Pore water pressure characteristics of semi-rigid base for cement concrete pavement
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摘要: 基于多孔介质弹性理论, 运用ABAQUS有限元分析软件对水泥混凝土路面半刚性基层的孔隙水压力进行了数值模拟, 计算了不同外部荷载和路面结构条件下的基层孔隙水压力分布规律。分析结果表明: 在饱水状态下, 基层孔隙水压力随面层厚度、面层模量、基层厚度与基层渗透系数的增大而减小, 随基层模量的增大而增大, 但面层和基层模量对孔隙水压力的影响不显著; 孔隙水压力随交通荷载的增大而呈线性增大, 在荷载相同时, 荷载分布越密集, 对基层孔隙水压力分布的影响越显著, 加载模式只影响孔隙水压力的消散过程; 孔隙水压力随行车速度的增大而增大, 消散过程加快。Abstract: The pore water pressure of semi-rigid base for cement concrete pavement was simulated by using finite element analysis software ABAQUS based on poroelasticity, and the distribution laws of pore water pressure along the base depth were calculated under different external loading conditions and pavement structures. Analysis result shows that in water-saturated state, pore water pressure decreases with the increase of surface thickness, surface elastic modulus, base thickness and base permeability, but increases with the increase of base elastic modulus. The elastic moduli of surface and base have no obvious impacts on pore water pressure. Meanwhile, pore water pressure linearly increases with the increase of traffic load. With the same load, denser load distribution impacts pore water pressure distribution more significantly. Loading modes only influence the dissipation of pore water pressure. With the increase of vehicle speed, pore water pressure increases, and its dissipation becomes fast.
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图 4 不同面层厚度下的孔隙水压力峰值
Figure 4. Peak pore water pressures of base at different surface thickness
图 5 不同面层模量下的孔隙水压力峰值
Figure 5. Peak pore water pressures of base at different surface moduli
图 6 不同面层渗透系数下的孔隙水压力峰值
Figure 6. Peak pore water pressures of base at different surface permeabilities
图 7 不同基层厚度下的孔隙水压力峰值
Figure 7. Peak pore water pressures of base at different base thicknesses
图 8 不同基层模量下的孔隙水压力峰值
Figure 8. Peak pore water pressures of base at different base moduli
图 9 不同基层渗透系数下的孔隙水压力峰值
Figure 9. Peak pore water pressures of base at different base permeabilities
图 11 Peak pore water pressures of base at different loads
Figure 11. Peak pore water pressures of base at different distributed loads
图 14 不同加载模式下的基层孔隙水压力峰值
Figure 14. Peak pore water pressures of base under different loading modes
表 1 外部荷载计算参数
Table 1. Calculation parameters of exterior load
表 2 路面结构材料计算参数
Table 2. Calculation parameters of pavement materials
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