True 3D primary rock stress relief method based measurement device with spherical inclusion and measurement method

Abstract

The invention discloses a true 3D primary rock stress relief method based measurement device with a spherical inclusion and a measurement method. The measurement device comprises a strain sphere and apropeller connected with the strain sphere, wherein the strain sphere is spherical, and a plurality of strain gauges and a plurality of small adhesive discharge holes are arranged on the peripheral wall of the strain sphere; the propeller comprises a piston, a casing and adhesive discharging directional holes, a hollow cavity is formed in the casing, one end of the piston is in sliding fit with the hollow cavity, the other end is connected with a mounting rod, the adhesive discharging directional holes are formed in the casing and communicates the hollow cavity with an adhesive guiding channel, and an adhesive is injected into the hollow cavity. With the adoption of rigid design and true 3D distribution of the strain gauges, a heterogeneous true 3D primary rock stress test for rock in a complicated stress environment is realized, a true 3D geostress measurement technology is perfected, and a new thought is provided for the field of primary rock stress measurement and a true primary rock stress field is provided for big data analysis and operation.

Description

technical field [0001] The invention belongs to the technical field of raw rock stress measurement in rock mechanics, and is applied to the raw rock stress measurement engineering of underground mines, underground power stations, dams, tunnels and large-section underground projects, and specifically relates to a spherical inclusion The real three-dimensional original rock stress relief method measuring device and measuring method. Background technique [0002] With the advancement of science and technology and the use of mechanized equipment, the speed of underground engineering construction, dam body, tunnel and slope excavation has increased significantly compared with the past, but the technology in the measurement of original rock stress is far behind. Due to the essential force of underground engineering and dam failure, and subject to measurement conditions and expensive test costs, many projects are basically converted from vertical stress and lateral pressure coeffic...

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Problems solved by technology

[0002] With the advancement of science and technology and the use of mechanized equipment, the speed of underground engineering construction, dam body, tunnel and slope excavation has increased significantly compared with the past, but the technology in the measurement of original rock stress is far behind. The essential force of underground engineering and dam failure, and subject to measurement conditions and expensive test costs, many projects are basically converted from vertical stress and lateral pressure coefficient

The traditional three-axis proto-rock stress measurement device for hollow inclusions adopts a cylindrical design, with three sets of stress flowers arranged at an angle of 120 degrees to each other, consisting of a total of 12 stress sheets. From the design point of view, it is difficult to achieve true three-dimensional From the analysis of the three-dimensional force situation, some strain gauges are not perpendicular to the force, so that the stress gauges in the same orientation will be stretched and compressed, resulting in a decrease in the accuracy of the measurement data

The hydraulic fracturing method is affected by the test environment and time, and it is difficult to perform its measurement work. At the same time, it is difficult to achieve true three-dimensional measurement work due to the heterogeneity of the rock mass.

[0003] In recent years, due to the establishment of big data centers and cloud computing platforms, the measurement data of the true three-dimensional in-situ stress field plays an important role in the calculation, but none of the existing measurement methods and technologies can realize true three-dimensional testing

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