Method and device for detecting three-dimensional structure of underground cavity

A technology of three-dimensional structure and underground cavity, which is applied in the directions of measuring devices, surveying and navigation, instruments, etc., can solve the problems of difficult shape and volume of underground cavity, expensive system, expensive equipment, etc., and achieve low equipment price and operability High performance, improved detection accuracy and safety factor

Pending Publication Date: 2017-11-24
CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, only OPTECH's CMS (3D 3D Laser Scanning System for Cavities) and MDL's C-ALS (3D Laser Scanning System for Underground Caves) can accurately scan the internal structure of underground cavities with 3D lasers. The cameras in the belt can observe the internal conditions of underground cavities in real time, but due to the high price of the system and serious technical barriers, it is difficult to popularize and apply it in China
[0009] Therefore, in the process of detecting the three-dimensional structure of underground cavities at present, there are disadvantages of using conventional detection methods to detect the shape and volume of underground cavities is very difficult, real-time performance is poor, detection accuracy is low, intuitiveness is poor, and the safety factor is low. ;Using foreign CMS, C-ALS three-dimensional laser scanning system for detection, the equipment is expensive, the operation is relatively complicated, and the detection cost is high

Method used

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  • Method and device for detecting three-dimensional structure of underground cavity
  • Method and device for detecting three-dimensional structure of underground cavity
  • Method and device for detecting three-dimensional structure of underground cavity

Examples

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Effect test

Embodiment 1

[0036] Example 1. A detection method for the three-dimensional structure of an underground cavity, such as figure 1 with figure 2 As shown, the method is to detect the three-dimensional structure of the underground cavity by collecting the three-dimensional data of the cavity by the probe.

[0037] The method is to put the probe into the cavity, the probe emits laser light and receives the reflected light of the cavity wall, thereby obtaining the three-dimensional data of the cavity, and detecting the three-dimensional structure of the underground cavity.

[0038] The method is to use the laser ranging device of the probe to measure the time difference between emitting the laser light and receiving the reflected light from the cave wall, and measuring the distance between the probe and the cave wall. Scan a 360° circle in the horizontal direction to obtain several contour point data of the cavity, and then transmit the contour point data of each layer obtained by the probe ...

Embodiment 2

[0043] Example 2. The applicant applied the present invention to multiple engineering projects, among which the curtain karst on the right bank of the top floor of a certain hydropower station was detected. The detection results are as follows: Figure 3 to Figure 6 As shown, according to the detection results, the karst cave near the borehole is in the shape of a "stomach", nearly east-west, the karst cave is small in the east and large in the west, high in the east and low in the west, with a volume of about 150m 3 . After the post-construction verification, there is no deviation in the detection results, and the detection results have high precision.

[0044] Working principle: In the exploration of karst areas, a large number of underground cavities, mainly karst caves, are often encountered. The invention can detect the direction, shape and size of the cavities more accurately. Firstly, conventional exploration means are used to determine the position of the underground...

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Abstract

The invention discloses a method and device for detecting the three-dimensional structure of an underground cavity. The invention is characterized in that the method detects the three-dimensional structure of the underground cavity by collecting the three-dimensional data of the cavity through a probe; and the detection device comprises a host and the probe connected with the host via a cable. Compared with conventional detection means, the method and device provided by invention reduce detection difficulty, improve detection accuracy and safety factors, and have the advantages of good real-time performance and high operability in the case of meeting the basic requirements of detection. Compared with a conventional three-dimensional laser scanning system, the device provided by the invention has the characteristics of low equipment cost, easy operation and low production cost.

Description

technical field [0001] The invention relates to an engineering exploration method and device, in particular to a detection method and device for a three-dimensional structure of an underground cavity. Background technique [0002] Underground cavities such as karst caves and goafs pose more and more serious threats to construction projects such as water conservancy and hydropower, surface buildings, roads, bridges, and tunnels. Therefore, in engineering survey and testing projects, accurate detection of underground cavities is becoming more and more important urgent. Accurate detection of underground cavities is of great significance for analyzing geological structures, etc. It can effectively guide engineering construction and eliminate a series of potential safety hazards caused by underground cavities. [0003] Common underground cavity detection methods include electrical methods, transient electromagnetics, ground penetrating radar, seismic reflection, geological drill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C7/06
CPCG01C7/06
Inventor 楼加丁
Owner CHINA POWER CONSRTUCTION GRP GUIYANG SURVEY & DESIGN INST CO LTD
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