Plastic deformation analysis of double-layer continuous paving for large thickness water stabilized base course
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Abstract:
In order to obtain the plastic deformation law of the base under large thickness continuous paving, and find solution to the problem of lack of relevant control standards for the construction smoothness of large thickness continuous paving technology, the incremental elastic Duncan-Chang model is studied and improved by using D-P yield criterion. The yield limit of uncured water-stable mixture is 220 kPa by triaxial shear test and field test, and the initial tangent modulus is determined to be 500 kPa, from which a prediction formula for deformation value of uncured cement stabilized macadam base during construction period is obtained. Then the number of repeated loads in the most unfavorable position of the pavement is calculated, and the Wolff and Visser permanent deformation prediction model is introduced to establish the construction displacement prediction model of the lower bearing stratum. Finally, by studying the smoothness transfer law and the disturbance effect of the construction vehicles on the base stratum under the double-layer continuous paving, the smoothness control principle of the continuous paving is proposed. The smoothness of middle and lower layers of continuous paving layer should be controlled according to the construction standard of the lower layer, and that of the other layers should be controlled according to the traditional paving construction standard.
