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In-situ stress test method for soft rock with multi-measuring points using sensing column

A testing method and sensing column technology, applied in soil material testing, material inspection products, etc., can solve problems such as inability to realize complete grouting of the whole hole section, and achieve stress values ​​at test points, easy calculation, and grouting The effect of short setting time

Inactive Publication Date: 2015-11-11
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multi-test point measurement needs to install multiple sensor groups in the hole (one test point needs to contain two three-way pressure sensors), and there may be occlusion between them, and it is impossible to achieve complete grouting of the entire hole section

Method used

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  • In-situ stress test method for soft rock with multi-measuring points using sensing column
  • In-situ stress test method for soft rock with multi-measuring points using sensing column
  • In-situ stress test method for soft rock with multi-measuring points using sensing column

Examples

Experimental program
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Effect test

Embodiment 1

[0049] For soft rocks in coal-measure strata with a depth of 800 to 1000 meters, first make the corresponding stress sensing column 1, use the mold, and use the C2.5 grade cement mortar to wrap the two cube-shaped three-way pressure boxes 2 and 3 to form a cement A mortar cylinder with a diameter of about 120mm and a data line hole 5 on the side surface. The centers of the three-way pressure sensors 2 and 3 are both on the central axis of the stress sensing column 1 (cylindrical cement mortar body). The central axis of one end of the three-way pressure box 2 and 3 leads from the stress sensing column 1 forms a cylindrical groove during pouring, with a depth of 8 cm and the same diameter as the outer diameter of the push rod 7 . A cross bar made of stainless steel is fixed along the diameter of the cylinder in the groove, which becomes a connecting piece corresponding to the push rod 7 . The stress sensing column 1 is cured by adding water to 50% of the standard strength, and ...

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Abstract

The invention discloses a detection method for soft rock multi-point ground stress by adopting sensing columns. According to the invention, the relative positions of a pair of three-dimensional pressure sensors are fixed by the sensing columns; one measuring point corresponds to one sensing column; in the sending process, relative movement between the two three-dimensional pressure sensors can be prevented; the diameter of each stress sensing column is only slightly smaller than that of a drill hole, so that only a small amount of grouting is required to enable the stress of the soft rock to be transferred to the sensors; the depth and the rotation angle of each sensor can be obtained accurately; the ground stress value at the testing point can be obtained accurately through numerical calculation of drill hole sectional mechanics, and the regional ground stress field can be obtained through inversion. The method can monitor the stress evolution process of multiple measuring points inside a surrounding rock, so that the research on ground stress of a coal mine and other deep soft rocks, as well as the stability of a surrounding rock, is facilitated.

Description

technical field [0001] The invention belongs to the technical field of geotechnical measurement, and in particular relates to an in-situ stress testing method which adopts a sensing column and is suitable for multiple measuring points in deep soft rock. Background technique [0002] With the increase of mining depth, the safe construction of coal mine roadway is increasingly inseparable from the effective monitoring of the ground stress of the surrounding rock of the roadway. In the deep broken and weak surrounding rocks of coal mines, it is very difficult to effectively test the in-situ stress with the commonly used testing methods. Taking the hydraulic fracturing method widely used in hard rock as an example, the borehole packer needs to have good water tightness under high water pressure, which puts strict requirements on the integrity of the rock mass, especially not suitable for Broken and weak rock mass developed with deep joints and fissures in the coal mine. Anothe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
Inventor 刘小燕刘泉声张程远蒋景东
Owner WUHAN UNIV
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