Earth stress measurement strain gauge
A stress measurement and strain gauge technology, applied in the measurement, measuring device, instrument and other directions of elastic deformation force by measuring the gauge, can solve the problems affecting the accuracy and precision of in-situ stress measurement, and achieve the effect of ensuring accuracy and precision.
Active Publication Date: 2021-07-23
INST OF GEOMECHANICS
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Problems solved by technology
If the strain gauge cannot be fully bonded and coupled with the borehole wall, it will seriously affect the accuracy and precision of ground stress measurement
Method used
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[0025] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them.
[0026] The components of the embodiments of the invention generally described and shown in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention.
[0027] Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] In the description of the present invention, it should be noted that the...
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The present application relates to the technical field of earth stress measurement equipment, in particular to a strain gauge for earth stress measurement. The ground stress measurement strain gauge includes a cylinder with strain gauges on the outer wall and a piston rod inserted into the cylinder at one end, a first seal is provided on the side wall of the rear end of the cylinder, and a second seal is provided on the guide part of the piston rod , the strain gauge is sealed against the hole wall of the small hole through the first seal and the second seal; a first flow channel is provided in the cylinder wall of the cylinder, and a second flow channel is provided in the guide part, and the strain gauge is pushed into During the process of the small hole, the air in the small hole can be discharged from the first flow channel and the second flow channel, so that the strain gauge can be put into the small hole without damaging the sealing performance of the first seal and the second seal ; and prevent the leakage of the adhesive, so that the strain gauge can be fully coupled with the hole wall of the small hole, thereby ensuring the accuracy and precision of the ground stress measurement.
Description
technical field [0001] The present application relates to the technical field of earth stress measurement equipment, in particular to a strain gauge for earth stress measurement. Background technique [0002] At present, in various underground projects such as mine roadways, traffic tunnels, water conservancy and hydropower stations, etc., when measuring the ground stress, the hollow inclusion stress relief method in the sleeve core stress relief method recommended by the International Society of Rock Mechanics is usually used. This method requires the use of hollow inclusion strain gauges to measure the ground stress. The hollow inclusion strain gauge consists of an epoxy resin cylinder with strain gauges and a plunger. The cylinder is filled with adhesive; during the measurement process, the hollow inclusion strain gauge is pushed into the small hole in the rock, and the After pushing the strain gauge into the bottom of the hole, continue to push the cylinder, the adhesiv...
Claims
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IPC IPC(8): G01B21/32G01L1/04
CPCG01B21/32G01L1/04
Inventor 张士安吴满路张重远
Owner INST OF GEOMECHANICS