3-D numerical analysis of influence of layer modulus on structural responses of asphalt pavements
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摘要: 目前关于路面结构层模量对路面结构力学响应影响的研究一般是利用弹性层状理论进行分析。从三维数值分析的角度, 分别从路表弯沉、面层和基层内的压应力及拉应力等方面说明了结构层模量及基层条件对路面结构力学响应的影响。分析认为路面各结构层模量的提高能减小路面表面弯沉, 较高的基层模量会增大面层内的压应力, 较高的底基层模量能减小基层底面的拉应力。有关分析结果对路面结构的设计和施工具有参考价值Abstract: At present, influence of layer modulus on structural responses of asphalt pavements is analyzed using general Burmister theory. However, pavement responses under axle loading is three dimensional (3D) in nature. Using 3-D numerical simulation, this paper reports the impact of pavement structural module on pavement surface deflection, compressive stress and tensile stress at the bottom of surface and base respectively. The results indicate that the higher layer modulus are, the lower surface deflectiones, the higher base's module can result in great vertical compressive stress at asphalt layer, and the higher subgrade's module can result in lower tensile stress at the bottom of base. The analysis results have great value to design and construction of asphalt pavements.
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Key words:
- pavement mechanics /
- module /
- 3-D numerical analysis /
- surface deflection /
- stress
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图 3 不同方案下沿路面横向分布的路表竖向位移
Figure 3. Vertical displacements along pavement cross section in different scenarios
图 4 轮隙中心下沿路面深度分布的竖向位移
Figure 4. Vertical displacements along pavement depth at center of dual tires
图 5 不同方案下路面结构层内竖向压应力
Figure 5. Vertical compressive stress of surface lay in different scenarios
表 1 计算分析方案
Table 1. Analysis scenarios
结构层 各计算方案结构层模量/MPa 1# 2# 3# 4# 5# 6# 7# 8# 上面层 1500 1500 1500 1000 2500 1500 1500 1500 中面层 1200 1200 1200 800 1800 1200 1200 1200 下面层 1200 1200 1200 800 1800 1200 1200 1200 基层 1500 500 2500 1500 1500 1500 500 500 底基层 800 800 800 800 800 200 200 200 土基 40 40 40 40 40 40 40 80 
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表 2 各计算方案下的路表弯沉
Table 2. Surface deflection of pavement structures
计算方案 1# 2# 3# 4# 5# 6# 7# 8# 路表弯沉(A)/0.01 mm -24.36 -29.89 -22.88 -25.83 -23.12 -31.28 -38.72 -29.79
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表 3 各计算方案下路面结构层内压应力
Table 3. Compressive stress of pavement structure in different scenarios /MPa
计算方案 1# 2# 3# 4# 5# 6# 7# 8# 中面层底压应力 -0.454 -0.397 -0.473 -0.468 -0.423 -0.438 -0.384 -0.385 面层底压应力(B) -0.303 -0.260 -0.318 -0.368 -0.327 -0.339 -0.294 -0.295 基层底压应力(C) -0.082 -0.086 -0.079 -0.104 -0.087 -0.072 -0.074 -0.079 土基表面压应力(D) -0.014 -0.016 -0.013 -0.018 -0.015 -0.017 -0.020 -0.026
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表 4 各计算方案下路面结构层内拉应力
Table 4. Tensile stress of pavement structure in different scenarios /MPa
计算方案 1# 2# 3# 4# 5# 6# 7# 8# 下面层底拉应力(B) -0.050 0.018 -0.080 -0.088 -0.030 -0.069 0.067 0.069 基层底拉应力(C) 0.024 -0.005 0.044 0.028 0.037 0.141 0.052 0.046
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