An optical microscopic stress measurement device based on the principle of aperture deformation

Abstract

The invention discloses an optical microscope geostress measurement device based on the aperture deformation principle. The optical microscope geostress measurement device comprises a multi-contact-probe measurement component and an optical microscope imaging component; a plurality of sets of contact probes are installed in the multi-contact-probe measurement component in a paired mode, a contact of each contact probe is in contact with the hole wall of a drilled hole to sense aperture changes, and probe tips of the contact probes are concentrated in a tiny area to be synchronous with the contacts in change. The optical microscope imaging component is a sealing barrel with a window and a light source window, and a camera, a microscope lens, a digital compass and an annular light source are located in the optical microscope imaging component. The multi-contact-probe measurement component and the optical microscope imaging component are connected together through a screw; in addition, the microscope lens is aligned with the tiny area containing the tip ends of the contact probes through the window. In brief, the geostress measurement device using the multi-contact-probe aperture deformation sensing structure and the optical microscope measurement technology is provided, and the synchronous multi-group testing capacity is achieved. The optical microscope geostress measurement device is ingenious in design, premise in conception, simple in structure and easy to implement.

Description

technical field [0001] The present invention relates to an optical microscopic ground stress measurement device based on the principle of aperture deformation, and more specifically relates to a measurement device which utilizes optical microscopic measurement technology to obtain multi-point aperture deformation in a borehole and uses the principle of aperture deformation to understand the ground stress; It breaks through the limitations of in-situ stress testing devices based on strain gauges / displacement sensors, expands the application range of in-situ stress testing, promotes the further development of in-situ stress testing technology, and is more suitable for the development and utilization of shale gas. Background technique [0002] In-situ stress exists widely, but it is difficult to obtain and reveal. At the same time, it plays an important role in the planning, design and decision-making of deep engineering. With the continuous exploration of the deep crust by hum...

AI Technical Summary

Problems solved by technology

Usually, this kind of test device works well when measuring in shallow holes, but as the test depth increases, the temperature and groundwater conditions will change, and it is difficult for the commonly used sensors to meet the requirements, making the test depth of this test device Often limited to a range of several hundred meters, it is difficult to achieve a breakthrough in the test depth of a thousand meters

In addition, the equipment installation and testing process of the stress relief method is relatively complicated, including multiple steps such as measuring hole drilling, sensor layout, and release hole drilling and real-time measurement. Each step requires the cooperation and separation of the drilling machine, especially the sensor layout The problem of lead wires seriously hinders the application of this method in deep holes

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