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A three-dimensional ground stress measurement device with split petals close to the hole wall

A measuring device and ground stress technology, which is applied in the field of measuring ground stress, can solve the problems of over-thick colloid, misalignment of enclave and borehole axis, misalignment, etc., and achieve the effect of improving accuracy

Active Publication Date: 2018-05-04
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Comprehensive analysis and comparison of the above patents lead to the following conclusions: ①The enclave does not coincide with the axis of the borehole, that is, it is out of axis; ②The colloid is too thick. For example, CNIO4280417A uses cement to couple the borehole wall. The cracking of the colloid will directly affect the measurement accuracy; ③The gap between the inclusion wall and the hole wall is coupled together through the colloid, and the change of the elastic mode of the colloid will also affect the measurement accuracy

Method used

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  • A three-dimensional ground stress measurement device with split petals close to the hole wall
  • A three-dimensional ground stress measurement device with split petals close to the hole wall
  • A three-dimensional ground stress measurement device with split petals close to the hole wall

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Embodiment Construction

[0026] A three-dimensional geostress measurement device of the present invention with split petals close to the hole wall will be described in detail below in conjunction with the accompanying drawings.

[0027] See attached figure 1, taking a borehole 10 with a diameter of 54mm as an example, a split-valve type three-dimensional geostress measuring device close to the hole wall, the device is composed of a rigidly connected straight casing 1, a rigid connecting rod 2, and multiple groups of isolated resin shell valves 4. Multiple sets of strain gauges 5, tail cone 6, orifice propulsion valve 7, reverse arc bottom V-shaped steel sheet groove 8, variable diameter rigid sleeve 3, strip-shaped synthetic rubber block 9, strip-shaped colloid capsule 10, reverse The arc bottom V-shaped steel sheet groove 8 is composed; the rigid connecting rod 2 is a hollow pipe body, which is composed of multi-section pipe body threaded connections, its outer diameter is 16mm, and its inner diamete...

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Abstract

The invention relates to a segmented hole wall attaching type three-dimensional geostress measurement device.A resin wrapping body is optimized in a segmenting mode, resin shell segments radially move to be closely attached to the hole wall, and therefore the influence of elastic modulus changes of a colloid can be ignored; the phenomenon that influences are generated to a measurement result due to the fact that the cured colloid is cracked under the high stress action is avoided; the coaxial problem is solved while the resin shell segments radially move to be closely attached to the hole wall, and the measurement precision is improved.The device can be widely applied to geostress measurement of rock mass engineering such as mines, water conservancy and hydropower, transportation tunnels.

Description

technical field [0001] The invention relates to the technical field of measuring geostress, in particular to a three-dimensional geostress measuring device with split petals close to the hole wall. Background technique [0002] In-situ stress is the fundamental force that causes deformation of surrounding rock in mining engineering and induces rock burst phenomena. Accurate in-situ stress measurement data is a necessary prerequisite for scientific decision-making and mining engineering design. With the continuous development of mining, the influence of in-situ stress will become more serious. Ignoring the influence of in-situ stress and blindly constructing mining will seriously threaten the safe production of mines. Only by knowing the ground stress state of the mine can we take reasonable and effective preventive measures to prevent the surrounding rock deformation, rock burst and other disaster phenomena, which is of great significance to the stability of the roadway and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/08
CPCG01L1/08
Inventor 陆银龙张晓东孟星宇王连国王凯李文帅张凯文王斌
Owner CHINA UNIV OF MINING & TECH
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