Hollow inclusion crustal stress measurement self-sealing multi-aperture universal high pressure confining pressure rate meter

Abstract

The invention provides a hollow inclusion crustal stress measurement self-sealing multi-aperture universal high pressure confining pressure calibration instrument, and belongs to the technical field of rock strength measurement. The high pressure confining pressure calibration instrument cabin of the high pressure confining pressure calibration instrument is provided with an oil inlet, an exhaust port and an oil pressure gauge, both ends of the cabin are provided with cabin covers with different diameters, cabin cover plates are matched according to rock core sizes, a back double groove universal self-sealing high strength polyurethane rubber leather sheath is arranged in the cabin, hydraulic oil is fully filled between the leather sheath and the high pressure confining pressure calibration instrument cabin, and a test rock sample is put and extruded into the back double groove universal self-sealing high strength polyurethane rubber leather sheath. The whole system adopts a hydraulic oil self sealing principle, the cabin cover plates are matched according to the rock core sizes, the oil inlet is connected with a high pressure hand pump by a high pressure oil pipe, the rubber leather sheath is adopted to realize stable loading of confining pressure 80MPa, and the confining pressure in the high pressure confining pressure calibration instrument can be in real time monitored. The high pressure confining pressure calibration instrument can simulate the crustal stress in a deep rock mass and monitor deformation before the rock sample is loaded and destroyed, the operation is simple, and the confining pressure is stable.

Description

technical field [0001] The invention relates to the technical field of rock strength measurement, in particular to a self-sealing multi-diameter general-purpose high-pressure confining pressure calibrator for measuring hollow inclusion ground stress. Background technique [0002] In-situ stress measurement is a necessary prerequisite for scientific excavation design and decision-making in geotechnical engineering. Confining pressure calibration is an indoor calibration test of the hollow inclusion ground stress measurement method, which is used to determine the deformation parameters of the rock core obtained through the indirect method of ground stress measurement, and then deduce the stress. The shallow ground stress measurement is based on the theory of linear elasticity, and the confining pressure ratio is used to determine the constant deformation parameters of the rock. However, when entering the deep part, the rock and rock mass show obvious nonlinear deformation cha...

AI Technical Summary

Problems solved by technology

[0004] Since the pressure-bearing rubber sleeve of the existing confining pressure constant (biaxial pressure system) equipment is fixed on the pressure-bearing cylinder through the sealing ring, the deformation of the leather sleeve is controlled by the cylinder clamp and oil pressure, and stress will be generated at the corners Concentrate and affect the rise of the overall pressure of the system

In addition, the outer diameter of the on-site stress-relieving core will vary greatly due to the difference in rock type, drilling pressure, and drill bit performance. Under the condition of fixed elongation, a single device cannot meet the requirements of multi-caliber core testing.

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