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A double structural plane direct shear test method for studying the mechanism of sliding rockburst

A test method and structural surface technology, applied in the field of rock mechanics, can solve problems such as failure to reflect the conditions of rockburst occurrence, and achieve the effect of a reliable test method

Active Publication Date: 2018-10-23
NORTHEASTERN UNIV LIAONING
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  • Claims
  • Application Information

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Problems solved by technology

However, in real rock mass, structural planes often do not exist alone, especially in high-stress conditions, where structural planes are tightly occluded to generate huge shear resistance. The possibility of severe rockbursts due to fracture instability is greatly increased, and the commonly used single structural plane direct shear test method cannot reflect the occurrence conditions of such rockbursts

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  • A double structural plane direct shear test method for studying the mechanism of sliding rockburst
  • A double structural plane direct shear test method for studying the mechanism of sliding rockburst
  • A double structural plane direct shear test method for studying the mechanism of sliding rockburst

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Embodiment 1

[0034] The double structural plane direct shear test method for studying the mechanism of sliding rockburst is adopted for granite, including the following steps:

[0035] Step 1: making the granite into a rock sample with a square section, the size of which is 100mm×100mm×140mm (length×width×height);

[0036] Step 2: Sequentially generate double parallel structural planes on the granite sample under Brazilian splitting conditions, with a distance of 40 mm between the structural planes. At this time, the granite sample is divided into three pieces with thicknesses of 50 mm, 40 mm, and 50 mm, respectively, as figure 1 shown;

[0037] Step 3: Carry out 3D scanning on the double-parallel structural planes respectively to obtain a three-dimensional digital model of the double-parallel structural planes, figure 2 A 3D digital model of the upper structural face of the double parallel structural face is provided, in figure 2 Cut 10 section lines at equal intervals along the shear...

Embodiment 2

[0051] The double structural plane direct shear test method for studying the mechanism of sliding rockburst is adopted for granite, including the following steps:

[0052] Step 1: Make the granite into a rock sample with a square section, the size is 100mm×100mm×140mm (length*width*height);

[0053] Step 2: Sequentially generate double parallel structural planes on the granite sample under Brazilian splitting conditions, with a distance of 40 mm between the structural planes. At this time, the granite sample is divided into three pieces, with thicknesses of 50 mm, 40 mm, and 50 mm;

[0054] Step 3: Carry out 3D scanning on the double-parallel structural planes respectively to obtain a three-dimensional digital model of the double-parallel structural planes, Figure 10 A 3D digital model of the upper structural face of the double parallel structural face is provided, in Figure 10 Cut 10 section lines at equal intervals along the shearing direction, the interval between sectio...

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Abstract

The invention provides a double-structural surface direct shear test method for researching sliding type rockburst mechanism. The method comprises the following steps: manufacturing a rock sample with a square cross section; successively forming double parallel structural surface by the rock sample under a brazilian split condition; performing 3D scanning on the double parallel structural surface, thereby acquiring a three-dimensional digital model of the double parallel structural surface and calculating roughness thereof; putting the rock sample onto a shear tester, mounting an acoustic emission monitoring probe on the bottom lateral surface, and performing direct shear test on the sample under normal stress condition while monitoring an acoustic emission signal of the rock test piece; collecting the shearing time, shearing stress, shearing displacement and acoustic emission signal data in the shear test process; accordingly analyzing the sliding type rockburst mechanism of the rock sample. According to the invention, a simplified rock system with mutual effect and mutual influence of structural surface and rock is constructed in a laboratory, so that a more reliable test method can be supplied for researching, early warning for and forecasting the sliding type rockburst mechanism.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics, and in particular relates to a double structural plane direct shear test method for studying the mechanism of sliding rockburst. Background technique [0002] Worldwide, with the continuous expansion of rock engineering such as mining, hydraulic power, transportation, nuclear waste disposal, and military defense, the in-situ stress is gradually increasing, and the problem of rockbursts has become increasingly prominent. Generally speaking, rockburst is a dynamic failure phenomenon of surrounding rock caused by excavation and unloading of underground engineering rock mass under high ground stress state of hard rock. The occurrence of rockburst disasters affects the progress of the project, increases the cost of the project, and even causes catastrophic consequences such as equipment damage and casualties. [0003] Engineering practice shows that the shear slip of structural planes may indu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24G01N3/06G01N1/28
CPCG01N1/28G01N3/06G01N3/24
Inventor 刘溪鸽朱万成牛雷雷李如飞于庆磊张鹏海刘洪磊李帅
Owner NORTHEASTERN UNIV LIAONING
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