structure, further research of the methods and theories of asphalt overlay is done, in order to propose the feasible technology of asphalt overlay in accordance with the current national condition.This dissertation has mainly researched six aspects as follows: (1) Aiming at the inadequacies of existing comprehensive evaluation method, comprehensive evaluation of pavement performance based on the interval of approximation method is established for the first time. Considering the engineering requirements and the variation of roadway attribute, section of uniform disturbance method based on the cumulative difference is established. (2) In view of the question that the thickness of milling is difficult to control, the change rule of the deflection before and after milling have been analyzed, and the change law of the deflection before milling and the equivalent snapping back module after milling have been researched. The design criterion of the asphalt pavement based on the deflection control had been determined for the first time, which provides the basis for the determination of milling thickness and overlay design. The materials of tack coat, seal coat, seal coat, waterproof layer and so on have been studied, and the technology of interlaminar treatment has been proposed.(3) After systematically surveying of the typical asphalt overlay structure on 30 domestic highway asphalt pavements, the asphalt overlay structure and finite element calculation model has been established. The change rule of the asphalt overlay internal force under the axle and temperature load has been systematically studied, and the coupling stress of overlay is numerically analyzed by orthogonal design methods. Finally, the compression, shear stress and the temperature field between layers have been comprehensively analyzed, and the interlaminar condition has been established. (4) In view of the chaotic situation of the position of interlayer, through comprehensive analysis of the effect of position of interlayer on the overlay stress and strain, the optimum position of interlayer has been proposed from the three aspects of the anti-cracking ability, extending the fatigue life and improving shear cutting performance for the first time.(5) In the indoor ideal conditions, the relevant comparative tests of different grid interlayer of asphalt mixture and overlay structure have been done by using interlay shearing device, drawing machine, Marshall multi-functional strength device and rutting machine, and then the test results have been evaluated by a rational approach. Meanwhile, the simulated test of the overlay fatigue life has been done by using ordinary rutting machine, and the different overlay thickness of different grade interlayer and different sawing depth of overlay structure have been studied by the fatigue test.(6)The design method of overlay structure based on the residual life has been proposed. The design index of the asphalt overlay structure has been improved, and the fatigue axel load conversion factor of vertical shear and the interlaminar shear has been established. Meanwhile, optimization method of overlay structure based on DEA method has been established, which compensates the past deficiencies of optimization method.更多还原