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Zoned testing method for surrounding rock damage zone

A testing method and technology for surrounding rock, which are applied in the testing of basic structures, measuring devices, and earth-moving drilling and mining, etc., can solve problems such as difficulty in direct promotion, and achieve the effect of low technical threshold, avoiding incompatibility, and ensuring safe operation.

Inactive Publication Date: 2015-01-07
POWERCHINA HUADONG ENG COPORATION LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Although the damage degree can be analyzed and calculated theoretically, it is difficult to directly extend the results of theoretical calculations to field practice due to the complexity of rock mass conditions.

Method used

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  • Zoned testing method for surrounding rock damage zone

Examples

Experimental program
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Embodiment Construction

[0016] The specific implementation scheme of this embodiment is as follows:

[0017] The test hole 2 is arranged vertically to the excavated cavern 1, and the length of the test hole 2 is required to exceed 3 times the diameter D of the excavated cavern (see figure 1 ) to ensure a complete test of the influence range of the damaged area; the test hole 2 requires a cavity diameter D that is more than 3 times the distance from the face 21 to ensure that the influence of the face effect is eliminated; the diameter of the test hole 2 must reach 60mm The above is to ensure that the core can be drilled and processed into a standard rock sample of 100mm×50mm. Since the core in the damaged area is easily affected by the unloading effect during the sampling process, it is discrete or the core cake cannot take out a complete core, it is required to arrange at least 3 test holes (arranged along the axial direction of the cavern) , and the spacing is greater than the cavern diameter D. ...

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Abstract

The invention relates to a zoned testing method for surrounding rock damage zones and aims at providing a conveniently-operated, accurate and effective zoned testing method for the surrounding rock damage zones. The surrounding rock damage degree is judged through deformation modulus testing, and a damage zone partitioning limit is established. The technical scheme is that the zoned testing method for the surrounding rock damage zone is characterized in that a testing hole is formed and is perpendicular to an excavated grotto, a rock core is taken out of the testing hole, and the depth of the testing hole corresponding the rock core is recorded; a deformation modulus testing instrument is adopted to test the rock core and summarize deformation modulus testing results and performs tabulation statistics, a transverse shaft represents a distance away from the wall of the grotto, a longitudinal shaft represents deformation modulus, the testing results and original deformation modulus are compared, the testing results lower than the original deformation modulus in a table are damage zones, gentle sections lower than the original deformation modulus are internal damage zones, and rising sections are external damage zones. The zoned testing method for the surrounding rock damage zones is suitable for the field of underground engineering.

Description

technical field [0001] The invention relates to a method for testing surrounding rock damage zones. Applicable to the field of underground engineering. Background technique [0002] With the increase of buried depth of underground engineering, the contradiction between in-situ stress and strength of surrounding rock becomes more and more prominent, and the surrounding rock is inevitably damaged, forming excavation loss area. The existence of the damage zone will cause obvious changes in the internal structure, basic mechanical behavior and engineering response of the surrounding rock, which will greatly increase the difficulty of stability control and support of the project. [0003] Damage is different from fracture. Crack refers to the fracture surface that can be observed by naked eyes. Damage is generally difficult to be observed by naked eyes, but it will cause some permanent changes in the mechanical and hydraulic properties of the surrounding rock. These changes can ...

Claims

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Application Information

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IPC IPC(8): E02D33/00E21B25/10G01B21/32G06F19/00
CPCE02D33/00G01B21/32G16Z99/00
Inventor 刘宁张春生吴旭敏倪绍虎
Owner POWERCHINA HUADONG ENG COPORATION LTD
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