High-pressure servo dynamic true triaxial testing machine

Abstract

The invention discloses a high-pressure servo dynamic true triaxial testing machine. A main machine consists of three sets of loading/unloading systems which are independent from one another, including two sets of vertical loading/unloading systems and a set of horizontal loading/unloading system which are all high-rigidity loading/unloading frames. The testing machine is a comprehensive type rigidity testing machine which can perform multiple tests such as simple single-shaft tension, compression and shearing tests, ordinary triaxial tests and true triaxial tests, moreover the testing machine can provide pressure which is large enough to meet experiment requirements of materials such as most rock, static load and disturbance load can be independently exerted to a rock sample test piece in three directions which are perpendicular to one another in a three-dimensional space, and the load can be rapidly unloaded in a single side. In addition, all operation is accomplished by a computer keyboard and a mouse, and meanwhile a necessary manual control device is provided, so that the testing machine has the characteristics of convenience and flexibility in operation.

Description

technical field [0001] The invention relates to the research fields of rock mechanics and rock engineering, in particular to a true triaxial rockburst experimental device for simulating a disturbed excavation state of rock mass, in particular to a high-voltage servo dynamic true triaxial testing machine. Background technique [0002] A lot of research work has been done at home and abroad on the mechanical experiments of rockburst, from uniaxial compression test, biaxial loading test, conventional triaxial test to true triaxial test. The axial loading test does not conform to the three-dimensional state where the actual rockburst occurs, and the conventional triaxial test is an ideal axisymmetric state, which cannot truly reflect the strength parameters of the rock in engineering practice, so only the true triaxial test can be used to simulate the rockburst However, the current true triaxial test is characterized by insufficient stiffness or inability to disturb or unload qu...

AI Technical Summary

Problems solved by technology

[0002] A lot of research work has been done at home and abroad on the mechanical experiments of rockburst, from uniaxial compression test, biaxial loading test, conventional triaxial test to true triaxial test. The axial loading test does not conform to the three-dimensional state where the actual rockburst occurs, and the conventional triaxial test is an ideal axisymmetric state, which cannot truly reflect the strength parameters of the rock in engineering practice, so only the true triaxial test can be used to simulate the rockburst However, the current true triaxial test is characterized by insufficient stiffness or inability to disturb or unload quickly. The testing machine cannot have the above three functions at the same time. Insufficient stiffness will cause the pressure plate to store and release energy during the experiment and cannot be disturbed. It is impossible to reproduce the impact of excavation or other vibrations on the rock mass, and it cannot be quickly unloaded. It is difficult to analyze the relationship between the rapid excavation of the rock mass and the occurrence of rockburst. In short, if the above three conditions are not met at the same time , cannot accurately simulate the rockburst experiment

[0003] The current true triaxial testing machine can only do single experiments such as simple tensile test and conventional triaxial test, but it cannot do tensile, compression, shear, conventional triaxial and true triaxial tests at the same time. Different tests require different testing machines, which cost a lot

[0004] At present, the true triaxial rockburst experiment needs to add strain gauges to the rock sample, and then calculate the ultimate strength, elastic modulus, Poisson's ratio and other rock mechanical parameters of the rock sample through artificial analysis and calculation. The experimental process is cumbersome and complicated.

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