交通动荷载引起的公路路基应力响应试验研究  

Research on the Stress Response of Highway Subgrade Caused by Dynamic Traffic Load

作　　者：耿大新[1] 杨泽晨 王宁 祝俊华 黄玉纯 GENG Da-xin;YANG Ze-chen;WANG Ning;ZHU Jun-hua;HUANG Yu-chun(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;Nanchang Railway Survey and Design Institute Co.Ltd.,Nanchang 330002,China)

机构地区：[1]华东交通大学土木建筑学院,南昌市330013 [2]南昌铁路勘测设计院有限责任公司,南昌市330002

出　　处：《公路》2021年第12期1-7,共7页Highway

基　　金：国家自然科学基金项目,项目编号51768021、51868021;江西省自然科学基金项目,项目编号20202BABL204051。

摘　　要：为预防和整治路基病害问题,查明长期服役状态下的路基动应力分布是关键因素之一。依据相似理论设置了精细化的小比例路基模型;通过对路基模型施加简谐荷载,分析加载幅值、频率等因素对路基动应力的影响,并以路基的应力状态为指标来判定路基工作区深度及交通荷载的影响范围。结果表明:交通荷载的影响范围主要集中在轮载的正下方,水平方向的有效作用距离几乎可以忽略不计,在实际公路病害整治中可定点整治;路基动应力随加载幅值增大而增大,随加载频率增大而减小,且加载幅值对路基的影响程度要显著高于频率的影响程度;一般公路路基工作区深度为100~110 cm,施工时应确保此范围内路基土体的填筑质量。To find out the dynamic stress distribution of subgrade under long-term service is one of the key factors so as to prevent and treat subgrade defects. Based on the similarity theory, a refined small-scale subgrade model is established;by applying harmonic load to the subgrade model, the influence of loading amplitude, frequency and other factors on the dynamic stress of subgrade is analyzed, and the stress state of subgrade is taken as the index to determine the depth of subgrade working area and the influence range of traffic load. The results show that the influence range of traffic load is mainly concentrated under the wheel load, and the effective distance in the horizontal direction is almost negligible, therefore in practice, the road defects can be treated at fixed points;the dynamic stress of subgrade increases with the increase of loading amplitude and decreases with the increase of loading frequency, and the influence of loading amplitude on subgrade is significantly higher than that of loading frequency;and generally, the depth of highway subgrade working area is about 100 cm to 110 cm, and the filling quality of subgrade soil within this range should be ensured during construction.

关 键 词：道路工程 路基工作区 模型试验 动应力 

分 类 号：U416.1[交通运输工程—道路与铁道工程]