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A Simplified Calculation Method for the Resilience Modulus of Structure Layers of Highway with Four Structure Layers

A technique for calculating the modulus of resilience and simplifying calculations, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as calculation result deviations, achieve the effects of small calculation amount, improved calculation efficiency, and accurate results

Active Publication Date: 2022-04-08
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the transmission of deformation according to the interaction between layers is affected by the stiffness and thickness of each layer, the method of splitting first and then stacking often leads to a certain deviation in the calculation results

Method used

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  • A Simplified Calculation Method for the Resilience Modulus of Structure Layers of Highway with Four Structure Layers
  • A Simplified Calculation Method for the Resilience Modulus of Structure Layers of Highway with Four Structure Layers
  • A Simplified Calculation Method for the Resilience Modulus of Structure Layers of Highway with Four Structure Layers

Examples

Experimental program
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Effect test

Embodiment 1

[0079] Project overview: The proposed road is located in the Weiqiu area, the natural division of the road is II5 area, the seismic intensity is grade 6, and many places in the passing area are cohesive soil, the route is located in II5 area, and the design elevation of the roadbed is 243.50m; It is sandy soil, the filling height is assumed to be 2m, and the groundwater level is 7.5m below the road surface, so the critical height of the subgrade is H=7.5m. According to H>H1=1.5m, the wet and dry type of the subgrade is dry. By looking up the table, it can be seen that Wc is greater than 1.04 and Wc=1.05; the soil foundation rebound modulus E 0 = 35MPa.

[0080] According to JTG D50-2006 "Code for Design of Highway Asphalt Pavement" and considering that the road is located in a hilly area, the pavement structure layer is made of asphalt concrete 10cm, the base layer is made of two-layer crushed stone concrete, and the subbase layer is made of flyash soil. A two-layer asphalt ...

example 2

[0108] Project overview: The road to be designed is a secondary road, the route is located in the plain area, and the natural division of the road is II2 area; the soil along the line is medium-liquid-limited cohesive soil, the height of the filled embankment is 0.6 meters, and the groundwater level is 2.7m from the surface of the road bed, which belongs to the medium Wet state; the average annual rainfall is 660mm, the average maximum temperature in July is 29°C, and the annual extreme minimum temperature is -34°C.

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Abstract

The invention discloses a simplified calculation method for the structural layer resilience modulus of a road with four structural layers. The roadbed of the four structural layers has a middle surface, and the position of the middle surface is calculated according to the fact that the sum of internal stresses acting on the cross-section of the roadbed of the four structural layers is zero. Z c ; Then calculate the equivalent elastic modulus E of the four-layer subgrade according to the value of the mid-surface ff , where h is the total thickness of the four-layer subgrade, and the calculation formula of K is as follows: where, E 1 ,E 2 E. 3 and E 4 are the elastic modulus of the first, second, third and fourth layer respectively, h 1 、h 2 、h 3 and h 4 Respectively the thickness of the first, second, third and fourth layers; based on the simplified calculation method of the elastic modulus of each structural layer of the secondary road in the present invention, each structural layer is directly simplified, and then the equivalent springback is obtained Modulus; directly calculate the deflection; the calculation amount is small, the steps are simplified, and the calculation efficiency is greatly improved; at the same time, it is closer to the actual situation of the road surface, and the result is more accurate.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a simplified calculation method for the elastic modulus of structural layers of a road with four structural layers. Background technique [0002] The modulus of resilience refers to the ratio of the stress generated by the subgrade, pavement and road construction materials under load to the corresponding rebound strain. ability. It is an important mechanical parameter of pavement design in our country, and directly affects the selection of other parameters and the result of structural design. In the design of pavement structure, the design deflection of each structural layer must be calculated according to the test rebound deflection value of each structural layer, and the total deflection of the pavement surface must be calculated according to the deflection of each structural layer. Deflection is the vertical deformation of the subgrade or pavement under ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/15G06F30/20G06F119/14
CPCG06F2119/06G06F30/20
Inventor 周博丁龙亭张梦媛付林杰
Owner CHANGAN UNIV
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