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Preparation method for random crack test model

A test model and fissure technology, which is used in the preparation of rock mass mechanical property test test models and the preparation of random crack test models, to achieve the effects of wide sources, test results conforming to the real situation of rock mass, and easy acquisition.

Inactive Publication Date: 2014-03-26
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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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

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Experimental program
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Embodiment 1

[0039] The experimental method is as follows:

[0040] Take the geometric similarity ratio C l is 6, that is, the size of the model is 1.5m×1.5m×1.5m. According to the volume ratio of the model, 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; Density similarity ratio C γ Take it as 1.5, then the elastic modulus similarity 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] Recrystallized powder and iron powder are selected as the aggregate, and the cementing material is gypsum. The ratio and mechanical parameters are as follows:

[0043]

[0044] Add water to recrys...

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 volume ratio of the model, 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; Density similarity ratio C γ Take it as 1.5, then the elastic modulus similarity 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 choose different material ratios according to the calculated model strength value.

[0055] Recrystallized powder and iron powder are selected as the aggregate, and the cementing material is gypsum. The ratio and mechanical parameters are as follows:

[0056] Mix the recrystallized powder, iron powder and gypsum with water in t...

Embodiment 3

[0065] 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 volume ratio of the model, 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; Density similarity ratio C γ Take it as 1.5, then the elastic modulus similarity ratio C E =C l ×C γ =21

[0066] 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.

[0067] Recrystallized powder and iron powder are selected as the aggregate, and the cementing material is gypsum. The ratio and mechanical parameters are as follows:

[0068]

[0069] Mix the recrystallized powder, iron powder and gypsum with water...

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Abstract

The invention discloses a preparation method for a random crack test model. Different quantities of crack fragments with different thicknesses and different sizes are randomly doped into a continuous dielectric body model material, so that a test model capable of effectively simulating natural structural features such as cracks and joints of a rock body as well as the random structure feature distribution and a complicated dynamic environment of a rock body with a heterogeneity characteristic can be prepared, and a simulation test on the random crack rock body can be carried out. The model preparation process is simple and easy to operate; compared with the prior art, the preparation method has the advantages that the prepared rock body model is closer to an engineering rock body, and a test result is fitter to a real condition of the rock body. The preparation method for the random crack test model is applicable to large-size similar simulation tests and particularly relates to preparation of simulation test models which are used for similar simulation ore pressure observation, heterogeneous rock layer fluid and solid coupling simulation test, crushed coal rock body exploration simulation test and the like and have requirements on the structures of rock layers.

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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IPC IPC(8): G01N1/28
Inventor 高东川马志涛高东忍李瑞瑞张云月张孝强刘慧洁郭峰陈宗泰冯宜语
Owner SHANDONG UNIV OF SCI & TECH
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