Geological borehole wall rock strain measurement device

Abstract

The present invention relates to a geologic drill hole wall wall rock strain measurement device in rock stress gaging practice field. In the invention, lifting mechanism connects with upper end of outer cylinder sleeve, hermetically-sealed cable joint connects with electronic equipments cabin which is at the bottom of lifting mechanism, multipath strain measurement instrument and computer control unit are placed in electronic equipments cabin, the bottom of electronic equipments cabin has a cooling pump cabin, bottom of cooling pump cabin has a upper packer which is fixed in the outer cylinder sleeve by upper bracket of packer, the bottom packer connects with the bottom part of outer cylinder sleeve by the bottom bracket of packer, strain measurement main working part which is placed between upper packer and lower packer integrates with inner cylinder sleeve and push mechanism, front work window and back work window are placed at the corresponding place in outer cylinder sleeve, lower equipment cabin situated at tail of outer cylinder sleeve. The product of the present invention decreases probability of breaking core, improves success rate of stress measurement, and can be used in hundreds-meter deep hole.

Description

technical field [0001] The invention relates to a device in the field of measurement technology, in particular to a device for measuring the strain of the surrounding rock of a geological drilling hole wall. Background technique [0002] The stress state of the crust is one of the most important properties of the crust. Fully understanding and understanding the stress state of the crust is not only one of the very important issues in geomechanics and geophysics, but also one of the very important issues in rock mechanics and engineering. In situ rock stress measurement is It is the most direct and reliable means to obtain the crustal stress state data. The research on in-situ rock stress measurement methods and technologies at home and abroad has a development history of more than 70 years, and there are dozens of related testing instruments. Among them, the measuring equipment based on the borehole stress relief method has been widely used in the field of geotechnical engin...

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Problems solved by technology

When using this instrument to measure strain, casing drilling is required. When the borehole exceeds a certain depth, the problem of broken core is prone to occur, resulting in measurement failure. This is also an important reason for the low success rate of rock stress measurement using this method.

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