Inner-outer frame combined variable stiffness rock mechanical testing machine and method

Abstract

The invention provides an inner-outer frame combined variable stiffness rock mechanical testing machine and method, and relates to the technical field of rock mechanics. The machine comprises a stiffness regulation device, a test loading device, a monitoring system and a control system. The stiffness regulation device comprises an outer frame top beam, an outer stand column, a stiffness regulationoil cylinder and a base, the loading oil cylinder of the test loading device loads and drives the inner top frame to rise so as to extend and deform the inner stand column and compress and deform a high-pressure spring; for the same test sample, in the set loaded load value condition, the loaded load of the stiffness regulation oil cylinder is increased, the displacement of the inner top beam andthe deformation of the inner stand column are reduced, and the loading stiffness is increased; when test is performed, according to the monitoring data of the displacement sensor, the control systemcontrols the load of the stiffness regulation oil cylinder to achieve the real-time control of displacement of the inner top beam so as to ensure that the loading stiffness in the whole test process meets a design value and is unchanged, solve the technical problem that the rock mechanical testing machine loading stiffness cannot be subjected to quantitative regulation and have the simple operation.

Description

technical field [0001] The invention relates to the technical field of rock mechanics, in particular to a combined internal and external frame variable stiffness rock mechanics testing machine, a method for adjusting the loading stiffness of the device, and a method for performing rock mechanics tests using the device. Background technique [0002] Rock mechanics test is the main technical means to obtain stratum property parameters in underground engineering such as geotechnical engineering, mining, tunnel construction, etc. In 1970, Salamon first comprehensively discussed the influence of different testing machine stiffness on rock deformation characteristics, and proposed to use a testing machine with higher stiffness to reduce the additional energy acting on the rock, and then obtain the stress-strain after the peak stress curve. This point of view was later confirmed by researchers and engineers engaged in rock mechanics in rock mechanical tests, so as to obtain the fu...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the loading stiffness cannot be quantitatively adjusted in the rock mechanics test, the present invention provides a combined internal and external frame variable stiffness rock mechanics testing machine and testing method, and the specific technical scheme is as follows:

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