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Dynamic subgrade soil resilience modulus prediction method based on matric suction and minimum body stress

A technology of matrix suction and resilience modulus, which is applied in measuring devices, instruments, scientific instruments, etc., can solve the influence of the resilience modulus of subgrade soil moisture state that cannot be directly reflected, and restrict the estimation method of subgrade soil resilience modulus. problems such as promotion and application, difficulty in obtaining parameters, etc., to achieve the effect of easy promotion and application, simple structure and clear physical meaning

Active Publication Date: 2018-08-03
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Although the NCHRP 1-28A three-parameter model has the characteristics of less model parameters and strong adaptability to different soil properties, the model cannot directly reflect the influence of the moisture state and stress state of the subgrade soil on the elastic modulus
[0006] At present, many scholars at home and abroad have established some estimation models for the elastic modulus that directly reflect the moisture state and stress state of the subgrade soil, but either the models are complex and the parameters are difficult to obtain; or special test equipment is required
These all restrict the promotion and application of the proposed method for predicting the elastic modulus of subgrade soil.
In addition, there are still some shortcomings in the selection of stress state, which needs further optimization

Method used

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  • Dynamic subgrade soil resilience modulus prediction method based on matric suction and minimum body stress
  • Dynamic subgrade soil resilience modulus prediction method based on matric suction and minimum body stress
  • Dynamic subgrade soil resilience modulus prediction method based on matric suction and minimum body stress

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Embodiment 1

[0055] 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.

[0056] Table 2 Statistical table of basic physical parameters of high liquid limit clay

[0057]

[0058] Step a: Make test pieces under 90%, 93%, and 96% 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.

[0059] The Fredlund and Xing model (as shown in formula (3)) was used to establish the soil-water characteristic curve of high liquid limit clay, and the model parameters under different compaction degrees were obtained, as shown in Table 3.

[0060]

[0061] where: θ w is the volume moisture content; θ s is the saturated volumetric water content; h is the matric suction; a f , b f , c f and h r is the model parameter.

[0062] Table 3 Fredlund and Xing model parameters

[0063] ...

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Abstract

The invention discloses a dynamic subgrade soil resilience modulus prediction method based on matric suction and minimum body stress. The dynamic subgrade soil resilience modulus prediction method comprises: determining the matric suction of subgrade soil by using a pressure plate meter, and establishing a soil water characteristic curve to obtain model parameters under different compactness degrees; carrying out resilience modulus test by using a dynamic triaxial tester to obtain a subgrade soil resilience modulus value; establishing the logarithmic function relationshio equation between thesubgrade soil matric suction and the resilience modulus; and finally providing the dynamic subgrade soil resilience modulus prediction method based on the matric suction, the minimum body stress and the octahedron shear stress. With the method of the present invention, the humidity state and the stress state of the subgrade soil can be simultaneously considered, the established prediction model has clear physical meaning and simple structure, the parameters of the model can be determined by using the conventional dynamic triaxial tester, and the method is suitable for promotion application.

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 matrix suction and minimum body stress. 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 modulus of resilience. [0003] The first is the look-up table method, but the suggested elastic modulus of each soil quality varies in a wide range, and it is impossible to accurately look up the elastic modulus value of a given soil quality through the table. [0004] The second method is to calculat...

Claims

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Application Information

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IPC IPC(8): G01N3/52
CPCG01N3/52G01N2203/0083G01N2203/0218
Inventor 张军辉彭俊辉郑健龙
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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