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Static cracking agent expansion pressure test device and method

A technology of static breaking agent and testing device, which is applied in the field of geotechnical engineering, can solve problems such as large errors and inability to measure, and achieve the effect of eliminating interference, simple test device, and strong operability

Active Publication Date: 2018-06-12
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This measurement method also has the following disadvantages: first, this method can only obtain the axial expansion pressure produced by the static breaking agent after the hydration reaction occurs, and cannot measure the radial expansion pressure produced by it on the side wall of the tube , and the real rock-breaking effect is generally the radial expansion pressure
Second, because the loading method of the upper pressure testing machine is to drive the pressure head of the lower pressure testing machine through hydraulic oil, so that the pressure head is close to the upper piston, but the axial expansion pressure generated by the hydration reaction of the static breaking agent cannot fully compress the pressure. The hydraulic oil in the oil cylinder of the test machine pushes and flows in the reverse direction, so the reading changes observed by the upper displacement sensor cannot fully infer the axial expansion pressure
[0005] In summary, there will be a large error between the expansion pressure generated by the hydration reaction of the static breaking agent calculated by the existing technology and the real value, so a set of specific test methods and testing devices for the expansion pressure of the static breaking agent are proposed , which has important theoretical and practical significance for perfecting the theory of static crushing and rock breaking technology

Method used

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  • Static cracking agent expansion pressure test device and method
  • Static cracking agent expansion pressure test device and method
  • Static cracking agent expansion pressure test device and method

Examples

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Effect test

Embodiment 1

[0042] This embodiment provides a test device for static breaker expansion pressure, such as Figure 1 to Figure 4As shown, it includes the first limit plate 1, the second limit plate 2, the measuring rod 3, the resistance strain gauge 4, the test cylinder, the first limit rod 5, the second limit rod 6, and the resistance strain gauge 4 The resistance strain gauge 8 that is connected by wire 7 and the computer 9 that is electrically connected with resistance strain gauge 8; The first limiting plate 1 is fixed on the platform, and is oppositely arranged with the second limiting plate 2; Measuring bar 3 comprises smooth section and Threaded section 10; the end of smooth section is fixedly arranged on the first limiting plate 1; threaded section 10 passes through the second limiting plate 2 and is provided with a limiting nut 11 over the second limiting plate 2; A measuring section 12 is arranged on the smooth section between the position plate 1 and the second limit plate 2; the...

Embodiment 2

[0051] This embodiment provides a test method for static breaker expansion pressure, which is implemented based on the test device for static breaker expansion pressure described in Example 1, according to the expansion of static breaker hydration reaction The transmission path of the pressure is to measure the strain characteristics of the measuring section 12 through the resistance strain gauge 4, thereby calculating the size of the expansion pressure generated by the breaking agent, including the following steps:

[0052] Step 1: coupling the first half cylinder 13 and the second half cylinder 14 to form a test cylinder;

[0053] Step 2: Fix the first semi-cylinder 13 through the arc splint 15 on the first limit rod 5;

[0054] Step 3: Rotate the limit nut 11 to adjust the second limit plate 2 to move toward the second half-cylinder 14 until the second end of the second limit rod 6 abuts against the outer wall of the second half-cylinder 14;

[0055] Step 4: Polish the mea...

Embodiment 3

[0069] This embodiment takes the measurement of the expansion pressure when the mass ratio of the static breaking agent to water (water-cement ratio) is 7:3 as an example, and its specific implementation is as follows.

[0070] 1. Device construction size and processing requirements:

[0071] (1) The first semi-cylinder 13 and the second semi-cylinder 14 are semicircular thin-walled steel cylinders: radius 30mm, wall thickness 4mm, height 500mm, upper and lower bottom seals; the cut surface should be flat and smooth, and the two steel cylinders can be neatly stitched along the cut surface , there is no obvious gap and staggered seam phenomenon, and the leakage of the steel cylinder can be observed by pouring water before the test;

[0072] (2) The diameter of the grouting hole 16 on the first half cylinder 13 should be 10mm~15mm, and the diameter of the vent hole 17 on the second half cylinder 14 should be 5mm~10mm, which is convenient for grouting and hole sealing;

[0073] ...

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Abstract

The invention provides a static cracking agent expansion pressure test device and method, which belongs to the technical field of geotechnical engineering. A first limiting plate in the device is fixed on a platform and is opposite to a second limiting plate. A measuring rod comprises a smooth section and a threaded section. The end part of the smooth section is fixedly arranged on the first limiting plate. The threaded section passes through the second limiting plate, and a limiting nut is arranged on the sheath of the second limiting plate. A measurement section is arranged on the smooth section between the first limiting plate and the second limiting plate. A resistance strain gauge is pasted on the measurement section. A test cylinder is formed by coupling and splicing a first semi-cylinder and a second semi-cylinder in opposite joint. The first end of a first limiting rod is fixed on the first limiting plate, and the second end is provided with an arc splint. The first end of a second limiting rod is fixed on a second limiting plate, and the second end abuts against the outer wall of the second semi-cylinder. According to the invention, the influence of sensitive factors on the true value of expansion pressure is weakened, and the measurement accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a test device and method for static breaking agent expansion pressure. Background technique [0002] Static breaking agent is a kind of high expansibility powdered rock-cracking material widely used in the field of geotechnical engineering at present. It is mixed with water and undergoes hydration exothermic reaction, and the volume expansion occurs in a short period of time. A larger expansion pressure is generated in the space. Taking drilling and charging rock breaking as an example, when the expansion pressure acting on the hole wall causes the concentrated tensile stress inside the rock to exceed its tensile strength, the cracks that open radially along the hole wall gradually expand, eventually causing rock cracking and damage. This is the rock-breaking mechanism of the static breaking agent, and the expansion pressure generated by it will directly determi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/00
CPCG01L5/00
Inventor 郝兵元黄小朋张鹏鹏任兴云李彦生钱翰飞
Owner TAIYUAN UNIV OF TECH
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