Research On The Quantitative Extraction Algorithm Of 3D Laser Point Cloud Information Of Rock Mass Structural Plane

The structural plane of rock mass is a geological interface with different directions,scales,shapes and characteristics.It's a basic unit which constitutes rock mass structure and controls the mechanical properties of rock mass.The correct identification and extraction of structural surfaces is an important basis for studying the deformation,seepage and stability of rock mass.The traditional measuring method has many shortcomings.For example,heavy workload,low efficiency and it is difficult to guarantee of personnel.For the high and steep slope which is not accessible,geological survey personnel cannot complete the measurement task.The emergence and development of 3D laser scanning technology provides a new idea for the structural plane measurement.And it provides the possibility for the structural planes recognition and geometric parameters extraction with advantages of high speed,accuracy,efficiency and non-contact.This paper proposes a method to identify rock discontinuity and extract geometric parameters using 3D laser scanning data.The specific research content and results are as follows:(1)Many techniques and methods of rock discontinuity identification are summarized and analyzed.And this paper discusses the limitations and shortcomings of existing methods and proposes a method of extracting rock discontinuity aim at point cloud for rock mass.(2)After in-depth understanding and analysis of exposed forms of rock mass structure and significance of geometric parameters of rock mass structural plane,the paper proposes the method to calculate dip direction,dip angle,space,roughness and trace from point cloud of rock mass according to characteristics of rock point cloud data.(3)Using the C++programming language,graphic visualization library VTK,interface design library Qt,and point cloud library PCL(Point Cloud Library)to achieve the algorithms for rock discontinuity identification and geometric parameter calculation proposed in this paper.At the same time,the paper designs a prototype system of rock discontinuity surface identification based on 3D laser and achieves the rock discontinuity surface identification and calculation of geometric parameters.(4)Taking two typical 3D laser point cloud data as example,using a prototype system of rock discontinuity surface identification based on 3D laser to implement experimental analysis and the experimental results show that the rock discontinuity surface can be correctly identified.In addition,the results of this paper were compared with foreign scholars5 research and the results of Poly Works,which verified the validity,reliability and engineering applicability of the theories and methods proposed in this paper.