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《Earthquake Engineering and Engineering Dynamics》 2018-02
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Analysis on the deformation characteristics for roadbed under vehicle loads

MENG Shangjiu;ZHOU Jian;WANG Miao;CHENG Youkun;SUN Yiqiang;Harbin University of Science and Technology;  
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.
【Fund】: 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)~~
【CateGory Index】: U416.1
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