摘要
中国西北、华北地区因地制宜,选取粉土作为道基填料,在机场的服役过程中,“锅盖效应”或降雨入渗等易引发局部积水而使粉土道基湿化。在飞机荷载作用下,粉土湿化对不同跑道结构参数的道基应力响应影响显著。本文通过自研的湿化粉土道基加载模型试验系统,研究了粉土不同湿化程度的土体应力响应特征,并且建立数值仿真模型,分析了道面板相互作用机制,面层和基层厚度、刚度等不同跑道结构参数下湿化对道基敏感区域应力响应特征的影响规律。结果表明:道面板间接缝传荷能力对道基应力响应的影响较小。粉土湿化促进了道基中的应力叠加效应,也增加了道基应力响应对跑道结构参数变化的敏感性,但降低了应力响应深度对跑道结构参数变化的敏感性。在受荷较大的道面板中心点下,粉土湿化下水泥道面板刚度对道基应力响应的影响较小,基层弹性模量是道基应力响应的主要影响因素;面层厚度和基层厚度是受荷道面板外侧角点下道基应力响应的主要影响因素,合理的基层参数能有效地降低湿化对道基受力状态的影响。研究成果能为机场工程跑道结构设计、优化及道基病害处理等提供技术依据。
Silt is often selected as the filling soil in the northwest and north China.“Pot cover effect”or rainfall infiltration are easy to cause localized wetting during the service period of airport.The wetting of silt has a significant impact on the stress response derived from the action of aircraft loading in subgrade with different structural parameters of runway.Accordingly,the stress response characteristics of silt subgrade with different degrees of wetting were investigated through the self-developed model test system,and the numerical model was then established and verified based on the laboratory tests.The interaction mechanisms of pavement slabs and the influence of wetting on stress response characteristics in the sensitive area of subgrade were analyzed via the numerical simulation under different structural parameters(e.g.,the thickness and module of pavement and basement layers)of runways.The results showed that the load transfer capacity of joints had little influence on the stress response in the subgrade.The wetting of silt promoted the stress superposition effect in the subgrade,and it also increased the sensitivity of stress response in the subgrade derived from different runway parameters,while it decreased the sensitivity of the loading response depth.Under the center of the larger loading pavement,the stress response of subgrade was little affected by the stiffness of cement pavement,but largely affected by the elastic modulus of the base layer under the wetting condition.The thickness of the surface layer and base layer are the main influencing factors under the outer corner of the loading pavement,and the suitable parameters of the base layer can effectively reduce the influence of wetting on the stress state of subgrade.The research results could provide a technical basis for runway structure design,optimization,and disease treatment of subgrade in airport engineering.
作者
罗其奇
张升
李强
叶新宇
张兴胜
余虔
LUO Qiqi;ZHANG Sheng;LI Qiang;YE Xinyu;ZHANG Xingsheng;YU Qian(School of Civil Eng.,Central South Univ.,Changsha 410075,China;Beijing New Airport Construction Headquarters,Beijing 102600,China;Hohhot Airport Construction Management Investment Co.Ltd.,Hohhot 010000,China;Dept.of Geotechnical Eng.,China Airport Planning&Design Inst.Co.Ltd.,Beijing 100020,China;Observation and Research Base of Transport Industry of Airport Eng.Safety and Long-term Performance,Beijing 100020,China)
出处
《工程科学与技术》
EI
CSCD
北大核心
2023年第3期87-99,共13页
Advanced Engineering Sciences
基金
国家自然科学基金项目(52008401)
国家自然科学基金联合基金项目(U1834206)
湖湘高端人才聚集计划创新团队项目(2019RS1008)
湖南省自然科学基金项目(2021JJ40770)。
关键词
跑道结构参数
粉土道基
湿化
应力响应
影响区域
runway structural parameters
silt subgrade
wetting
stress response
influencing region
