车辆荷载下路基变形特性分析  

Analysis on the deformation characteristics for roadbed under vehicle loads

作　　者：孟上九[1] 周健[1] 王淼[1] 程有坤 孙义强[1] MENG Shangjiu;ZHOU Jian;WANG Miao;CHENG Youkun;SUN Yiqiang(Harbin University of Science and Technology, Harbin 150080, China)

机构地区：[1]哈尔滨理工大学,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2018年第2期35-41,共7页Earthquake Engineering and Engineering Dynamics

基　　金：黑龙江省自然科学基金项目(E2016045);国家自然科学基金项目(51378164);哈尔滨市应用技术研究与开发项目(2016RAXXJ038)~~

摘　　要：采用光纤布拉格光栅(FBG)技术监测路基动态变形,并结合数值模拟手段可以有效分析车辆荷载下路基的变形特性。本文对埋设FBG传感器的试验路段进行车辆荷载作用下路基动态加载—卸载试验,监测其动态变形响应。结合现场实测数据,通过FLAC3D软件对路基在车辆荷载下动态变形响应进行了模拟。结果表明:在1.4 t车辆荷载作用下,弹性变形均是塑性变形的8倍左右,数值模拟与现场监测获得的路基动态变形趋势一致,均以弹性变形为主、塑性变形较小;表明建模方法、参数选取及计算过程合理。在此基础上,利用经过校验的计算方法对不同车辆荷载下路基动态变形进行了多工况计算分析,分析中发现:路基弹性变形、塑性变形同车辆荷载非线性关系显著:荷载增加4倍时,弹性变形增加约4倍、塑性变形增加4倍;车辆荷载增加9倍时,弹性变形增加约11倍、塑性变形增加约13倍。因此,应对重载车辆对路基的破坏作用给予足够关注。采用现场测试与数值模拟相结合的方法,可较为高效合理地分析路基动态变形响应,为道路工程防灾减灾及安全评价提供了技术手段。The FBG techniques were used to monitor the dynamic deformation of the roadbed. Combining with the numerical simulation,the roadbed＇s deformation characteristics under vehicle loads were analyzed effectively. In this paper the dynamic loading-unloading filed tests under vehicle loads were conducted on the testing road where the FBG sensors were buried. Then the dynamic response of roadbed was recorded. Based on the results gained by field test,the roadbed＇s dynamic responses under vehicle loads were simulated by using FLAC3 D software. The results showed that the deformation features obtained by simulation and field test are consistent. That is to say,the deformation is mainly elastic deformation,and the plastic deformation takes only a little part. Under 1. 4 t vehicle load,the elastic deformation is 8 times as large as the plastic deformation for both the field test and simulation.Therefore,it can be deduced that the way of building model,the selection of parameters and calculation method are feasible. In this way,the roadbed dynamic deformation under different vehicle loads were calculated. During the numerical analysis,there is a significant nonlinear relationship between the roadbed＇s plastic deformation,elastic deformation and vehicle loads. When vehicle load added 4 times,the elastic deformation increased 4 times,andthe plastic deformation increased by four too. When vehicle load added 9 times,the plastic deformation added 11 times,the plastic deformation added 13 times. So the destroy of roadbed under heavy load should be paid more attention. In this paper,the field tests and numerical simulation were combined to analyze the roadbed＇s dynamic response,and it will provide some reference for the road＇s disaster prevention and mitigation or its safety evaluation.

关 键 词：光纤布拉格光栅 路基动态变形 现场监测 FLAC3D软件 数值模拟 

分 类 号：U416.1[交通运输工程—道路与铁道工程]