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摘要: 在旧水泥混凝土路面改建中, 常采用冲击破碎方法处理原路面, 常规的层状连续模型不能反映破碎混凝土板块的工作状态, 因此, 建立了一种分块三维叠层结构有限元模型。该模型中的加铺层和地基弯沉是连续的, 破碎水泥混凝土板之间的弯沉是不连续的, 上下层之间的弯沉也可以是不连续的。分析结果表明, 加铺层、破碎水泥混凝土板和地基相互之间有脱空现象; 虽然破碎水泥混凝土板的弯沉呈双线性分布, 但是下层弯沉盆仍然包络上层弯沉盆; 在破碎水泥混凝土板缝两侧有弯沉差, 该处加铺层有集中弯矩和剪力差。对于具有间断刚性(或半刚性)基层的路面结构, 该模型是一种可供选择的计算方法。Abstract: When reconstruct old portland-cement-concrete pavement, the old pavement needs to be broken, the regular layer's continuous model doesn't match with the broken pavement, so a (3-D) overlay structure model was developed with finite element method. In the model, the overlay and subgrade's deflection is continuous, the broken pavement deflection is not so, the deflection between upper and low layers might not be continuous. The analyzing results show that there is an empty space among the overlay, broken pavement and subgrade; the broken pavement's deflection is dual linear distribution, the low deflection basin still contains the upper deflection basin; there is a deflection difference in the two sides of the broken pavement's seam, there are moment and shear differences in the overlay. To the disconnection rigid or half-rigid subgrade pavement structure, the model is a feasible calculation method.
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Key words:
- concrete pavement /
- rehabilitation /
- overlay structure model /
- break and seat
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表 1 中点弯沉w
Table 1. Deflections of mid-point /(10-2mm)
网格 解析解 本文解 相对差/% 2×2 30 21.6 28.0 3×3 20 15.9 20.5 5×5 12 10.5 12.5 10×10 6 6.0 0.0 
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表 2 5×5网格板弯沉盆
Table 2. Deflection basins of 5×5 mesh slab /(10-2mm)
点号 1 6 7 9 板块 10.3 10.5 地基 3.0 10.3 10.3 10.5
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表 3 5×5网格板弯沉盆
Table 3. Deflection basins of 5×5 mesh slab /(10-2mm)
点号 1 2 3 4 5 6 7 8 9 加铺层 1.97 3.20 4.47 5.80 7.24 8.67 8.67 9.45 9.64 下板块 1.91 3.17 4.44 5.72 7.02 8.32 8.79 8.90 8.96 地基 3.01 3.51 4.21 5.72 7.02 8.79 8.79 8.90 8.96
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