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Pre-estimation method for dynamic rebound modulus of subgrade soil

A technology of dynamic resilience modulus and resilience modulus, which is applied in the direction of testing material hardness, complex mathematical operations, etc., can solve the problem that the stress state of the subgrade soil, the suction force of the matrix and the physical properties of the subgrade soil cannot be considered at the same time.

Active Publication Date: 2017-01-11
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for predicting the dynamic modulus of resilience of subgrade soil, which solves the problem that the existing modulus of resilience estimation model cannot simultaneously consider the stress state of subgrade soil, matrix suction and physical properties of subgrade soil

Method used

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  • Pre-estimation method for dynamic rebound modulus of subgrade soil
  • Pre-estimation method for dynamic rebound modulus of subgrade soil
  • Pre-estimation method for dynamic rebound modulus of subgrade soil

Examples

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Embodiment 1

[0054] Example demonstrates the specific implementation process of the present invention with high liquid limit clay, and Table 2 is a statistical table of basic physical parameters.

[0055] Table 2 Statistical table of basic physical parameters of high liquid limit clay

[0056]

[0057] Step a: Make test pieces under 90%, 93% and 96% compaction, and measure the matric suction value of each test piece with a pressure plate meter. Test results such as figure 2 shown.

[0058] The Van Genuchten model (as shown in formula (3)) is used to establish the soil-water characteristic curve of high liquid limit clay, and the model parameters under different compaction degrees are obtained, as shown in Table 3

[0059]

[0060] where: θ s refers to the saturated volumetric water content, θ w refers to the volumetric water content, θ r refers to the residual volume moisture content, is the matrix suction, m 1 、m 2 and m 3 is the model parameter.

[0061] Table 3 Statist...

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Abstract

The invention discloses a pre-estimation method for a dynamic rebound modulus of subgrade soil. The pre-estimation method comprises the following steps: measuring matric suction of the subgrade soil by using a pressure plate extractor, and establishing a soil-water characteristic curve by adopting a Van Genuchten model; performing an rebound modulus test of the subgrade soil by using a dynamic triaxial apparatus, and obtaining a rebound modulus value; establishing a matric suction-rebound modulus relation equation; coupling the matric suction-rebound modulus relation equation with an NCHRP1-28A three-parameter model, and establishing a rebound modulus pre-estimation model for comprehensively considering the humidity and stress conditions of the subgrade soil; establishing a relation equation between model parameters and physical property indexes of the subgrade soil. The problem that an existing rebound modulus pre-estimation model cannot simultaneously consider the stress conditions of the subgrade soil, the matrix suction and physical properties of the subgrade soil is solved.

Description

technical field [0001] The invention belongs to the technical field of road engineering and relates to a method for estimating the dynamic resilience modulus of roadbed soil. Background technique [0002] As the stiffness parameter of subgrade soil in pavement design, the dynamic modulus of resilience reflects the stress-strain nonlinear characteristics of subgrade soil under the action of wheel load. my country's current "Code for Design of Highway Subgrade" (JTG D30-2015) regards the dynamic modulus of resilience as the stiffness parameter of the subgrade in pavement design, and gives some methods for determining the modulus of resilience, such as listing the rebound modulus under different soil properties. The modulus reference value and the rebound modulus value converted by CBR through the empirical formula, etc. But the value of its modulus does not take into account the embankment soil stress, matrix suction and physical property indexes of embankment soil. The resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/40G06F17/15
CPCG01N3/40G06F17/15
Inventor 张军辉陈英郑健龙戴良良
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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