Detecting system and method for lithology of ultrasmall-caliber drilling hole

Abstract

The invention provides a detecting system and a method for the lithology of an ultrasmall-caliber drilling hole. The detecting system comprises a drilling hole data acquisition module; the drilling hole data acquisition module comprises a metal shell probe, an image pickup unit and a natural gamma ray unit, wherein the image pickup unit and the natural gamma ray unit are arranged in the metal shell probe; the image pickup unit is arranged at the top part of the metal shell probe and comprises a vertical camera or a side camera or combination of the vertical camera and the side camera, wherein the vertical camera is arranged at the top part of the metal shell probe; and the side camera is arranged at the side wall of the metal shell probe. The invention is used for detecting the lithology and the layering thickness of the ultrasmall-caliber drilling hole, and can distinguish the lithologies and the layering thicknesses of the main lithology of the sedimentary formation such as grit, medium sandstone, fine sandstone, siltstone, yakatagite, mudstone, aluminium-soil mudstone, carbon mudstone, coal seam, limestone and igneous rock and the like mainly for the common sedimentary rock formation.

Description

technical field [0001] The invention relates to a system and method for detecting lithology of ultra-small-caliber boreholes, which are applied to various occasions where ultra-small-caliber engineering boreholes are used for lithology detection, such as anchor net support in coal mines and anchor cable construction in ground tunnels. Various types of anchor cable holes, etc., are used to quantitatively determine the stratum layer thickness and basic lithology in small-diameter boreholes, and provide basic geological basis for engineering construction. This method can also be applied to other boreholes. Background technique [0002] In recent years, with the development of shaft and roadway construction technology, anchor net support technology has been widely used in coal mine roadway and ground tunnel construction. The lithology of the construction surrounding rock directly affects the formulation of anchor net support measures, and plays a decisive role in construction s...

AI Technical Summary

Problems solved by technology

However, there are obvious deficiencies in the identification of rock formation lithology: (1) It is greatly affected by the recognition ability of human eyes and the quality of drilling construction (borehole wall smoothness, rock formation softness and hardness, etc.), and it cannot be well distinguished only by photos or videos Similar lithology, such as siltstone, mudstone

(2) Limited by shooting conditions (shooting angle, light, drilling medium, drilling water dripping), the interpretation of videos or photos will vary greatly

Due to the above limitations, lithology identification and thickness quantitative and accurate stratification of small-diameter boreholes cannot be realized only based on video camera technology

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