Method for determining 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 difficulty in predicting the shear strength of rock mass

Active Publication Date: 2020-04-10
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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  • Method for determining joint shear strength considering freeze-thaw cycle damage
  • Method for determining joint shear strength considering freeze-thaw cycle damage
  • Method for determining 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 provided by the invention deeply analyzes the relationship between the joint connectivity and the shear strength, and proposes a calculation formula of shear strength parameters changing along with the joint connectivity based on an indoor test, so that the shear strength of the complex joints can be conveniently and accurately calculated. According to the method, based on a freeze-thaw test and a direct shear testof a joint sample, a shear strength parameter damage evolution model is established; further an improved shear strength calculation formula is derived; according to the calculation formula, the damageaccumulation of freeze-thaw cycle and the influence of joint connectivity are considered at the same time; the degradation characteristics of the coupling effect of the freeze-thaw cycle and the joint connectivity on the shear strength parameters can be deeply analyzed, the high coincidence degree of the calculation result of the improved calculation formula and experimental data is obtained according to the subsequent test result, and the reasonability of the improvement criterion is shown.

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...

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Application Information

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Patent Type & Authority Applications(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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