Construction method of rock structural plane damage statistical constitutive model considering size effect

A constitutive model and size effect technology, applied in calculation, computer aided design, design optimization/simulation, etc., can solve the problems that the size effect mechanism and expression form have not been fully explained

Pending Publication Date: 2019-08-16
CENT SOUTH UNIV
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Problems solved by technology

These research results have promoted the understanding of the shear size effect of structural planes. However, due to the complex mechanical behavior of rock materials, the mechanism and manifestation of the size effect have not been fully elucidated. Looking at the existing shear constitutive models, few A model wi

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  • Construction method of rock structural plane damage statistical constitutive model considering size effect
  • Construction method of rock structural plane damage statistical constitutive model considering size effect
  • Construction method of rock structural plane damage statistical constitutive model considering size effect

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Embodiment Construction

[0050] The construction method of the damage statistical constitutive model of the rock structural plane considering the size effect disclosed in this embodiment includes the following steps:

[0051] Step 1. Since the thickness of the structural plane is extremely thin compared to the thickness of the rock walls on both sides during the shearing process, in order to facilitate the research, the structural plane is simplified to an equivalent thin layer with a finite small thickness. The simplified ideal structural plane damage model Schematic such as figure 1 As shown, the thin layer includes N mesoscopic microelements that can reflect various properties of the material. During the shearing process, the microscopic microelements are damaged, and the number of damaged microscopic microelements is recorded as N f , then the damage variable is recorded as:

[0052]

[0053] Step 2. Based on the statistical distribution of rock material strength, the failure probability densi...

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Abstract

The invention discloses a construction method of a rock structural plane damage statistical constitutive model considering a size effect, which comprises the following steps of: firstly, simplifying astructural plane into an equivalent thin layer, and determining damage variables according to the number of damaged mesoscopic microelements and the total number of the mesoscopic microelements in the thin layer; secondly, obtaining a damage probability density function of the mesoscopic unit body; then, determining a reasonable damage initial stage, simulating the structural plane load condition, and obtaining a statistical damage constitutive model of the structural plane under the shearing effect; secondly, according to stress balance in the shearing process, determining the relation amongnominal shearing stress, effective shearing stress borne by the undamaged infinitesimal body and shearing stress borne by the damaged infinitesimal body, and obtaining a damage evolution model and astructural surface shearing deformation damage constitutive model of the structural surface in the shearing deformation process; determining parameters m and u0 of the structural plane shear deformation damage constitutive model, and establishing a structural plane shear constitutive model considering the size effect based on the nonlinear relationship between the parameters and the size; finallyverifying the correctness.

Description

technical field [0001] The invention belongs to the research field of constitutive models of rock structural planes, and in particular relates to a construction method of a damage statistical constitutive model of rock structural planes considering size effects. Background technique [0002] The existence of structural planes is the root of the difference between rock mass media and other media, and it is also an important factor affecting the mechanical properties of rock mass. Establishing a shear constitutive model that can accurately simulate the whole process of shear deformation and failure has always been a hot spot in rock mechanics research. Since the 1960s, many scholars have carried out research work and established many structural surface constitutive models. Representative ones include: pure linear elastic constitutive models such as Goodman model, Saeb-Amadei model; nonlinear models such as Barton-Bandis model, Grasselli model, CSDS model; elastic-plastic incr...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2119/06G06F30/20Y02T90/00
Inventor 林杭谢世杰杨横涛陈怡帆汪亦显邹平
Owner CENT SOUTH UNIV
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