Method for acquiring multi-stage underground three-dimensional form of dynamic fracture based on ground penetrating radar

Abstract

The invention discloses a method for acquiring a multi-stage underground three-dimensional form of a dynamic fracture based on a ground penetrating radar, and the method comprises the following steps: laying a thin film on the surface of an area where a fracture is located, and guaranteeing that the surface of the fracture is completely covered by the thin film; pouring liquid on the thin film; aligning the ground penetrating radar to the fracture at a near-surface position of the fracture, and performing interval scanning along a vertical direction of a line fracture trend as a path to obtain electromagnetic wave data of a plurality of sections of the underground form of the current fracture; extracting and storing the liquid, and removing the film; carrying out data processing on all the obtained electromagnetic wave data in the current period, and describing the contour of the fracture at each section in the current period through a visual interpretation method; constructing a three-dimensional model of the current underground form of the fracture by using the contour of the fracture to obtain the current underground three-dimensional form of the fracture and related data thereof; and continuously repeating the steps to obtain a multi-stage underground three-dimensional form and related data thereof in a fracture development dynamic change process. According to the method, the multi-stage underground form of the dynamic fracture can be obtained in a lossless manner.

Description

technical field [0001] The invention relates to the field of land reclamation in coal mining subsidence land, in particular to a method for obtaining multi-phase underground three-dimensional shapes of dynamic cracks based on ground penetrating radar. Background technique [0002] In the west of China, especially the wind-blown sand and loess areas in the west, ground fissures are one of the geological environmental problems caused by coal mining, causing deformation of buildings, damage to underground pipelines, damage to cultivated land, accelerated evaporation of soil moisture, destruction of vegetation, Problems such as water and soil erosion have brought great difficulties to mining area management workers, and are also an important part of land reclamation in mining areas. In order to study the impact of ground fissures on the ecological environment, it is essential to obtain the underground morphology of ground fissures to assess its risk and study the development of ...

AI Technical Summary

Problems solved by technology

At present, some scholars inject gypsum slurry into the cracks, and use ground penetrating radar technology to obtain the underground morphology of cracks after the gypsum solidifies. However, this method will destroy the structure of ground fissures and affect the subsequent development process of ground fissures, and the gypsum slurry injection is not uniform. It will lead to insufficient filling inside the fracture, which cannot be used for the study of the underground morphology of dynamic fractures

At the same time, some scholars excavate a working section on one side of the ground fissure, and then obtain the underground shape of the crack through the horizontal scanner of ground penetrating radar technology. Although this method is not harmful to the crack, it requires a very large amount of engineering when the crack is deep. It is time-consuming and labor-intensive. When the width of the crack is small, the results of GPR will have a large error, and it will also cause great damage to the surrounding surface environment.

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