Small bore inner wall strain foil pasting method for rock stress releasing test and apparatus thereof

Abstract

The invention discloses a small bore inner wall strain foil pasting method for a rock stress releasing test and an apparatus thereof. Two air bags are arranged at a fixing device, a strain foil pasting laying piece and a binder storage apparatus are respectively arranged at two air bags, and a groove connected with the binder storage apparatus is arranged at the strain foil pasting laying piece; the strain foil is temporarily fixed at the strain foil pasting laying piece, and the air bag is conveyed to a set position in a small bore; the air bag of the binder is inflated, the binder is extruded between the groove and the inner wall of the bore, the air bag of the strain foil pasting laying piece is inflated, and the strain foil is pasted at the inner wall of the bore; after the strain foilis fixed, the air bag, the binder storage apparatus and the strain foil pasting laying piece are recovered through twisting, and the strain foil can be pasted. The pasting work of the strain foil atthe inner wall of the small bore of the rock is conveniently and accurately realized.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics tests, and relates to a method and a device for pasting strain gauges on the inner wall of small boreholes for rock stress relief tests. Background technique [0002] In the rock stress relief test, it is necessary to test the strain value of the rock under the external load. Strain gauges are often used for testing. The strain gauges have the advantages of high precision and low price. Generally, the strain gauges are pasted on the outer surface of the specimen. When it is necessary to test the internal strain of the rock, such as the deformation characteristics of the inner wall of a small rock drilling hole under loading and unloading conditions, the size of the drilling hole is too small, about 3 to 5 cm, and the hole depth is 10 to 30 cm. The space is narrow, and it is very difficult to paste the strain gauge. Only special measures can be operated, and there is a lack of convenient and...

AI Technical Summary

Problems solved by technology

When it is necessary to test the internal strain of the rock, such as the deformation characteristics of the inner wall of a small rock drilling hole under loading and unloading conditions, the size of the drilling hole is too small, about 3 to 5 cm, and the hole depth is 10 to 30 cm. The space is narrow, and it is very difficult to paste the strain gauge. Only special measures can be operated, and there is a lack of convenient and accurate tools or devices for sticking strain gauges on the inner wall of small rock drilling holes

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