Method of estimating dynamic elastic modulus of subgrade soil based on state variable and stress variable

A technology of dynamic resilience modulus and state variables, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that the state variables of subgrade soil, stress variables and physical properties of subgrade soil cannot be considered at the same time, and the estimation is inaccurate. The effect of reducing test volume, high accuracy, and reducing test difficulty

Active Publication Date: 2019-01-04
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for estimating the dynamic modulus of resilience of subgrade soil based on state variables and stress variables, which solves the problem th

Method used

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  • Method of estimating dynamic elastic modulus of subgrade soil based on state variable and stress variable
  • Method of estimating dynamic elastic modulus of subgrade soil based on state variable and stress variable
  • Method of estimating dynamic elastic modulus of subgrade soil based on state variable and stress variable

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Embodiment 1

[0052] The specific implementation process of the present invention is demonstrated with sandy low liquid limit clay, and Table 2 is a statistical table of physical property indicators of sandy low liquid limit clay.

[0053] Table 2 Statistical table of physical property indexes of sandy low liquid limit clay

[0054]

[0055] Step a: Make test pieces under 85%, 90%, 95%, and 100% compaction, and measure the matrix suction value of each test piece with a pressure plate meter. The test results are as follows: image 3 shown;

[0056] Using the Fredlund and Xing model, as shown in formula (2), the soil-water characteristic curve of sandy low liquid limit clay is established, and the model parameters under different compaction degrees are obtained, as shown in Table 3;

[0057]

[0058] where: θ w is the volume moisture content; θ s is the saturated volumetric moisture content; a f , b f , c f and h r is the Fredlund and Xing model parameter, a f is the air intake ...

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Abstract

The invention discloses a method of estimating dynamic elastic modulus of subgrade soil based on state variable and stress variable. The method includes: using a pressure plate instrument to measure matrix suction of the subgrade soil, and establishing a soil-water characteristic curve to obtain model parameters under different compactness degrees; using a dynamic triaxial instrument to perform dynamic elastic modulus test of subgrade soil to obtain dynamic elastic modulus value of the subgrade soil; establishing a subgrade soil dynamic elastic modulus estimation model based on a state variable and a strain variable; establishing a relational equation between estimation model parameters and subgrade soil physical property indexes. The problem is solved that existing methods of estimating elastic modulus give no consideration to subgrade soil state variable, strain variable, and subgrade soil physical properties.

Description

technical field [0001] The invention belongs to the technical field of road engineering, in particular to a method for estimating the dynamic resilience modulus of subgrade soil based on state variables and stress variables. 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 traffic 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 provides three methods for determining the dynamic modulus of resilience. [0003] The first is the look-up table method, but the suggested elastic modulus of each soil quality varies widely, and it is impossible to accurately find the dynamic elastic modulus value of a given soil quality through the table. [0004] The second method is to calcul...

Claims

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Application Information

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IPC IPC(8): G01N3/52
CPCG01N3/52G01N2203/0083G01N2203/0218
Inventor 张军辉彭俊辉李崛黎峰
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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