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A preparation method of a random crack test model

A technology of test models and cracks, which is applied in the preparation of rock mass mechanical properties test test models and the preparation of random crack test models, to achieve the effects of eliminating interference and influence, wide sources, and simple preparation methods

Inactive Publication Date: 2019-03-12
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem that the present invention needs to solve in order to realize the above object is how to randomly mix the fissure simulating material, that is, fissure fragments of different thicknesses, different sizes and different numbers, into the continuum model material, so as to simulate the random fracture rock mass Experiments have been made to effectively simulate the natural structural characteristics of rock mass fissures and joints, as well as the distribution of rock mass random structural characteristics and the complex mechanical environment of rock mass with good heterogeneity. Technical Problems of Stochastic Crack Test Models for Mass Properties

Method used

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  • A preparation method of a random crack test model
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The experimental method is as follows:

[0040] Take the geometric similarity ratio C l is 6, that is, the model size is 1.5m×1.5m×1.5m, according to the model volume ratio, the number of cracks in the test model is calculated to be about 18, the thickness of the crack fragments used is about 0.1mm, the size is less than 5mm, and the shape is approximately rectangular; Bulk density similarity ratio C γ Take it as 1.5, then the elastic modulus is similar to the ratio C E =C l ×C γ =9

[0041] According to the intensity similarity ratio C R =C E =C l ×C γ =9, calculate the bulk density, compressive strength and elastic modulus of the model under the corresponding ratio, and select different material ratios according to the calculated model strength value.

[0042] The aggregates are recrystallized powder and iron powder, and the cementing material is gypsum. The ratio and mechanical parameters are as follows:

[0043]

[0044] Mix the recrystallized powder, i...

Embodiment 2

[0053] Take the geometric similarity ratio C l is 9, that is, the size of the model is 2.25m×2.25m×2.25m. According to the model volume ratio, the number of cracks in the test model is calculated to be about 58. The thickness of the crack fragments used is about 0.1mm, the size is less than 5mm, and the shape is approximately rectangular; Bulk density similarity ratio C γ Take it as 1.5, then the elastic modulus is similar to the ratio C E =C l ×C γ =13.5

[0054] According to the intensity similarity ratio C R =C E =C l ×C γ =13.5, calculate the bulk density, compressive strength and elastic modulus of the model under the corresponding ratio, and select different material ratios according to the calculated model strength value.

[0055]

[0056] The aggregates are recrystallized powder and iron powder, and the cementing material is gypsum. The ratio and mechanical parameters are as follows:

[0057] Mix the recrystallized powder, iron powder and gypsum with water ...

Embodiment 3

[0066] Take the geometric similarity ratio C l is 14, that is, the size of the model is 3.5m×3.5m×3.5m. According to the model volume ratio, the number of cracks in the test model is calculated to be about 220. The thickness of the crack fragments used is about 0.1mm, the size is less than 5mm, and the shape is approximately rectangular; Bulk density similarity ratio C γ Take it as 1.5, then the elastic modulus is similar to the ratio C E =C l ×C γ =21

[0067] According to the intensity similarity ratio C R =C E =C l ×C γ =21, calculate the bulk density, compressive strength and elastic modulus of the model under the corresponding ratio, and select different material ratios according to the calculated model strength value.

[0068] The aggregates are recrystallized powder and iron powder, and the cementing material is gypsum. The ratio and mechanical parameters are as follows:

[0069]

[0070] Mix the recrystallized powder, iron powder and gypsum with water in th...

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Abstract

The invention discloses a preparation method of a random crack test model, which is to prepare a model capable of effectively simulating rock mass cracks and joints by randomly mixing crack fragments of different thicknesses, sizes and numbers into continuous medium body model materials. Natural structural characteristics, as well as the distribution of random structural characteristics of heterogeneous rock mass and the test model of heterogeneous characteristics of complex mechanical environment, in order to carry out the simulation test of random fractured rock mass. The model preparation process of the invention is simple and easy to operate. Compared with the prior art, the rock mass model prepared by it is closer to the engineering rock mass, and the test result is more consistent with the real situation of the rock mass. The preparation method of the random crack test model of the present invention can be applied to large-scale similar simulation tests, especially related to similar simulated mine pressure observation, heterogeneous rock layer fluid-solid coupling simulation experiment, broken coal and rock mass excavation simulation test, etc. Preparation of simulation test models with structural requirements, etc.

Description

technical field [0001] The invention relates to a method for preparing a test model for rock mass mechanical properties, in particular to a method for preparing a random crack test model, and belongs to the technical field of large-scale underground engineering simulation tests. Background technique [0002] Rock is a heterogeneous material with internal structure. Under the action of external force, the nucleation, expansion and interaction of micro-defects inside the rock determine the macroscopic deformation and failure characteristics of the rock. Although scholars have achieved many beneficial results in the study of rock fracture. However, these studies have always been carried out on the assumption of a homogeneous medium, and rarely involve rock damage caused by the heterogeneity of the rock itself. Due to the long-term effect of the tectonic stress field, the rock is not homogeneous, but a heterogeneous, anisotropic and discontinuous composite structure composed of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 马志涛陆通王永萍梁赛江高东川张云月徐汉文
Owner SHANDONG UNIV OF SCI & TECH
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