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摘要:
接缝的传荷性能需定期检测以指导机场刚性道面的维护和使用，针对现有检测方法（如落锤式弯沉仪）难以进行偏远山区和交通运输困难地区的机场测试问题，提出了普通加载车辆跳车试验法，探究传力杆自身参数和道面结构参数对传荷性能和道面振动特性（基频、幅值、相位差）的影响规律，找出主要影响因素为传力杆弹性模量和土基模量；建立多因素下传荷性能和道面振动特性的定量关系，并通过室外试验验证该公式的准确性和方法的可行性。
Abstract:Load transfer ability needs to be detected termly to guide the maintenance and usage of concrete pavement of airport, while using the existing methods (such as falling weight deflectometer) is difficult to implement airport testing in remote mountain areas and the areas where transportation is difficult. Therefore, a bumping method of common vehicle is proposed to analyze the influence of dowel bar and pavement structure parameters on load transfer ability and pavement vibration characteristics (i.e., fundamental frequency, amplitude and phase difference). It is found that the elasticity modulus of dowel bar and subgrade modulus are the main effect factors. The quantitative relationship between load transfer ability and pavement vibration cha-racteristics is established with multiple factors, and the accuracy of formulas and the feasibility of bumping method are verified by outdoor experiments.
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Key words:
- load transfer ability /
- fundamental frequency /
- amplitude /
- phase difference /
- experiment
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图 2 传力杆参数对传荷性能的影响
Figure 2. Influence of dowel bar parameters on load transfer ability
图 3 道面结构参数对传荷性能的影响
Figure 3. Influence of pavement structure parameters on load transfer ability
图 4 传力杆直径对道面振动特性的影响
Figure 4. Influence of dowel bar diameter on pavement vibration characteristics
图 5 传力杆长度对道面振动特性的影响
Figure 5. Influence of dowel bar length on pavement vibration characteristics
图 6 传力杆间距对道面振动特性的影响
Figure 6. Influence of dowel bar distance on pavement vibration characteristics
图 7 传力杆弹性模量对道面振动特性的影响
Figure 7. Influence of dowel bar elasticity modulus on pavement vibration characteristics
图 8 面层厚度对道面振动特性的影响
Figure 8. Influence of surface thickness on pavement vibration characteristics
图 9 面层弹性模量对道面振动特性的影响
Figure 9. Influence of surface elasticity modulus on pavement vibration characteristics
图 10 基层厚度对道面振动特性的影响
Figure 10. Influence of base thickness on pavement vibration characteristics
图 11 基层弹性模量对道面振动特性的影响
Figure 11. Influence of base elasticity modulus on pavement vibration characteristics
图 12 土基弹性模量对道面振动特性的影响
Figure 12. Influence of soil elasticity modulus on pavement vibration characteristics
参数 水泥混凝土面层 水泥稳定碎石基层 土基 传力杆 弹性模量/MPa 36 000 1 500 80 210 000 密度/(kg·m-3) 2 500 2 000 1 800 7 850 泊松比 0.15 0.25 0.35 0.30 
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表 2 静态试验结果
Table 2. Results of static experiment
质量/
kg受荷板位移/mm 未受荷板位移/mm 传荷系数/
%传荷系数均值/% 480 0.232 0.220 94.8 720 0.355 0.335 94.6 94.6 960 0.463 0.437 94.4
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表 3 动态试验结果
Table 3. Results of dynamic experiment
基频/
Hz受荷板幅值/(10-4g) 未受荷板幅值/(10-4g) A1063 A1050 平均值(A1) A1045 A1058 平均值(A2) 12.84 7.49 7.47 7.48 7.39 7.38 7.385
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