Development Of 3D Laser Imaging System For Underground Space

Underground space is a “cavity” produced by artificial excavation or natural geological activities on the surface,mainly referring to metal mine goafs,underground air raids,caves,underground tunnels,etc.Due to the unpredictability of geological conditions in underground engineering,the production safety situation in underground space is very serious.It is of great significance to evaluate the distribution of goaf by using effective physical exploration methods.At present,various physical exploration methods are used for large-area detection,and the distribution and burial depth of the goaf are initially determined,and then drilled for verification.The application of underground space laser 3D imaging exploration in goaf can accurately grasp the area,depth,shape and volume and other characteristic parameters,so that the detection of underground space such as goaf can enter the visual precision measurement.This paper designs a detection device of underground space laser 3D imaging system for underground engineering exploration,which includes underground space laser detection module and PC upper computer module.The following technical requirements are proposed for each module: the laser detection module drives the laser detector to perform vertical 0-180 degrees and horizontal 0-360 degrees rotation,and the laser detection distance does not exceed 100 m;the PC upper computer module has laser detection angle control function,laser detection control and data saving functions,underground space 3D imaging function,irregular underground space volume calculation function and image section display function.The laser detection module is divided into laser detector,DC reducer,stepper motor,drive circuit,485 communication module,MCU control and other units.Each unit is designed and simulated separately,and integrated.Appearance mechanical structure of laser detection device is designed by UG software.Laser detection module device is made by 3D printing technology.PC upper computer is programmed and designed based on LabVIEW platform.The laser detection module is controlled remotely by 485 serial communication module.The received detection data are stored in a specific format in the preset path,and the three-dimensional data are displayed and calculated,and sectional imaging,etc.The laser detection device is integrated with the upper computer to produce a receiving prototype,which runs steadily after testing.In the laboratory test,the functions of key parameters meet the design requirements.In order to verify the actual effect of the instrument,field tests were carried out in the Sandaozhuang molybdenum mining area in Luanchuan,Henan Province,and multiple measurements were taken at the boreholes of the geometric shapes of several known goafs.After analyzing the experimental process and results,It is proved that the underground space laser 3D detection device designed in this paper has strong function and reliability in field detection,and can be used for detecting underground space such as gob area with a radius of 0-100 m.