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Triaxial rheological testing apparatus and testing method of electro-hydraulic servo rock

A three-axis rheological and electro-hydraulic servo technology, which is applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of lack of precision in controlling and stabilizing voltage, and achieve good stability, convenient disassembly, and stable loading.

Inactive Publication Date: 2013-01-23
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in view of the rheological characteristics of rocks under complex stress states, the high-rigidity loading frame for rheological tests is studied; especially for technical aspects such as axial force, high confining pressure and long-term pressure stabilization, such as limited bearing capacity, large deformation and environmental temperature changes At present, the accuracy of control voltage stabilization is still lacking. In the axial and confining pressure stabilization systems, servo controllers and computers are used to control the voltage stabilization system. There are unavoidable problems

Method used

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  • Triaxial rheological testing apparatus and testing method of electro-hydraulic servo rock
  • Triaxial rheological testing apparatus and testing method of electro-hydraulic servo rock
  • Triaxial rheological testing apparatus and testing method of electro-hydraulic servo rock

Examples

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Effect test

Embodiment 1

[0040] 1. Test conditions

[0041] The specimen is a cylindrical greenschist specimen with a diameter of 50 mm and a height of 100 mm. A triaxial rheological test scheme with stepwise loading of deviatoric stress was adopted. During the test, the confining pressure was unloaded step by step for 3 times, namely 40MPa, 30MPa and 20MPa.

[0042] 2. Test steps

[0043] a) Install the lifting device, track and trolley, and fix the pressure chamber seat on the trolley. Lift the pressure chamber chamber, install and fix the test piece, fix the axial and radial sensor elements on the test piece, connect the lead wires, then drop the pressure chamber outside the pressure chamber, and put on the clamp.

[0044] b) When starting the liquid-filled oil source pump, start the servo motor at the same time to retract the roller screw of the pressurized cylinder; when the piston of the pressurized cylinder returns to the set position, turn off the liquid-filled oil source oil pump, open the...

Embodiment 2

[0048] 1. Test conditions

[0049] The specimen is a cylindrical greenschist specimen with a diameter of 50 mm and a height of 100 mm. A triaxial rheological test scheme with stepwise loading of deviatoric stress was adopted. During the test, the confining pressure was unloaded in three stages, namely 15MPa, 10MPa, 5MPa, and 2MPa; the axial force was correspondingly 20MPa, 55MPa, 60MPa, 65MPa, 70MPa, etc.

[0050] 2. Test steps

[0051] a) Install the lifting device, track and trolley, and fix the pressure chamber seat on the trolley. Lift the pressure chamber chamber, install and fix the test piece, fix the axial and radial sensor elements on the test piece, and connect the lead wires; then drop the pressure chamber outside and put on the clamp.

[0052] b) When starting the liquid-filled oil source pump, start the servo motor at the same time to retract the roller screw of the pressurized cylinder; when the piston of the pressurized cylinder returns to the set position, t...

Embodiment 3

[0056] 1. Test conditions

[0057] The specimen is a cylindrical greenschist specimen with a diameter of 100 mm and a height of 200 mm. A triaxial rheological test program was adopted to keep the confining pressure 15MPa constant and load the deviatoric stress step by step. During the test, the axial stress was loaded in three stages, 25MPa, 30MPa, and 35MPa respectively.

[0058] 2. Test steps

[0059] a) Install the lifting device, track and trolley, and fix the pressure chamber seat on the trolley. Lift the pressure chamber chamber, install and fix the test piece, fix the axial and radial sensor elements on the test piece, and connect the lead wires; then drop the pressure chamber outside and put on the clamp.

[0060] b) When starting the liquid-filled oil source pump, start the servo motor at the same time to retract the roller screw of the pressurized cylinder; when the piston of the pressurized cylinder returns to the set position, turn off the liquid-filled oil sour...

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Abstract

The invention discloses a triaxial rheological testing apparatus and a testing method of an electro-hydraulic servo rock; an axial loading system is used for pressurizing an under cylinder; a cylinder piston component is used for pushing a test piece in a pressure chamber device to move upwards; a balance piston component is used for bearing an axial force, and transmitting a signal to an axial pressure controlling system by an axial force sensor; a confining pressure loading system is used for pressurizing a cylinder which is arranged in the pressure chamber device; a confining pressure sensor is used for transmitting a signal to a confining pressure controlling system; the axial pressure controlling system and the confining pressure controlling system are used for controlling axial pressure and confining pressure to be constant for a long time in a process of a rheological test; in the process, creep deformation occurs on the test piece, so that instant fluctuations of the axial pressure and the confining pressure can be caused; the axial force sensor and the confining pressure sensor can transmit signals to the axial pressure controlling system and the confining pressure controlling system at any time, and systems can respectively send instructions to start a servo motor depending on fluctuations of feedback signals, so as to control a roller screw rod to move forwards or backwards by a servo means; a pressurizing cylinder piston rod is moved, and the axial pressure and the confining pressure which are outputted by the pressurizing cylinder are respectively regulated; the testing apparatus is high in controlling pressure stabilizing precision and is capable of automatically stabilizing pressure for a long time.

Description

technical field [0001] The invention relates to a rock mechanical property test device, in particular to an electro-hydraulic servo rock triaxial rheological test device and a test method with relatively large axial load and high confining pressure. Background technique [0002] The number of deep underground projects that need to be built in the fields of water conservancy and hydropower, mining, transportation, etc. is increasing day by day. With the increase of depth, factors such as the increase of ground stress, the deterioration of geological conditions, the increase of broken rock mass, the increase of head pressure and water inflow, and the rise of ground temperature appear. In order to study the mechanical properties of deep engineering rock mass, especially under high stress conditions The most direct and economical way to determine the long-term strength and aging deformation characteristics of engineering rock mass is to carry out indoor rock triaxial rheological...

Claims

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Application Information

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IPC IPC(8): G01N3/12
Inventor 邬爱清周火明朱杰兵汪斌钟作武郝庆泽刘小红蒋昱州黄书岭
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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