Creep impact coupling and loading device

Abstract

The invention belongs to the field of geotechnical engineering and relates to a creep impact coupling and loading device. The creep impact coupling and loading device mainly comprises falling rings, a guide rail, a connecting rod, a hammer rod, pendulum bobs, an electro-hydraulic servo actuator, an electro-hydraulic servo actuator pressure head and a steel column. The creep impact coupling and loading device is characterized in that the electro-hydraulic servo actuator is arranged at the bottom of the device; the electro-hydraulic servo actuator pressure head is connected with a lower disk and can extend and retract to apply axial pressure; and the steel column at the upper part of the disk is fixed. Two holes are symmetrically formed in two sides of each falling ring, so that the falling holes can freely fall on the guide rail; the outer diameters of the falling rings is smaller than the diameter of an upper disk, so that the condition that a circular ring can completely fall to the disk is ensured; and the guide rail is detachable to replace the falling rings of different sizes. A form of combining hemisphere with a cylinder is adopted as the shape of each pendulum bob, one side of the hemisphere is close to a test specimen and one side of the cylinder is connected with one end of the hammer rod, and the hammer rod is detachable to replace the pendulum bobs of different sizes; and the other end of the hammer rod is fixedly connected with the circular ring, the ring sleeves the connecting rod of a clamping groove and the hammer rod can make the pendulum bobs to swing back and forth by virtue of the circular ring. Application of an impact load in the rock creep process can be achieved.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a creep impact coupling loading device. Background technique [0002] Rocks not only undergo elastic deformation and plastic deformation, but also have rheological properties. Creep is a kind of rheology, which refers to the phenomenon that deformation increases with time under the condition of constant stress. As one of the basic characteristics of rock mechanics, rock creep has a significant impact on the long-term stability and safety of actual engineering. The instability and failure of rock mass engineering are closely related to time, which has long been proved by a large number of engineering examples and experimental research. , therefore, it is essential to conduct creep tests on local rocks before actual engineering. [0003] At present, the research on rock creep properties at home and abroad often ignores the interaction between creep and other factors, which ...

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Problems solved by technology

[0004] However, most of the existing creep testing machines cannot apply impact loads when the test force is automatically applied, which directly limits the research on the creep properties of rocks under impact loads.

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