耒宜高速公路路基状况及其对基层疲劳寿命的影响研究

发布时间：2018-05-07 20:46

  本文选题：沥青路面 + 路基状况　； 参考：《长沙理工大学》2014年硕士论文

【摘要】：高等级公路路基状况及其对基层疲劳寿命的影响研究是近些年来道路工程界非常重视的一项应用性研究。其目的在于通过研究工程地质、气候水文、交通量、路面结构、荷载等要素,对高等级公路路基状况进行全面和深入的认识,形成一种科学合理的路基状况分析方法；并通过分析在不同荷载、不同土基回弹模量条件下路基路面各结构层的弯拉应力的变化,建立弯拉应力与疲劳寿命之间的关系,分析荷载与土基回弹模量等要素对基层疲劳寿命的影响,用以指导高等级公路大修处治。本文依托耒宜高速公路大修工程,以高等级公路沥青路面作为研究的重点。根据现场检测数据及相关研究成果,并结合当前我国沥青路面设计规范和技术指标,分析了高等级公路土基回弹模量的衰减及其对路面和基层的影响,取得的主要研究成果如下：(1)通过现场承载板试验可以看出,与正常路段比较,路面出现病害处基层模量衰减程度比面层模量衰减程度大的多,说明路面的病害与基层的损坏或者基层整体强度的降低有很大的关系。(2)由无损检测检测结果可知,耒宜高速公路路基病害分布广泛,并且病害发生段大多都是由两种或两种以上病害主导。从检测数据来看,耒宜高速公路基层不密实、沉陷、高含水量等病害较为严重,土基回弹模量在病害区域衰减程度较大。(3)通过BISAR软件计算发现,土基强度对沥青路面各结构层层底应力的影响都是线性的,并且受荷载等因素影响非常明显。随着土基回弹模量的衰减,无论是标准轴载还是超载作用下,路面疲劳寿命的衰减幅度都比较大,而在土基模量20-40MPa时疲劳寿命提高较为缓慢,40MPa以后的疲劳寿命增长较为迅速,因此只有将土基回弹模量控制在合理的水平,才能使路面不至于出现早期病害或者损坏,影响高等级公路通行能力。
[Abstract]:The research on the subgrade condition of high grade highway and its influence on the fatigue life of the base course is an applied research that has been attached great importance to in the field of road engineering in recent years. The purpose of this paper is to study the engineering geology, climate and hydrology, traffic volume, pavement structure, load and other factors, so as to form a scientific and reasonable analysis method of roadbed condition. The relationship between flexural stress and fatigue life is established by analyzing the variation of flexural stress of subgrade and pavement layers under different loads and different modulus of resilience of soil foundation. The influence of load and elastic modulus of soil foundation on the fatigue life of base is analyzed to guide the overhaul of high grade highway. Relying on the overhaul of Leiyi Expressway, this paper focuses on the asphalt pavement of high-grade highway. Based on the field test data and related research results, combined with the current design specifications and technical indexes of asphalt pavement in China, this paper analyzes the attenuation of resilience modulus of soil foundation of high grade highway and its influence on pavement and base course. The main research results obtained are as follows: (1) through the field load-bearing plate test, it can be seen that compared with the normal section of road, the attenuation degree of the base modulus of the road surface is much greater than that of the surface layer. It shows that there is a great relationship between the pavement disease and the damage of the base or the decrease of the overall strength of the base. (2) from the results of nondestructive testing, it can be seen that the roadbed diseases of Leiyi Expressway are widely distributed. And most of the diseases are dominated by two or more diseases. According to the test data, the base course of Leiyi Expressway is not dense, subsidence, high water content and other diseases are more serious, the modulus of resilience of soil foundation in the diseased area attenuation degree is larger. The influence of soil foundation strength on the bottom stress of each structure of asphalt pavement is linear, and it is obviously affected by load and other factors. With the attenuation of the resilience modulus of soil foundation, the fatigue life of pavement decreases greatly under the action of standard axle load or overload, but the fatigue life of pavement increases rapidly when the fatigue life of soil foundation modulus 20-40MPa increases slowly by 40MPa. Therefore, only if the elastic modulus of soil foundation is controlled at a reasonable level, can the pavement not be damaged or damaged in the early stage, which will affect the capacity of high grade highway.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
，

本文编号：1858408