A device and method for pushing and positioning hollow inclusions in deep hole ground stress testing

Abstract

The invention discloses a pushing and positioning device of a hollow inclusion in a deep hole ground stress test, which comprises a positioning rod, wherein a top positioning groove, a horizontal positioning groove and an inclusion cable positioning groove are formed in the top of the front end of the positioning rod; a first group of positioning supports and a second group of positioning supports are sequentially arranged on the positioning rod from the front end to the rear end; a camera is also arranged at the front end of the positioning rod; a three-dimensional electronic compass is also horizontally arranged on the positioning rod; and the rear end of the positioning rod is connected with a plurality of pushing rods. The invention also discloses a pushing and positioning method of the hollow inclusion in the deep hole ground stress test, which comprises the following steps: measuring the space position of an orifice; pushing the hollow inclusion; enabling the hollow inclusion to enter a small hole; and measuring the installation position of the hollow inclusion. The device disclosed by the invention has high pushing efficiency in the hole, can enable the inclusion to smoothly enter the small hole, can accurately determine the space position of the hollow inclusion, increases the ground stress testing accuracy, is simple in structure, and can be quickly spliced.

Description

technical field [0001] The invention relates to geotechnical engineering testing technology, in particular to a device for pushing and positioning hollow inclusions in deep hole stress testing, and also relates to a method for pushing and positioning hollow inclusions in deep hole stress testing. Background technique [0002] With the development and utilization of underground space, underground engineering has become an indispensable part of human living environment. In the design and construction process of underground engineering, the stress level of the original rock directly determines the support design of the structure, the section form of the structure, and the construction method. Accurate measurement of the stress level of the original rock is the key to ensure the safety and stability of the structure and optimize the support design. necessary condition. [0003] At present, the hollow inclusion borehole stress relief method is one of the most commonly used metho...

AI Technical Summary

Problems solved by technology

However, with the improvement of human underground engineering construction technology, the buried depth and section size of underground engineering are continuously increasing, and the increase in buried depth and section size will inevitably lead to an increase in the depth of the test hole.

As the depth of the test hole increases, the relative stiffness of the push rod decreases, and it will also bend during the push process. When the installer cannot distinguish the position of the small hole, it is easy to make the guide rod of the package body withstand the bottom of the large hole, causing the fixing pin to break , adhesive squeezed out, causing the test to fail

At the same time, in the deep hole in-situ stress test, the bending of the borehole, the bending of the push rod, and the rotation of the inclusion will cause the difference between the spatial orientation of the inclusion and the opening. Inaccurate test results

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