Rigid servo-actuated loading frame structure

Abstract

A rigid servo-actuated loading frame structure belongs to the technical field of a hard rock true triaxial test machine, and can be used as a basic loading frame structure of the hard rock true triaxial test machine. The rigid servo-actuated loading frame structure comprises a frame unit and a pneumatic hydraulic balancing unit, a horizontal frame in the frame unit is arranged above an upper supporting platform, and the horizontal frame and the upper supporting platform are in sliding fit; the upper supporting platform is fixed above a lower supporting platform, the lower supporting platform is fixed on the ground; a vertical frame is arranged above the lower supporting platform, the vertical frame and the upper supporting platform are connected by a support oil cylinder of a pneumatic hydraulic balance unit; the support oil cylinder is communicated with an energy accumulator, the energy accumulator is communicated with a nitrogen cylinder through an electronic pressure regulating valve, and an electronic pressure regulating valve signal control end is connected to a main control computer; by use of the hard rock true triaxial test machine, a servo-actuated mode of the vertical frame and the horizontal frame can realize that a geometrical center of a rock specimen is invariant, and the vertical frame and the horizontal frame are produced by a whole casting process, and can fully meet the needs of hard rock after-pick failures.

Description

technical field [0001] The invention belongs to the technical field of hard rock true triaxial testing machines, in particular to a rigid follow-up loading frame structure that can be used as the basic loading frame structure of hard rock true triaxial testing machines. Background technique [0002] For the field of deep rock mass engineering at this stage, such as mining and hydropower chamber engineering, due to the influence of excavation, the stress state in the near field of the roadway changes in the true triaxial stress space, and the indoor mechanical test under the true triaxial condition of hard rock is carried out It can better study the mechanical behavior of the actual deep rock mass stress field. [0003] The various loading frame structures adopted by the existing hard rock true triaxial testing machines cannot realize the invariance of the geometric center of the rock sample during the test, because the rock sample will be compressed and deformed during the l...

AI Technical Summary

Problems solved by technology

[0003] The various loading frame structures adopted by the existing hard rock true triaxial testing machines cannot realize the invariance of the geometric center of the rock sample during the test, because the rock sample will be compressed and deformed during the loading process, and then The geometric center of the rock sample is offset, and the existing hard rock true triaxial testing machine cannot effectively eliminate the offset, so that the problem of how to realize the geometric center of the rock sample is still unsolved

[0004] According to the conventional design idea, relevant technicians may choose to use two actuator units on the same loading shaft system for loading. First, this design idea will greatly increase the manufacturing cost of the hard rock true triaxial testing machine. Secondly, In order to ensure that the loading force of the two actuators remains consistent, the controller units of the two actuators need to be precisely designed, but there is no ready-made solution to solve the control problem of the actuators, so this Design ideas are also difficult to implement, and even if implemented, the cost will be very high

[0005] In addition, the various loading frame structures adopted by the hard rock true triaxial testing machines at the present stage generally use low-rigidity tie rods or column frame structures, but the traditional loading frame structures are faced with several When the loading force is 100 tons, it cannot meet the needs of hard rock post-peak failure at all. The post-peak failure of hard rock will directly lead to the failure of the test and the serious distortion of the test results, and it cannot provide a theoretical basis for the actual deep rock stress research.

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