Method for identifying lithologic interface in front of direct current detection roadway heading face

Abstract

The invention discloses a method for identifying a lithologic interface in front of a direct-current detection roadway tunneling face, which comprises the following steps of: 1, arranging a three-pole advanced detection device, 2, measuring the power supply current and the receiving potential difference of each measuring point, 3, respectively calculating the spherical shell apparent resistivity of each measuring point in three groups of measuring points, 4, calculating the spherical shell apparent resistivity of each measuring point in the three groups of measuring points, and 5, identifying the lithologic interface in front of the direct-current detection roadway tunneling face. The method comprises the following steps of 1, respectively drawing three groups of spherical shell resistivity curves, 5, carrying out interference suppression and data superposition processing on the three groups of spherical shell resistivity curves, and 6, carrying out lithologic interface identification according to a comprehensive curve. According to the method, the low-resistance abnormal region can be delimited according to the apparent resistivity value of the spherical shell in the apparent resistivity curve of the spherical shell in front of the tunneling surface for lithologic interface identification.

Description

technical field [0001] The invention belongs to the technical field of coal geophysical prospecting, and relates to the identification of a lithology interface in a roadway for direct current detection, and in particular to a method for identifying the lithology interface in front of a roadway excavation face by direct current detection. Background technique [0002] Mine direct current method is a widely used coal mine geophysical monitoring technology. It has been well applied in the monitoring of coal mine water structure and gas anomaly area. However, there are the following problems in actual work. The interpretation method and working conditions are limited. The data often differ greatly from the results of numerical calculations. There are many solutions for a single parameter of apparent resistivity, which leads to more abnormalities and more drilling in coal mines; sometimes abnormalities cannot be found, and even wrong results are explained without further processin...

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Problems solved by technology

[0003] Aiming at the defects and insufficiencies in the prior art, the present invention provides a method for identifying the lithology interface in front of the roadway excavation face by direct current detection, so as to solve the problem that the existing advance detection method for coal mine roadway excavation cannot accurately explain the abnormal position of low resistance, The problem of not being able to predict the lithological interface ahead of the face

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