Device and method for testing plane stress state of coal rock sheet under thermal-mechanical coupling condition

A thermal-mechanical coupling, test device technology, applied in the direction of applying stable tension/compression to test the strength of materials

Active Publication Date: 2016-03-23
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the rock mechanics test of coal and rock mass tends to be true triaxial simulation macroscopically, but the three-dimensional crack evolution law inside the coal rock under the true triaxial condition has not yet been visualized. The coal-rock thin-plate device can realize the visual monitoring of the two-dimensional

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  • Device and method for testing plane stress state of coal rock sheet under thermal-mechanical coupling condition
  • Device and method for testing plane stress state of coal rock sheet under thermal-mechanical coupling condition

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specific Embodiment approach

[0038] detailed description: According to the requirements of the experiment, there are two options for the size specification of the coal-rock thin plate specimen 8, namely: 200×200×20mm or 300×300×20mm. The test device can meet the thermal-mechanical coupling test requirements of the coal-rock thin plate test piece 8 under the plane stress state.

[0039] Axial strain restraint system 1 mainly provides longitudinal restraint for coal and rock thin plate specimen 8 to ensure that it is in a plane stress state; plane loading system 2 mainly provides plane stress load for coal and rock thin plate specimen 8; bottom temperature control and support adjustment The component system 3 mainly provides temperature control for the coal and rock thin plate test piece 8 and adjusts the balance of the supporting platform; the acoustic emission monitoring system 4 mainly uses the acoustic emission instrument to monitor the acoustic emission events of the coal and rock thin plate test piec...

Embodiment approach 1

[0041] In this implementation example, a 300×300×20mm coal rock thin plate specimen is taken as an example. Under the condition of a fixed temperature of 100°C, a thermal-mechanical coupling test under plane stress loading was carried out.

[0042] Adopting the experimental method of the coal rock thin plate plane stress state test device under the described thermomechanical coupling condition, comprises the following steps:

[0043] Step 1: Before the experiment, it is first required to adjust the support adjustment assembly at the bottom of the flat thin plate device to a horizontal state;

[0044] Step 2: Put the 300×300×20mm coal and rock thin plate test piece 8 into the pressure chamber, and apply low prestress to the test piece in both directions to fasten the test piece at the same time, and at the same time pass the axial high temperature and high pressure transparent The cover plate 9 imposes longitudinal displacement constraints on it;

[0045] Step 3: Connect each m...

Embodiment approach 2

[0049] In this implementation example, a 200×200×20mm coal rock thin plate specimen is taken as an example. Under the condition of fixed plane stress, respectively 3MPa and 5MPa, temperature loading thermomechanical coupling test, the temperature loading gradient is 20°C, keep the constant temperature for 15 minutes and then raise the temperature to the next gradient.

[0050] Adopting the experimental method of the coal rock thin plate plane stress state test device under the described thermomechanical coupling condition, comprises the following steps:

[0051] Step 1: Before the experiment, it is first required to adjust the support adjustment assembly at the bottom of the flat thin plate device to a horizontal state;

[0052] Step 2: Put the 200×200×20mm coal and rock thin plate test piece 8 into the pressure chamber, and apply low prestress to the test piece in both directions to fasten the test piece at the same time, and at the same time pass the axial high temperature a...

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Abstract

The invention provides a device and method for testing a coal rock plane sheet under the thermal-mechanical coupling condition and belongs to the technical field of rock mass mechanics and engineering. The device is characterized in that the device is composed of an axial stress restraint system 1, a plane loading system 2, a bottom temperature control and supporting adjusting assembly system 3, an acoustic emission monitoring system 4, a visual monitoring system 5 and a stress-deformation testing system 6; the mechanics characteristic test of a coal rock plane coal rock sheet test piece in the plane stress state under the thermal-mechanical coupling condition can be stimulated, crack initiation and extension characteristics of cracks of the plane coal rock sheet test piece under the thermal-mechanical coupling condition are monitored in the whole course and formation and extension mechanisms of the cracks under the thermal-mechanical coupling condition are observed, analyzed and grasped through the acoustic emission monitoring system 4, the visual monitoring system 5 and the stress-deformation testing system, and the theoretic foundation and the experimental basis are provided for fracturing of the plane coal rock sheet test piece under the thermal-mechanical coupling condition.

Description

technical field [0001] The invention discloses a test device and a test method for the plane stress state of a thin coal-rock plate under thermal-mechanical coupling conditions, belonging to the field of rock mechanics and engineering technology. In particular, it relates to a test device and a test method for realizing thermal-mechanical coupling of a coal rock sheet material in a state of plane stress on a true three-axis servo pressure testing machine. Through thermal coupling rock mechanics tests on coal and rock thin plate specimens, the stress-strain and other rock mechanical properties and their changing laws of coal and rock thin plate materials in a plane stress state under different stress and temperature conditions are revealed; through horizontal two-way loading, the plane The crack initiation and propagation process of the coal and rock thin plate specimen under the stress state; the heating of the coal and rock thin plate specimen is controlled by the bottom temp...

Claims

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Application Information

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IPC IPC(8): G01N3/18
CPCG01N3/18
Inventor 梁卫国武鹏飞杨晓琴曹孟涛王志勇
Owner TAIYUAN UNIV OF TECH
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