Small-aperture 16-component conical strain gauge

Abstract

The invention discloses a small-aperture 16-component conical strain gauge comprising a strain head, a piston rod and a liquid storage cavity, wherein the upper end of the piston rod is provided witha positioning pin; the strain head comprises an aluminum cap, a glue hole, a strain gage, an adhesive groove, an adhesive retaining ring, a lead hole and a temporary fixing hole; the adhesive groove is arranged on the outer wall of the strain head, the strain gage is installed in the adhesive groove, the lead hole is arranged on the peripheral side of the strain head and communicates with the adhesive groove, the data line of the strain gage protrudes from the lead hole, the aluminum wire passes through a temporary fixing hole after the liquid storage cavity is filled with epoxy resin mixed glue such that the piston rod is connected to the strain head at the front end, the piston rod moves in the direction of the liquid storage cavity, and the mixed glue overflows from the glue outlet holeand adheres to the bottom of the hole. The small-aperture 16-component conical strain gauge provided by the invention can collect rock strain data in 16 different directions, and the ground stress measurement results are more accurate, the required diameter of the drilling hole is 60mm, the single-point installation cycle is shortened from the past 6h to 2h, the test efficiency is high, and three-dimensional ground stress can be measured with more reliable test results.

Description

technical field [0001] The invention relates to the field of geophysical rock mass stress measurement, in particular to a small-aperture 16-component conical strain gauge. Background technique [0002] In-situ stress is the most fundamental force for the occurrence of underground rock and soil engineering disasters, and it is a key factor affecting the stability of the project. Obtaining in-situ stress data in the engineering area is very important for the safe production of enterprises. At the same time, accurate measurement of ground stress is also a subject that researchers have been diligently exploring. [0003] Generally, in-situ stress measurement methods are divided into direct method and indirect method, and casing stress relief method and hydraulic fracturing method are the most commonly used in-situ stress measurement methods in direct method and indirect method, respectively. Hole bottom stress relief method is a kind of casing stress relief method. This method ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems such as the low test rate and long cycle time of the current hole bottom stress relief method for measuring ground stress, the present invention proposes a small-aperture 16-component conical strain gauge, which can collect rock strain data in 16 different directions, and its measurement results More Accurate, Higher Test Efficiency, Shorter Cycle Times, and More Reliable Measurement Results

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