| As the main components of sedimentary layer,stratified geological objects widely distribute and expose on the land surface.The structural characteristics of geological bodies are important factors for studying engineering mechanical properties of geological bodies,as well as the key indicators for evaluating the stability of engineering geological bodies.The structural characteristics exposed on the stratified geological objects,such as areal feature like bedding plane,and linear feature like trace,have certain distribution regularity and statistical significance,which can show mechanical properties of the geological body in the study area more significantly.Therefore,information collection of the structural characteristics of such stratified geological objects is crucial in the researches and analyses of geological characteristics and early warning of geological disasters.However,the traditional contact structure characteristics measurement method is time-consuming and laborious.And it is difficult to meet the measurement requirements of rapid construction and harsh geological conditions.Among the non-contact measurement methods,UAV photogrammetry technology has been widely concerned in engineering geological survey because of its advantages of high efficiency,portability,vertical / lateral recognition and rapid acquisition of high-precision scene point cloud data of the measured object.Through the recognition research based on non-contact measurement methods,we can realize the semi-automatic recognition of geological structure characteristics,regardless of the constraint of complex terrain environment.Based on the high-precision scene point cloud data of UAV photogrammetry technology,we take the structural characteristics of miniature scale stratified geological objects exposed in the field as the study object.In this study,we carry out the comprehensive recognition research of the structural characteristics of areal feature and linear feature.It provides technical support for the selection of multi-structure characteristics recognition algorithm in different scenes and provide the evaluation basis for the stability analysis of the geological objects structure.The main research contents and results of this paper are as follows:(1)Solution scheme design of the structural characteristics recognition and parameter extraction of stratified geological objectsIn order to solve the problems of the structural characteristics recognition and parameter extraction of stratified geological objects,based on the UAV photogrammetry technology and scene point cloud data,we comprehensively analyze the parameter expression requirement of stratified geological objects.Then we design the data organization based on half-edge structure to improve the efficiency of recognition algorithm and provide data organization basis for structural characteristics recognition.Based on scene point cloud data,we also identify research objects and introduce the main methods of structural characteristics recognition of areal feature and linear feature,which provide the solution scheme design of the whole study.(2)Study on the structural characteristics recognition method of stratified geological objects areal featureIn practical engineering,it is necessary to solve the problems of different measurement requirements caused by complex terrain environment.Based on high-precision scene point cloud data,we carry out the research on the construction and improvement of the structural characteristics recognition algorithm of stratified geological objects areal feature.Considering the morphological integrity of structural plane recognition,we recognize and extract the structural characteristics of areal feature.Among them,we use the data organization method of half edge structure to improve the operation efficiency.In this way,we provide the technical and method support for efficient recognition and extraction of structural information in practical engineering application.(3)Study on the structural characteristics recognition method of stratified geological objects linear featureBased on the scene point cloud data,it is difficult to recognize the structural features of linear feature.According to the theory of Analysis of Geometric Properties of Neighborhoods,we use the method of edge detection and feature line tracking to realize the semi-automatic recognition and analysis of linear feature structure characteristics.In this way,we can provide multi feature structural information for the description of geological body.(4)Case application and algorithm verification analysisBased on the scene point cloud data of an exposed section of the Ruqin Lake in Lushan Mountain,we design and realize the comprehensive recognition of the stratified geological objects structural characteristics of areal feature / linear feature.The recognition result is tried-and-trusted to describe the geological body with multiple characteristics and multiple aspects,providing technical support for geological measurement and the stability analysis of the engineering geological based on non-contact measurement method. |
