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

A model test and geomechanics technology, applied in the field of displacement meter, can solve the problems of damage to the model material around the measuring point, inability to use the displacement measurement of the side wall, difficult to bury the inside of the model, etc., to achieve sensitive displacement, small footprint, and small damage Effect

Inactive Publication Date: 2009-01-14
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
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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 its

Method used

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

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[0024] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0025] The design principle of the utility model is as follows:

[0026] 1. Principle of cantilever beam elastic element

[0027] Such as image 3 As shown, the arm length of the cantilever beam AB is l, the B end is fixed, the free end A has a force F, and the strain gauge is attached to the upper surface of the beam at point C. The distance between points A and C is a. The cross section is rectangular, the thickness is h, and the width is b. Strain gauges are attached to point C on the material surface, and the distance between points A and C is a. The cross section is rectangular, the thickness is h, and the width is b. From the mechanics of materials, the relationship between the deflection f at point A and the strain ε at point C is:

[0028] ε=3hmf / 2l 2

[0029] In the formula, the unit of length is millimeter, then m=a / l.

[0030] Differentiate the above form...

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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, ...

Claims

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Application Information

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IPC IPC(8): G01B7/02G01B7/16G01L1/00
Inventor 朱维申孙林锋张乾兵李术才
Owner SHANDONG UNIV
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