Ground stress testing method based on rock core Kaiser effect

Abstract

The invention discloses a ground stress testing method based on rock core Kaiser effect. The method comprises the following steps of: drilling a plurality of rock core samples on a mother rock in theaxial direction of the mother rock core and in a plurality of directions perpendicular to the axial direction of the mother rock core; carrying out acoustic emission testing on each rock core sample,determining Kaiser effect points on the rock core samples through acoustic emission counting, acoustic emission counting accumulation and / or acoustic emission counting rate increment of the rock coresamples, and determining the stress of the Kaiser effect points on the rock core samples; based on the stress of the Kaiser effect points on the rock core samples, determining the maximum horizontal principal stress and the minimum horizontal principal stress of the mother rock and the included angle between the maximum horizontal principal stress and a marker line; and determining an azimuth angle of the maximum horizontal principal stress relative to a geographical north pole. The method is accurate and effective, improves the precision of the three-dimensional principal stress and directiontest of the coal measure strata, and provides basic reference data for mining area development and roadway arrangement.

Description

technical field [0001] The invention relates to another technology related to mining, in particular to an in-situ stress testing method based on the core Kaiser effect. Background technique [0002] In-situ stress testing is of great significance to the design and construction of underground projects such as mining and tunnel excavation. The main testing methods include hydraulic fracturing, stress relief and acoustic emission (AE) methods. The former two are rarely used in in-situ stress testing due to the disadvantages of difficult on-site construction, long test time, and high cost, while the AE method based on the Kaiser effect to measure in-situ stress has many advantages such as simplicity, speed, economy, and reliability, and It can be carried out in the laboratory and has been widely valued by the industry. [0003] In unmined areas of coal seams, many ground exploration drill holes are often arranged. Most of the drill holes are straight holes, and it is difficult ...

AI Technical Summary

Problems solved by technology

[0004]Based on this, it is necessary to provide a core-based Ground Stress Test Method of Kaiser Effect

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