板底脱空层间作用下水泥路面疲劳寿命研究

发布时间：2019-02-24 11:35

【摘要】：层间接触不良是导致水泥混凝土路面破坏的主要原因之一,而板底脱空是水泥混凝土路面最主要的病害之一,两者对水泥混凝土路面使用性能及其疲劳寿命的影响十分显著,故本文以层间接触状态下板底脱空水泥混凝土路面为研究对象,分析层间接触系数与各影响因素耦合作用下板底脱空水泥混凝土路面的力学响应特征及疲劳寿命的发展规律。创新性模拟分析基于层间接触状态板底脱空水泥混凝土路面。通过建立ANSYS有限元模型,在明确层间接触系数范围、不利脱空位置和脱空形状的基础上,全面系统研究基于脱空尺寸、脱空深度、面层厚度/模量和基层厚度/模量各影响因素与层间接触状态耦合作用下,板底脱空水泥混凝土路面的力学行为特征。实现板底脱空水泥混凝土路面层间接触状态实体试验。利用直接铺筑、加铺土工网或塑料膜模拟不同的层间接触状态,检测载荷作用下水泥混凝土面板的微应变,确定板角脱空位置处最不利测点,研究层间接触状态对脱空路面板受力的影响。综合理论模型分析与实体模型试验,验证了理论模型的可靠性。解决基于层间接触状态板底脱空水泥混凝土路面疲劳寿命计算。提出板底脱空修正系数,改进极限状态设计方程,推导板底脱空水泥混凝土路面疲劳寿命计算公式。采用有限元软件模拟分析板底脱空路面温度应力的变化特征,确定层间接触状态下板底脱空水泥混凝土路面的疲劳寿命,针对板底脱空各影响因素,推荐层间接触状态下疲劳寿命的数学计算方法。本研究不仅可以为层间接触状态下板底脱空水泥混凝土路受力分析提供理论基础,而且对水泥混凝土路面层间设计具有一定指导意义,为确定层间接触状态与影响因素耦合作用下脱空水泥混凝土路面疲劳寿命预估提供理论依据。
[Abstract]:Poor contact between layers is one of the main causes of cement concrete pavement damage, and slab bottom void is one of the most important diseases of cement concrete pavement. Both of them have a significant effect on the performance and fatigue life of cement concrete pavement. Therefore, this paper takes the cement concrete pavement with slab bottom void under the condition of interlayer contact as the research object, and analyzes the mechanical response characteristics and fatigue life development law of the slab bottom empty cement concrete pavement under the coupling of interlayer contact coefficient and various influencing factors. Innovative simulation analysis of cement concrete pavement based on interlayer contact state. By establishing ANSYS finite element model, based on defining the range of contact coefficient between layers, unfavorable void position and void shape, a comprehensive and systematic study is carried out on the basis of void size and depth. The mechanical behavior of cement concrete pavement with slab bottom voids is studied under the coupling of the influence factors of the thickness / modulus of the surface layer and the thickness / modulus of the base course and the interlayer contact state. The solid test of contact state of cement concrete pavement is realized. Using direct paving, overlaying geotextile or plastic film to simulate different interlayer contact state, the micro-strain of cement concrete slab under load is detected, and the most unfavorable measuring point is determined where the plate angle is emptied. The influence of interlayer contact state on the stress of the slab is studied. The reliability of the theoretical model is verified by comprehensive theoretical model analysis and solid model test. To solve the fatigue life calculation of cement concrete pavement based on interlayer contact state. In this paper, the correction coefficient of slab bottom void is put forward, the limit state design equation is improved, and the formula for calculating fatigue life of slab bottom empty cement concrete pavement is derived. The finite element software was used to simulate and analyze the variation characteristics of temperature stress of slab bottom void pavement, and the fatigue life of slab bottom empty cement concrete pavement was determined under the condition of interlayer contact. The mathematical calculation method of fatigue life under interlaminar contact is recommended. This study can not only provide a theoretical basis for the mechanical analysis of slab bottom voided cement concrete pavement under the condition of interlayer contact, but also have a certain guiding significance for the design of cement concrete pavement interlayer. This paper provides a theoretical basis for predicting fatigue life of voided cement concrete pavement under the coupling of interlayer contact state and influencing factors.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.216

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