Multifunctional true triaxial rock creepmeter

Abstract

The invention discloses a multifunctional true triaxial rock creepmeter, comprising a base, a test piece mounting base arranged on the base, two groups of horizontal direction stress loading systems with the same structure, a vertical direction stress loading system and a creep data measuring system. The multifunctional true triaxial rock creepmeter disclosed by the invention can carry out a single-axis pulling and pressing creep test and also can carry out a true triaxial compression, pulling and pressing combined creep and unloading-creep test which simulates three-dimensional stress state and loading and unloading stress path of a natural geological rock mass and an engineering rock mass and maintain tension stress states in one or two directions unloaded to the rock; and test function is more comprehensive, practicability is stronger, and a pulling and pressing combined creep and stable pressing and pulling stress conversion unloading-creep test is realized; a pull pressure loading system can provide a pressure which is high enough to meet creep test requirements of most rock materials, and a long-term constant load can be provided; and the multifunctional true triaxial rock creepmeter disclosed by the invention has the characteristics of having a simpler structure, hardly consuming energy source in a test process and having low test cost.

Description

technical field [0001] The invention relates to an experimental instrument, in particular to a creep experimental device for uniaxial tension and compression, true triaxial compression, combination of tension and compression, and unloading-creep experiments on materials such as rocks and concrete. Background technique [0002] Creep is the most important form of material rheological effect, which refers to the phenomenon that the material deformation increases continuously with the growth of the specimen under the continuous action of constant stress. A large number of field tests and indoor tests show that construction and geotechnical engineering materials generally have certain creep properties. However, most engineering rock masses are often in a complex three-dimensional stress state, and the rheological research under the uniaxial stress state and single stress path cannot truly and accurately reflect the actual stress state of the engineering rock mass. Therefore, eng...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the triaxial compression creep test devices for rock and concrete materials use rigid hydraulic servo test machines for loading. Although these devices have superior performance in load amplitude control and data acquisition, they also have obvious disadvantages: 1. It cannot truly reflect the three-dimensional stress state of the engineering rock mass, which is a conventional triaxial stress state (the confining pressure is annular hydraulic loading, and the stress state around the specimen is completely consistent); second, not only the instrument cost is very high, but also the test process This kind of instrument consumes a lot of power, and the creep test takes a long time, so the test cost is also greatly increased; 3. The stability of the tension and pressure loaded by the servo system is not enough, resulting in insufficient test accuracy

On the other hand, the actual engineering rock mass may have strong differential springback deformation due to excavation and unloading (especially in a high-stress state), and the stress is redistributed. Composite or one-way or even two-way tensile stress state, and so far there is no experimental instrument that can achieve a smooth transition from a three-dimensional compressive stress state to a combined tension-compression or one-way or even two-way tensile stress state.

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