不同湿度条件下残积红黏土路基动力响应规律研究  

Research on the Dynamic Response Law of Residual Red Clay Roadbed under Different Humidity Conditions

作　　者：陈成华 谢治 徐文章 CHEN Chenghua;XIE Zhi;XU Wenzhang(Guangxi Road Construction Engineering Group Co.,Ltd.,Nanning 530001,China;Guangxi New Development Transportation Group Co.,Ltd.,Nanning 530000,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]广西路建工程集团有限公司,南宁530001 [2]广西新发展交通集团有限公司,南宁530000 [3]中南大学土木工程学院,长沙410075

出　　处：《路基工程》2024年第6期61-69,共9页Subgrade Engineering

基　　金：广西路建工程集团有限公司:南湛高速高液限土路基填筑技术研究(YGS-NZYFB-JSFW-2021-002);中国中铁股份公司科技研究开发计划(2022-重大-13)。

摘　　要：在不同土体湿度、车辆轴重和行车车速下,对南宁—湛江高速公路K18+610试验断面开展现场行车测试,研究不同湿度条件下广西残积红黏土路基的动力响应规律,并提出设计施工措施建议。结果表明:动力特性在横向0~4.0 m和深度方向0~1.3 m区域内衰减较快,当超出这个范围时,行车作用对路基动力特性的影响较小;随着轴重、车速的增加,不同位置上的路基动应力、加速度和动位移均有不同程度的增大;路基含水率的变化会导致路基性能发生劣化,但对动应力、加速度和动位移等动态特性指标影响各不相同。Under different soil humidity,axle weight of vehicle and traveling speed,field driving test was carried out on K18+610 test section of Nanning-Zhanjiang Expressway to study the dynamic response law of Guangxi residual red clay roadbed under different humidity conditions and put forward design and construction measures suggestions.The results show that:the dynamic characteristics decay faster in the region of 0-4.0 m in the transverse direction and 0-1.3 m in the depth direction,and when exceeding this range,the influence of driving action on the dynamic characteristics of the roadbed is smaller;with the increase of axle weight and speed,the dynamic stress,acceleration and dynamic displacement of the roadbed in different positions increase to different degrees;the change of the water content of the roadbed will lead to the degradation of the performance of the roadbed,but to the dynamic stress,acceleration and dynamic displacement and other dynamic characteristic indexes are affected differently.

关 键 词：高速公路 红黏土路基 不同湿度 动力特性 含水率 防排水 限重限速 

分 类 号：TU411[建筑科学—岩土工程]