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Loading transmission type semi-rigid base asphalt pavement structure

A technology of semi-rigid base and asphalt pavement, which is applied to cohesive pavement, roads, roads and other directions paved on site. It can solve the problems of unequal service life, inconvenient maintenance and easy damage of asphalt surface, and achieve the goal of improving rigidity. Effect

Inactive Publication Date: 2019-07-09
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention provides a load-transmitting semi-rigid base asphalt pavement structure, which aims to solve the inconvenience of maintenance and short service life caused by the design of the base and surface course according to the idea of ​​equal service life for existing expressways. In most cases, among the semi-rigid base asphalt pavement structural layers, the asphalt surface layer is usually the most easily damaged, and in some cases, the semi-rigid base will also be damaged, and the roadbed is rarely damaged, showing that the service life of each layer is not equal. state

Method used

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  • Loading transmission type semi-rigid base asphalt pavement structure
  • Loading transmission type semi-rigid base asphalt pavement structure
  • Loading transmission type semi-rigid base asphalt pavement structure

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Experimental program
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Embodiment approach

[0035] Implementation Plan (Structure Check Calculation and New Pavement Design)

[0036] The semi-rigid base asphalt pavement of an expressway is designed according to the load-transfer semi-rigid base asphalt pavement structure, and the design service life is 15.0 years. Calculate and analyze the theoretical deflection value and For the tensile stress at the bottom of the layer, the fatigue life of the structural layer can be obtained by back-calculating the cumulative equivalent axial times according to formula 1 and formula 2.

[0037]

[0038]

[0039] Table 1 The asphalt pavement structure and design parameters of a load-transferring semi-rigid base for a highway

[0040]

[0041] According to the theoretical analysis software BISAR3.0 of the elastic layered system, the deflection of the top surface of each structural layer and the tensile stress at the bottom of each structural layer in Table 1 are calculated, and the theoretical deflection value can be convert...

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Abstract

The invention discloses a loading transmission type semi-rigid base asphalt pavement structure. The loading transmission type semi-rigid base asphalt pavement structure is composed of an asphalt surface layer, a semi-rigid base, a rigidity transition layer and a roadbed, the asphalt surface layer is arranged on the semi-rigid base, and the semi-rigid base is arranged on the rigidity transition layer; the rigidity transition layer is arranged on the roadbed, the asphalt surface layer is composed of upper, middle and lower surface layer parts, and the upper and middle surface layer parts are arranged on the lower surface layer part; a traditional bearing type semi-rigid base asphalt pavement structure is converted into the loading transmission type semi-rigid base asphalt pavement structure,and the service life of the semi-rigid base and the asphalt surface layer is further prolonged. According to the loading transmission type semi-rigid base asphalt pavement structure, the durability of an asphalt pavement is significantly improved, the whole life cycle cost is effectively reduced, and the standard and service level of road construction are improved.

Description

technical field [0001] The invention belongs to the technical field of highway design and construction, in particular to a load-transferring semi-rigid base asphalt pavement. Background technique [0002] my country's traditional design method stipulates that the road structure is composed of multi-layer structures such as the surface layer, base layer, subbase layer, and cushion layer; the design service life of the new asphalt pavement structure: the design life of the asphalt pavement of expressways and first-class highways is 15 years, 12 years for secondary roads, 8 years for tertiary roads, and 6 years for quaternary roads, and the design life of the surface layer and the base layer are equal. The semi-rigid base asphalt pavement structure designed under the guidance of existing design standards is a load-bearing structure. The damage of the semi-rigid base in the pavement structure mainly comes from the tensile stress (tensile strain) at the bottom of the layer, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/32
CPCE01C7/32
Inventor 吕松涛樊国鹏郑健龙王笑风
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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