A method for overlaying rigid pavement
A rigid and pavement technology, which is applied in the field of overlaying rigid pavements, can solve the problem that the deflection of the road surface cannot be controlled, so as to improve service capability and service life, prevent shear and shear fatigue damage, and have broad application prospects Effect
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Embodiment 1
[0041] (1) The original cement concrete pavement structure of a highway is: soil base + 18cm4% cement stabilized macadam subbase + 18cm6% cement stabilized macadam base + 1cm asphalt surface waterproof layer + 28cmC35 cement concrete surface. Over the past 10 years since it was opened to traffic, the traffic volume has far exceeded expectations, and various damage forms including shear damage have appeared. The road surface has serious diseases. It is difficult to guarantee the service level only by maintenance measures such as medium and minor repairs. Add asphalt layer.
[0042] (2) Existing research and engineering practice have shown that in the case of complete continuity between layers, the composite asphalt pavement structure is dominated by shear failure of the asphalt layer. The original pavement structure and the asphalt layer on it are equivalent to the equivalent structure of elastic half-space body + rigid interlayer + asphalt surface layer. Such as figure 1 As ...
Embodiment 2
[0066] Since the modulus of the cement concrete layer is much greater than the modulus of the overlaid asphalt layer and the modulus of the semi-rigid base layer under it, it can be regarded as a rigid interlayer. Using the calculation method commonly used in this field, taking different rigid interlayer modulus values, according to the regulations in the highway asphalt pavement design specification, using the multi-layer elastic continuous system theory under the action of double-circle vertical uniform load to calculate the road surface bend of the pavement structure Shen, to obtain the change rule of the surface deflection value of the cement pavement structure overlaying the asphalt layer with the modulus of the rigid interlayer, see Figure 4 . Mechanical calculation and theoretical analysis show that the deflection value of the asphalt layer is small, and it decreases with the increase of the modulus of the rigid interlayer, and gradually tends to be flat. It is difficu...
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