Servo controlled rock fracture shear seepage test sealing device

A technology of rock fissure and sealing device, applied in the field of rock mechanics, can solve the problems of discontinuous shearing process and unstable sealing, and achieve good sealing effect and the effect of continuous shear-seepage test

Pending Publication Date: 2017-11-24
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of unstable seal and discontinuous shear process in the existing rock shear-seepage test, the present invention provides a sealing device for rock fissure shear seepage test with stable seal and continuous shear process controll

Method used

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  • Servo controlled rock fracture shear seepage test sealing device
  • Servo controlled rock fracture shear seepage test sealing device
  • Servo controlled rock fracture shear seepage test sealing device

Examples

Experimental program
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Effect test

example 1

[0047] Example 1. Precise control of normal stress. The normal jack is equipped with a pressure sensor, and the load applied by the jack can be controlled by the servo during the test. Let σ 1 is the normal stress borne by the specimen, A 1 is the area of ​​the specimen subjected to the normal force; σ 2 is the normal stress applied to the jack, A 2 is the sectional area of ​​the normal jack piston; σ 3 is the stress acting on the piston of the vertical sealing device, A 3 is the cross-sectional area of ​​the piston of the vertical sealing device. Then there is σ 1 A 1 = σ 2 A 2 -σ 3 A 3 . The magnitude of the force acting on the piston in the normal jack and the vertical sealing device can be precisely controlled by the servo controller to ensure that the normal stress acting on the sample remains stable at the set value.

example 2

[0048] Example 2. Treatment of dilation. During the shearing process, the crack will undergo shear expansion, so that the upper and lower parts will gradually open. If a mechanical and fixed sealing device is used, the sealing performance will gradually deteriorate and even water leakage will occur as the cracks open. The servo control system in the present invention can make a comprehensive judgment based on the data of the displacement sensor and the oil pressure data in the vertical sealing device, and automatically compensate the reduction of the oil pressure caused by dilatation to ensure the stability of the seal.

example 3

[0049] Example 3. Variable water pressure test. When performing seepage tests, it is generally necessary to change the water pressure and conduct a series of tests under water pressure. The servo control system in the present invention can monitor the change of water pressure, and automatically adjust the oil pressure in the sealing system, so that the oil pressure is always greater than the water pressure, so as to achieve a good sealing effect.

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PUM

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Abstract

The invention relates to a servo controlled rock fracture shear seepage test sealing device, which includes a shear apparatus for shearing rock fracture test pieces and a seepage apparatus for controlling fluid flow. The shear apparatus consists of a normal compression plate, an upper shear box, a lower shear box, a pedestal, upper pressing blocks and lower pressing blocks, a rock fracture test piece is fixed at a test station between the upper shear box and the lower shear box, the upper part of the upper shear box is connected to the normal compression plate, the lower shear box is connected to the pedestal, the upper pressing blocks are respectively located on both sides at the lower part of the upper shear box, the lower pressing blocks are respectively located on both sides at the upper part of the lower shear box, and the lower pressing blocks are located right above the lower pressing blocks. The sealing device also includes a vertical seal apparatus for sealing a fracture end perpendicular to the shear direction, a horizontal seal apparatus for sealing a fracture end parallel to the shear direction, and a servo control system for controlling oil pressure. The servo controlled sealing device for rock fracture shear seepage test provided by the invention has the characteristics of stable sealing and continuous shear process.

Description

technical field [0001] The invention belongs to the field of rock mechanics, and relates to a sealing device in a rock fissure shear seepage test, in particular to a seepage sealing device capable of continuous shearing under servo control and considering real characteristics of rock such as rock shear dilatation. Background technique [0002] The shear-seepage characteristics of rock fissures are of great research significance in some major geological disasters, such as landslides and earthquakes, or in some large-scale underground rock mass engineering, such as nuclear waste disposal and oil mining. Carrying out experimental research on the shear-seepage characteristics of rock fractures in the laboratory can help us deeply understand the various behaviors of fractures under hydraulic coupling, and provide basic data support for practical engineering applications. [0003] At present, a large number of experimental studies have been carried out on the shear-seepage charact...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N3/24
CPCG01N3/24G01N15/082G01N2203/0025
Inventor 李博邹良超周楷峰金栋黄嘉伦杜时贵钟振
Owner SHAOXING UNIVERSITY
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