Dynamic Deflection Response of Typical Pavement Structure under Different Impact Loads

doi:10.12382/bgxb.2022.0413

Abstract

Abstract:

In order to study the numerical law of dynamic deflection response of typical pavement structure under different impact loads, the grade highway information is experimentally surveyed, the measured data is analyzed, the correlation between grade highway bearing capacity and pavement structure is summarized, and the typical pavement structure under the dimension of bearing capacity is constructed based on the statistical law. And then a multi-layer continuous road structure model including plastic damage is established. The effectiveness of the model is verified by comparing the simulation results with the experimental data, and the influence of the size of the model on the simulation results of pavement deflection under different impact loads is studied. Finally, the deflection response law of typical pavement structure under different impact loads is studied, the peak settlement and residual settlement of pavement under impact load are calculated, and the internal law of deflection response of typical pavement structure under different impact loads is revealed. The result shows that the multi-layer continuous road structure model including plastic damage can accurately reflect the real dynamic deflection response of pavement under impact load; under different impact loads, the proportion of plastic settlement in pavement settlement and the amplitude of impact load meet the double exponential equation; in the range of 100 tons, the elastic rebound part of pavement settlement increases with the increase of impact load amplitude, and the plastic settlement part has an exponential positive correlation with load amplitude; the elastic rebound in pavement settlement reaches the upper limit of 1.2-1.3mm above 100 tons, the plastic settlement of pavement has a linear relationship with the load amplitude. In addition, the research on the influence of model size on simulation results under different impact loads can provide a reference for determining the appropriate size of simulation model in finite element simulation.

Key words: grade highway, impact load, dynamic deflection response, finite element simulation

CLC Number:

TJ81⁺0

JI Xinbo, LU Weijian, LÜ Chen, WANG Xi, LIAN Zheng, HE Li. Dynamic Deflection Response of Typical Pavement Structure under Different Impact Loads[J]. Acta Armamentarii, 2024, 45(1): 299-311.

Figures/Tables 26

References 20

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层数及总厚度	2层道路	3层道路	4层道路
第1层	177.15	101.83	84.62
第2层	241.32	245.45	220.59
第3层		270.81	223.66
第4层			218.63
总厚度	418.47	618.09	747.50

层数及总厚度	2层道路	3层道路	4层道路
第1层	177.15	101.83	84.62
第2层	241.32	245.45	220.59
第3层		270.81	223.66
第4层			218.63
总厚度	418.47	618.09	747.50

Pearson相关性	弯沉均值	弯沉最大值
面层厚度	-0.18	-0.19
路层总厚度	-0.06	-0.07

Pearson相关性	弯沉均值	弯沉最大值
面层厚度	-0.18	-0.19
路层总厚度	-0.06	-0.07

聚类中心	面层厚度/mm	基层厚度/mm
聚类中心1	190.01	219.93
聚类中心2	48.60	308.95
聚类中心3	235.20	296.01
聚类中心4	36.12	195.55