基于动变形控制法的路基临界高度与湿度关系研究

发布时间：2018-05-28 20:49

本文选题：动变形控制 + 长期交通荷载　；参考：《岩土力学》2014年01期

【摘要】：从力学角度出发,以路基在长期交通荷载作用下不至于变形过大为主要目的,利用动变形控制法,针对路基高度与湿度的相互关系进行了研究。首先,通过室内试验获得了路基土体回弹模量与湿度及压实度的定量关系式;同时基于层状公路结构动力响应解及路基、路面协调变形原理,获得了路基顶面动变形控制标准。结合试验结果和路基顶面动变形控制标准,建立了路基湿度、压实度与路基高度之间的联系。最后,以两种典型沥青混凝土公路结构为例,编制程序进行了数值计算,分析了满足动变形条件下的路基临界高度随路基湿度、压实度的变化规律。结果表明:路基临界高度随着路基湿度的增加而增大。路基湿度低于最优含水率时,路基临界高度随路基湿度和压实度的变化均较小;路基湿度高于最优含水率时,路基临界高度迅速增大,且压实度对临界高度的影响也变得十分显著。研究结果为路基高度和湿度的合理取值提供了新的思路。
[Abstract]:From the point of view of mechanics, the main purpose of this paper is to study the relationship between the height and humidity of roadbed by using the dynamic deformation control method, aiming at the main purpose of the roadbed not to deform too much under the action of long-term traffic load. First, the quantitative relationship between the elastic modulus and humidity and compaction degree of subgrade soil is obtained through laboratory tests, and the control standard of dynamic deformation of the top surface of roadbed is obtained based on the dynamic response solution of layered highway structure and the principle of subgrade and pavement deformation coordination. Based on the test results and the control standard of dynamic deformation of the top surface of the roadbed, the relationship between the subgrade humidity, compactness and the height of the roadbed is established. Finally, taking two typical asphalt concrete highway structures as examples, a program is compiled to calculate the critical height of roadbed under the condition of dynamic deformation, and the variation law of the critical height with the moisture and compactness of the roadbed is analyzed. The results show that the critical height of roadbed increases with the increase of subgrade humidity. When the moisture content of the subgrade is lower than the optimal moisture content, the critical height of the roadbed changes little with the moisture and compaction of the roadbed, and the critical height of the roadbed increases rapidly when the moisture content of the roadbed is higher than the optimal moisture content. The effect of compaction on critical height is also very significant. The results provide a new idea for the reasonable value of subgrade height and humidity.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;西安科技大学建筑与土木工程学院;河南省电力勘测设计院;
【基金】：国家自然科学基金(No.51209201,No.51279198) 武汉市青年科技晨光计划项目(No.201150431070) 西部交通建设科技项目(No.2011318493720,No.20113184931700)
【分类号】：U416.1

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