Method for correcting parameters of Duncan-Chang model of soil body under complex stress condition

By conducting experiments under real three-axis conditions, the influence of the main stress on the strength parameters of the loess body was explored, and it was introduced into the Duncan-Zhang model, which solved the problem of tangent deformation modulus error caused by the influence of the main stress in the model, and improved the accuracy of the prediction.

CN119691849AInactive Publication Date: 2025-03-25CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD +1
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Patent Information

Application Number
CN202411654507.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-19
Publication Date
2025-03-25
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing Duncan-Zhang model fails to consider the influence of the medium principal stress, resulting in a large error in the predicted tangent deformation modulus.

Method used

By conducting natural loess consolidation drainage shear test under true three-axis conditions, the strength and deformation characteristics of the complex stress state of loess body are revealed. Starting from the friction angle of the strength parameters of the material under true three-axis stress, the influence of the main stress on the strength parameters is explored, and based on the generalized Hooke's law, it is introduced into the Duncan-Zhang E-B model parameters to correct the deformation modulus parameters.

Benefits of technology

It improves the accuracy of the predicted tangent deformation modulus, solves the error problem caused by the failure of the existing model to consider the influence of the main stress, and provides more accurate parameter support for engineering.

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Abstract

The invention discloses a Duncan-Chang model parameter correction method for a soil body under a complex stress condition, and belongs to the technical field of water conservancy and hydropower engineering informatization system construction.The Duncan-Chang model parameter correction method comprises the steps that S1, according to different strength criteria, cohesive force expressions under different stress states are obtained; and S2, based on an incremental generalized Hooke's law, considering deformation generated by the effect of small principal stress difference in large principal strain superposition of the Duncan-Tensile model under the influence of medium principal stress, introducing stress state parameters, and correcting deformation modulus parameters. A natural loess consolidation drainage shear test is carried out under the true triaxial condition, the strength and deformation characteristics of a loess body in a complex stress state are revealed, the influence rule of principal stress on strength parameters is discussed from the strength parameter internal friction angle of a material under the true triaxial stress, and the stability of the loess consolidation drainage shear test is improved. The problem that the predicted tangent deformation modulus error is large due to the fact that an existing Duncan-Chang model does not consider the influence of the principal stress is solved, and the accuracy of the predicted tangent deformation modulus is improved.
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