In-situ stress testing method of method for relieving stress in original hole site for multiple times

Abstract

The invention discloses an in-situ stress testing method of a method for relieving stress in an original hole site for multiple times, and the method belongs to the field of in-situ stress testing. First, a location which has complete lithology and is suitable for in-situ stress testing is selected; a guide hole with the diameter being 127mm is drilled at the selected in-situ stress testing location, and the bottom of the hole is abraded; then a small hole with the diameter being 37mm is drilled, and the depth of the small hole is 300mm to 500mm; and a hollow inclusion is arranged in the small hole to relieve the stress and measure the in-situ stress for the first time; second, based on the measurement of the in-situ stress for the first time, an original drill bit continues to drill and core toward a deeper part along the original hole site, the in-situ stress is measured for multiple times continuously, and the multiple times of stress relieving depth intervals is 2m to 3m; and third, multiple times of in-situ stress testing results are compared and analyzed, the stress distribution area of in-situ rock is determined according to the change rules of the stress, and the distribution rules of the stress field of the in-situ rock are analyzed. The in-situ stress testing method of the method for relieving stress in the original hole site for multiple times has the advantages that the scientificalness and the truth of testing data are improved by measuring the in-situ stress values of the same hole site at different depths repeatedly for multiple times, so that re-drilling is prevented, and a complicated construction process is reduced.

Description

technical field [0001] The invention relates to an in-situ stress testing method of multiple stress relief methods at the original hole position, belonging to the field of in-situ stress testing. It can be generally applied to the test and research of in-situ stress at different depths in the surrounding rock of different roadways in the mine, and is especially suitable for the research on the distribution state of the original rock stress field in the deep part of the surrounding rock of the roadway. Background technique [0002] In-situ stress is the fundamental destructive force that causes deformation of various underground or open-pit rock and soil excavation projects such as mining, water conservancy and hydropower, civil engineering, military, railway and highway. The measurement of the in-situ stress of the original rock in the roadway is to determine the mechanical properties of the engineering rock mass and carry out surrounding Rock stability analysis is the funda...

AI Technical Summary

Problems solved by technology

[0004] However, the traditional casing stress relief method is a single drilling and single measurement. If the drilling is inaccurate, or the drilling has an inclination deviation, so that the hole and the aperture cannot be completely vertical, it will cause data errors, which is inevitable. The ground will cause adverse effects on the construction of the project and reduce the economic benefits of the project

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