Miniature built-in cantilever beam type displacement gage used for geomechanics model experiment

Abstract

The invention relates to a micro-built-in cantilever beam type displacement meter used for a geomechanics model test, and the micro-built-in cantilever beam type displacement meter comprises a spring leaf, a steel wire rope and a strain gauge, etc., the both ends of the steel wire rope are respectively connected with the upper end of the spring leaf and an internal measuring point of a model; and a regulating screw bolt is arranged on the upper end of the spring leaf. The lower end of the spring leaf is fixed on a thick steel bar, the strain gauge is arranged at the root which is near to the lower end of the spring leaf and is connected with a signal receiving and processing device by a signal line. The micro-built-in cantilever beam type displacement meter has the following advantages: (1) Small size and small occupying space. (2) High sensitivity. (3) Simple structure, convenient processing and low cost. (4) Adjustable property. (5) Being embedded in the model possibly. The displacement meter can be embedded in the model, and the measurement is carried out by leading out the signal line.

Description

technical field [0001] The invention relates to a displacement meter, in particular to a miniature built-in cantilever beam type displacement meter used for geomechanical model tests. Background technique [0002] The model test based on the similarity theory originated in the 17th century. After several centuries of development and improvement, it has achieved unprecedented development and wide application in the 1970s. Its application fields involve almost all disciplines of scientific research. The model test of underground caverns started at this period, mainly because the scale of some underground caverns in transportation, hydropower and other projects is getting larger and larger, and the stability of their surrounding rocks needs to be carefully studied. This need has strongly promoted the development of underground cavern model tests; in turn, underground cavern model tests have solved many problems that were difficult to solve in engineering practice at that time, ...

AI Technical Summary

Problems solved by technology

This kind of displacement meter can be buried inside the model, but since the displacement meter can only be buried near the measuring point, and the fixed pile is used for displacement transmission, this greatly destroys the model material around the measuring point and hinders the deformation of the model itself, so it cannot be applied Displacement measurement of side walls between multiple chambers

[0007] (5) At present, the length of sensors produced and sold by various domestic factories is generally greater than 6 cm, and the diameter is large, so it is difficult to bury them in the small space inside the model

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