欢迎访问《兵工学报》官方网站,今天是

兵工学报 ›› 2024, Vol. 45 ›› Issue (1): 299-311.doi: 10.12382/bgxb.2022.0413

• • 上一篇    下一篇

不同冲击载荷下典型路面结构的动态弯沉响应

吉新博1, 卢卫建1, 吕琛2, 王玺1,*(), 廉政1, 何丽1   

  1. 1 北京航天发射技术研究所, 北京 100076
    2 96963部队, 北京 100192
  • 收稿日期:2022-05-19 上线日期:2024-01-30
  • 通讯作者:
  • 基金资助:
    国家自然科学基金项目(11902160)

Dynamic Deflection Response of Typical Pavement Structure under Different Impact Loads

JI Xinbo1, LU Weijian1, LÜ Chen2, WANG Xi1,*(), LIAN Zheng1, HE Li1   

  1. 1 Beijing Institute of Space Launch Technology, Beijing 100076, China
    2 Unit 96963 of PLA, Beijing 100192, China
  • Received:2022-05-19 Online:2024-01-30

摘要:

为研究不同冲击载荷下典型路面结构的动态弯沉响应数值规律,开展试验勘测等级公路信息,分析实测数据并归纳出等级公路承载能力与路面结构的相关关系,基于统计规律构建了承载力维度下的典型路面结构。建立包含塑性损伤的多层连续道路结构模型,通过比对仿真结果与试验数据验证模型的有效性,研究模型大小对不同冲击载荷作用下路面弯沉仿真结果的影响。开展不同冲击载荷下典型路面结构的弯沉响应规律研究,计算出冲击载荷作用下路面峰值沉降与残余沉降数值,揭示不同冲击载荷下典型路面结构弯沉响应内在规律。研究结果表明:包含塑性损伤的多层连续道路结构模型能够准确反映冲击载荷下路面真实动态弯沉响应;不同冲击载荷下,路面沉降中塑性沉降量占比与冲击载荷幅值满足双指数方程;百吨级范围内,路面沉降中弹性回弹部分随冲击载荷幅值增大而增大,塑性沉降部分与载荷幅值呈指数正相关关系;百吨级以上,路面沉降中弹性回弹量达到上限1.2~1.3mm,路面塑性沉降量与载荷幅值呈线性关系。开展的不同冲击载荷下模型大小对仿真结果的影响规律研究可为有限元仿真中确定合适的仿真模型尺度提供参考。

关键词: 等级公路, 冲击载荷, 动态弯沉响应, 有限元模拟

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

中图分类号: