Method for detecting geological defect of karst area by combining unmanned aerial vehicle with in-tunnel geophysical exploration

Abstract

The invention discloses a method for detecting the geological defect of a karst area by combining an unmanned aerial vehicle with in-tunnel geophysical exploration. The method comprises the followingsteps: selecting a detection area containing a tunnel to be built in the karst area; performing aerial photography on the detection area by the unmanned aerial vehicle to obtain image information; performing three-dimensional modeling on the detection area according to the image information to obtain a three-dimensional scene, and obtaining the information of the geological defect from the three-dimensional scene; projecting the geological defect to the buried depth of the tunnel to be built, and estimating the information of the geological defect downwards extending to the buried depth of the tunnel to be built; estimating the information of the geological defect at the buried depth of the tunnel to be built according to the information of the geological defect; and performing in-tunnelgeophysical exploration on the geological defect by combining the information of the geological defect at the buried depth of the tunnel to be built in the excavation process of the tunnel to be built. The method can be used to detect the geological defect simply and accurately in order to save the time and the cost, and can eliminate the solution multiplicity of a geophysical exploration resultto accurately detect the geological defect in the karst area.

Description

technical field [0001] The invention relates to a method for detecting geological defects, in particular to a method for detecting geological defects in karst areas combined with unmanned aerial vehicles and geophysical prospecting in caves. Background technique [0002] my country has a vast territory and complex and diverse geological conditions, which to a certain extent create obstacles for the construction of tunnel projects. In recent years, with the further development of my country's western development strategy and infrastructure, more and more tunnels have been built in karst areas. [0003] my country's karst is widely distributed and of many types, and it is one of the countries with the largest karst area in the world. The area of ​​carbonate rocks in the country is more than 1.3 million square kilometers, accounting for about 1 / 7 of the country's land area. If buried karst is included, it is about 2 million square kilometers, accounting for 1 / 5 of the country'...

AI Technical Summary

Problems solved by technology

Due to the various forms and complex distribution of karst structures, it is difficult to accurately find out the basic situation of geological defects with existing technical means, so the construction of tunnels in karst areas is still an extremely high-risk engineering activity

Mud and water inrush often occur due to blind construction, resulting in vicious engineering accidents of machine crashes and fatalities

[0004] At present, the methods used in the industry mainly use seismic wave method, electromagnetic wave method and infrared water exploration, etc. to detect from inside the cave. Due to the various shapes, scales and properties of karst structures such as karst caves and underground rivers, it is often necessary to use seismic reflection waves The seismic wave method for describing geological defects fails, the radar imaging method is difficult to reflect the overall picture of the structure, resulting in misjudgment, the transient electromagnetic method is also difficult to apply due to its own imperfection, and the infrared water detection method is only relatively qualitative for water-bearing structures. D

[0005] At the same time, advanced drilling cannot be used on a large scale due to its high cost and long-term occupation of the excavation surface

[0006] However, building tunnels in karst areas is unavoidable

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