STUDY ON GEOMETRICAL INFORMATION OF OBRAINING ROCK MASS DISCONTINUITIES IN HIGH-SPEED RAILWAY KARST TUNNELS BASED ON 3D LASER SCANNING TECHNOLOGY

摘要

The geological conditions and environment of karst tunnel are very complex,and traditional monitoring methods are of heavy workload,low efficiency,and security risks.3D laser scanning technology has a high sampling rate,and can more accurate,quick accurately express the true complex situation of the tunnel.In this paper,according to the characteristics of karst tunnels,it uses three-dimensional laser scanning technology for tunnel monitoring,and establishes a semi-automatic method for face identification,and compared the obtained three-dimensional structure of the rock surface in the tunneI with that of traditional access methods.The results show that: the accuracy of the information acquiring from 3D laser scanning technology can meet the requirements,so it is effective in karst tunnel,and can be used to guide the construction of tunnel;Three-dimensional laser scanner used in underground works such as rock engineering in hidden tunnels can acquire spatial information and true and reliable,fast and efficient other than traditional monitoring methods,this technology has great prospects in a wide range of applications.