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A Determination Method of Joint Shear Strength Considering Freeze-Thaw Cycle Damage

A freeze-thaw cycle and shear strength technology, applied in the engineering field, can solve problems such as rock mass shear strength is difficult to predict, and achieve the effect of improving rationality

Active Publication Date: 2022-04-29
CENT SOUTH UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for determining the shear strength of joints considering freeze-thaw cycle damage, and to solve the problem of multi-joint and freeze-thaw cycle damage in existing geotechnical engineering in cold regions, and the technology that rock mass shear strength is difficult to predict difficulty

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  • A Determination Method of Joint Shear Strength Considering Freeze-Thaw Cycle Damage

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Embodiment

[0065] According to an embodiment of the present application, according to the results of the freeze-thaw test and the direct shear test, the joint shear strength criterion considering freeze-thaw cycle damage is derived, including:

[0066] S1. According to the relationship between the change of the connectivity rate of the joint sample and the shear strength parameter, a calculation formula is constructed;

[0067] S2. According to the classic damage formula proposed by Lemaitre, define the cohesion force and internal friction angle damage variable D c and And calculate the cohesion and internal friction angle damage variable D of joint samples with different connectivity rates after freezing and thawing c and Then, taking the strength before the freeze-thaw cycle as the initial strength state, and taking the freeze-thaw cycle as the damage state, combined with the theory of damage mechanics and the Mohr-Coulomb criterion, the shear strength τ of the joint sample after t...

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Abstract

The invention discloses a method for determining joint shear strength considering freeze-thaw cycle damage. Aiming at the complexity of rock mass joints in cold regions, the method of the invention deeply analyzes the relationship between joint connectivity ratio and shear strength, and proposes based on laboratory tests The calculation formula of the shear strength parameter changing with the joint connectivity ratio is convenient for accurate calculation of the shear strength of complex joints. Based on the freeze-thaw test and direct shear test of joint samples, the present invention establishes a shear strength parameter damage evolution model, and further derives an improved shear strength calculation formula, which takes into account the damage accumulation and joint damage of freeze-thaw cycles at the same time. The influence of the connectivity rate can deeply analyze the degradation characteristics of the shear strength parameters due to the coupling effect of the freeze-thaw cycle and the joint connectivity rate. According to the follow-up test results, the calculation results of the improved calculation formula are in good agreement with the experimental data, which shows that Improve the rationale for the guidelines.

Description

technical field [0001] The invention belongs to the technical field of engineering, and in particular relates to a method for determining joint shear strength considering freeze-thaw cycle damage. Background technique [0002] The joints existing in natural rock mass cause degradation phenomena such as rock microscopic damage, frost heave fragmentation, and failure instability under the action of freeze-thaw cycles, which is considered to be one of the main reasons for inducing geological disasters in cold regions. Under the action of alternating temperature, the moisture stored in the joints will experience the freezing and thawing process, and the periodic frost heaving force generated by freezing and thawing will cause the joint fissures to expand continuously, and finally lead to the instability of the rock mass. At present, many scholars have carried out a lot of theoretical exploration and experimental research on this. On the one hand, it is to consider the effect of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24G01N3/06
CPCG01N3/24G01N3/06G01N2203/0218G01N2203/0298G01N2203/0676
Inventor 林杭雷大星谢世杰陈怡帆曹日红杨横涛汪亦显杜时贵
Owner CENT SOUTH UNIV
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