Quick well wall and wall back nondestructive detecting system based on transient electromagnetic method and detection method of the detection system

Abstract

The invention discloses a quick well wall and wall back nondestructive detecting system based on a transient electromagnetic method and a detection method of the detection system, in particular to a detecting system, and a detecting method and a construction process which are matched with the detecting system. The detecting system and the detecting method aim at detecting common defects such as well wall fractures, wall internal cavities, wall thickness issues and wall back holes in the shaft construction or use process, providing bases for subsequent improving schemes or remedial measures, and preventing hazards. Compared with the two common detecting technologies of a ground penetrating radar method and an ultrasonic method, the detecting system and the detecting method are remarkable in benefit and have the advantages that non-contact type measurement is achieved, and construction is easy, convenient and flexible; a three-component receiving probe is adopted, and the space resolving power of detection is ensured; fast scanning type detection can be achieved through a tackle gear and wireless communication; a non-metal structure and wall-attaching type arrangement are adopted, peripheral interference sources can be effectively distanced or avoided, and thus the signal to noise ratio can be increased; the dustproof and waterproof design is adopted for instrument equipment, and thus the continuous and stable work under harsh conditions can be ensured; the shaft construction condition is taken into consideration, and the safety factor is high.

Description

technical field [0001] The invention relates to the fields of shaft concrete well wall and back wall detection and geophysical nondestructive testing, in particular to a well wall and back wall rapid nondestructive testing system and a detection method based on a transient electromagnetic method. Background technique [0002] In order to improve the status quo of my country's shallow coal resources being gradually depleted, deep coal development is being carried out in many areas. In the development and construction of new deep coal wells, the wellbore often needs to pass through deep and thick water-bearing loose layers. At present, the freezing method is usually used for new well construction. As the throat of the whole mine, the quality and stability of the vertical shaft will directly affect the production and safety of the whole mine. As an important maintenance structure of the mine shaft, the shaft wall is currently mostly made of reinforced concrete or concrete stru...

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Problems solved by technology

[0003] Currently, ground-penetrating radar and ultrasonic methods are commonly used for wellbore quality inspection. Among them, the radar method is better for detecting internal defects of the wellbore wall and cavities behind the wall. In addition, the wellbore is closed, causing multiple reflections of electromagnetic waves in the wellbore, which also has a certain impact on the radar image (Reference: Pan Dongming et al. Ground penetrating radar in wellbore grouting and Its application in effect detection. 2007, 35 (2): 25-26.); Ultrasonic method is mostly used for the strength and uniformity detection of well wall concrete, and the detection of shallow cracks on the well wall. Although its detection accuracy is relatively high, but The penetration depth is limited, and the transducer needs to be coupled with the well wall through the medium, which requires high construction conditions and is not conducive to large-scale development

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