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Structural layer thickness design method for mixed base course cement concrete pavement

A cement concrete and hybrid technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as being too conservative and not scientifically reasonable in design

Active Publication Date: 2016-09-28
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to develop a method for designing the structural layer thickness of a hybrid base cement concrete pavement, which can solve the problem of a hybrid base cement concrete pavement composed of a non-rigid base and a semi-rigid sub-base or a flexible sub-base in the current specification Problems in the design method of structural layer thickness, and effectively solve the problem that it is not scientific and reasonable and too conservative when designing with reference to other methods

Method used

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  • Structural layer thickness design method for mixed base course cement concrete pavement
  • Structural layer thickness design method for mixed base course cement concrete pavement
  • Structural layer thickness design method for mixed base course cement concrete pavement

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Embodiment 1

[0052] The reference period for cement concrete pavement construction of an expressway is 30 years, the target reliability is 95%, and the safety level is first class. The proposed pavement structure form is: ordinary concrete surface (elastic modulus E c , thickness h c , Poisson's ratio v c , the standard value of bending and tensile strength is f r )+4cm asphalt concrete interlayer+roller compacted concrete base (elastic modulus E 1 , thickness h 1 , Poisson's ratio v 1 , the standard value of bending and tensile strength is f r1 )+cement-stabilized macadam subbase (elastic modulus E 2 , thickness h 2 , Poisson's ratio v 2 )+ graded crushed stone layer (elastic modulus E a , thickness h a ).

[0053] According to the rebound modulus of the subgrade soil and the distance between the top of the road bed and the groundwater level, determine the comprehensive rebound modulus E of the road bed top 0 , and then according to the elastic modulus E of the pellet layer a...

Embodiment 2

[0082] The reference period for cement concrete pavement construction of an expressway is 30 years, the target reliability is 95%, and the safety level is first class. The proposed pavement structure form is: ordinary concrete surface (elastic modulus E c , thickness h c , Poisson's ratio v c , the standard value of bending and tensile strength is f r )+4cm asphalt concrete interlayer+roller compacted concrete base (elastic modulus E 1 , thickness h 1 , Poisson's ratio v 1 , the standard value of bending and tensile strength is f r1 )+ densely graded asphalt stabilized macadam subbase (elastic modulus E 2 , thickness h 2 , Poisson's ratio v 2 )+ graded crushed stone layer (elastic modulus E a , thickness h a ).

[0083] According to the rebound modulus of the subgrade soil and the distance between the top of the road bed and the groundwater level, determine the comprehensive rebound modulus E of the road bed top 0 , and then according to the elastic modulus E of th...

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Abstract

The invention discloses a structural layer thickness design method for a mixed base course cement concrete pavement. The structural layer thickness design method comprises the following steps that the comprehensive equivalent weight rebound modulus of a plate bottom foundation is calculated; the equivalent bending rigidity and the equivalent thickness of a mixed base course are calculated according to situations of a rigid base course and a semi-rigid subbase course and the rigid base course and a soft subbase course; load stress, load fatigue stress, a interlayer contact condition parameter, vertical contact rigidity, the maximum temperature stress, the temperature fatigue stress and the like are calculated according to the calculation results of the equivalent bending rigidity and the equivalent thickness through an elastic foundation doubling plate model; structural limiting state is checked, the situation that no limit breakage occurs is taken as a checking standard, and whether the drafted structural layer thickness meets requirements or not is determined. The problems of unnecessary waste and early serious damages caused by the unreasonable structural layer thickness design of the mixed base course cement concrete pavement can be effectively avoided, and the method has good social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and relates to a method for designing the thickness of a structural layer of a cement concrete pavement with a mixed base. Background technique [0002] In the early days of our country, cement concrete pavement was mainly built. At present, when the requirements for the bearing capacity of pavement structure are high, cement concrete pavement is still the main structural form to choose from. In foreign countries, cement concrete pavement is also widely used because of its long service life. The construction and application of cement concrete pavement can reduce dependence on petroleum resources, make full use of my country's relatively abundant cement and fly ash materials, and drive local economic development. For high-grade highways, the design life of asphalt pavement is 15 years, and that of cement concrete pavement is 30 years, and the investment cost of cement concrete pavement is...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 李盛杨帆刘朝晖曹前
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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