【作者】 王乾；

【导师】 王选仓；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2009， 博士

【摘要】 脱空评价、处治与力学状态研究是处于水泥混凝土路面板底脱空研究核心地位的内容,但是到目前为止,上述方面尚没有进行综合及系统的研究,而且部分研究的内容和深度未能达到工程所要求的程度,在某种程度上制约着水泥混凝土路面板底脱空研究的发展和工程应用。因此,本研究在分析国内外研究现状的基础上,以水泥混凝土路面板底脱空为研究对象,结合烟威高速试验路为依托,内容涉及水泥混凝土路面板底脱空的检测方法、评价标准、力学状态及处治技术等方面。(1)路面板底脱空评价体系与标准研究在对路面板底脱空成因及现有检测判别方法分析的基础上,综合系统地研究同板板中、板边中点、板角动静弯沉差,唧泥高度,路面雷达板底脱空判别方法,以同板动静弯沉差和唧泥高度作为评价指标分别建立旧水泥混凝土路面板底轻度、中度、重度脱空的分级标准,以期能简便、准确、实用的评价旧水泥混凝土路面板底脱空,补充和完善我国相关规范。(2)基于板底脱空的路面板力学行为研究全面研究在荷载和温度作用下不同路面板底脱空位置、面积,路面板厚度,接缝传荷能力,基层厚度等因素对水泥混凝土路面板应力及弯沉的影响；系统分析路面板最大应力及弯沉,总结最大应力及弯沉的变化规律,明确板底脱空路面板的力学行为,计算板底脱空水泥混凝土路面结构的疲劳寿命,为水泥混凝土路面板底脱空判别方法等方面研究提供力学基础。(3)路面板底脱空处治技术与评价标准研究主要对蓝派冲击压实、门刀式打裂压稳、MHB碎石化等旧水泥混凝土路面冲击压稳处治技术及针对板底不同脱空程度的有机类、水泥类、掺砂式自补偿式压浆处治材料进行全面系统的研究,进而推荐适用于不同板底脱空程度的处治效果评价标准,以应用于板底脱空不同处治技术效果评价,为旧水泥混凝土路面板底脱空处治技术和材料设计等研究提供理论基础。(4)板底脱空压浆处治路面板力学行为研究通过对板底脱空旧水泥混凝土路面板力学行为和板底脱空压浆处治技术的研究,进一步研究在荷载作用下不同路面板底压浆位置、面积,浆体模量,路面板厚度,基层厚度等因素对压浆处治路面板应力和弯沉的影响,确定压浆处治路面板的力学状态,得到不同压浆材料的有效处治面积。(5)基于脱空的旧水泥路面沥青加铺层结构力学行为研究系统分析荷载和温度耦合作用下沥青罩面层模量、厚度及旧水泥路面厚度等因素对沥青加铺层应力及弯沉的影响,剖析存在脱空的旧水泥路面加铺薄层沥青罩面复合式结构的力学行为,并以弯沉作为检测指标提出旧水泥路面加铺薄层沥青罩面复合式结构脱空评价标准。为沥青加铺层结构组合、材料设计和效果评价提供理论依据。更多还原

【Abstract】 The study on the detection and treatment technology and mechanical state of voids beneath cement concrete pavement are the key content. However, there still has been no comprehensive and systematic study on them, and the content and degree of some studies can not meet the requirements of engineering. It restricts the development and application of study on voids beneath cement concrete pavement to a certain extent. Hence, based on the study at home and abroad and Yantai-Weihai highway testing part as attaching project, this study analyzes the detection methods, evaluation criteria, mechanical state and treatment technology of voids beneath cement concrete pavement.(1) Analysis of the evaluation system and criteria of voidsBased on the analysis for cause and existing detection methods of voids beneath cement concrete pavement, the detection methods by the dynamic deflection and static deflection difference among the centre point, the midpoint of edge and the corner of the same slab, the pumping height and the road radar are studied synthetically. The evaluation criteria for the mild, moderate and serious degree of voids beneath cement concrete pavement by the indexes of the dynamic deflection and static deflection difference of the same slab and the pumping height are established. The evaluation criteria are expected to detect voids beneath cement concrete pavement in the simple, accurate and practical way, as the supplement and perfection for the related specifications.(2) Analysis of the mechanical behaviors of cement concrete slabs above voidsThe effect of factors such as the position and area of voids, the thickness of slabs, the load-transfer capacity of joints and the thickness of base on the stress and deflection of cement concrete slabs under traffic load and temperature are analyzed comprehensively. The maximum stress and deflection of cement concrete slabs are analyzed systematically, and the variation rule of the maximum stress and deflection value are summarized. The mechanical behaviors of cement concrete slabs above voids are determined, and the fatigue life is calculated, providing the mechanical basis for the detection methods. (3) Analysis of the technology and evaluation criteria for voids treatmentThe impacting and compacting technology such as of Landpac compaction, Guillotine break and MHB rubblization for voids treatment and the self-compensation grouting material of the organic type, the cement type and the sand type for different degree of voids treatment are analyzed systematically. Then the evaluation criteria are recommended to evaluate the effect of different treatment technology on different degree of voids, providing the theoretical basis for the technology and material design of voids treatment.(4) Analysis of the mechanical properties of grouting slabsAccording to the analysis of the mechanical behaviors of cement concrete slabs above voids and the treatment technology of voids grouting, the effect of factors such as the position and area of voids grouting, the modulus of grouting materials, the thickness of slabs and base on the stress and deflection of cement concrete slabs under traffic load are analyzed further. The mechanical condition of grouting slabs and the effective area of grouting material are determined.(5) Analysis of the mechanical behaviors of PCC-AC above voidsThe effect of factors such as the modulus and thickness of AC overlay and thickness of slabs on the stress and deflection of AC overlay under the coupling function of the traffic and temperature load are analyzed systematically, and the mechanical behaviors of PCC-AC above voids are studied. The evaluation criteria for the voids beneath PCC-AC by the indexes of the dynamic deflection and static deflection are recommended, providing the theoretical basis for the structural combination, material design and effect evaluation of AC overlay.更多还原