The use of terrestrial laser scanning（TLS） in the caves has been growing drastically over the last decade.However, TLS application to cave stability assessment has not received much attention of researchers.This stu...The use of terrestrial laser scanning（TLS） in the caves has been growing drastically over the last decade.However, TLS application to cave stability assessment has not received much attention of researchers.This study attempted to utilize rock surface orientations obtained from TLS point cloud collected along cave passages to（1） investigate the influence of rock geostructure on cave passage development, and（2）assess cave stability by determining areas susceptible to different failure types. The TLS point cloud was divided into six parts（Entry hall, Chamber, Main hall, Shaft 1, Shaft 2 and Shaft 3）, each representing different segments of the cave passages. Furthermore, the surface orientation information was extracted and grouped into surface discontinuity joint sets. The computed global mean and best-fit planes of the entire cave show that the outcrop dips 290° with a major north-south strike. But at individual level, the passages with dip angle between 26° and 80° are featured with dip direction of 75°-322°. Kinematic tests reveal the potential for various failure modes of rock slope. Our findings show that toppling is the dominant failure type accounting for high-risk rockfall in the cave, with probabilities of 75.26%, 43.07%and 24.82% in the Entry hall, Main hall and Shaft 2, respectively. Unlike Shaft 2 characterized by high risk of the three failure types（32.49%, 24.82% and 50%）, the chamber and Shaft 3 passages are not suffering from slope failure. The results also show that the characteristics of rock geostructure considerably influence the development of the cave passages, and four sections of the cave are susceptible to different slope failure types, at varying degrees of risk.展开更多
采用地面三维激光扫描技术(Terrestrial Laser Scanning,TLS)对建(构)筑物进行变形监测,替代传统监测方式,由以往的单点监测数据获取转变为快速、实时三维坐标测量。通过点云数据建立建筑信息模型(Building Information Modeling,BIM),...采用地面三维激光扫描技术(Terrestrial Laser Scanning,TLS)对建(构)筑物进行变形监测,替代传统监测方式,由以往的单点监测数据获取转变为快速、实时三维坐标测量。通过点云数据建立建筑信息模型(Building Information Modeling,BIM),借助Revit二次开发,实现建筑变形信息管理及可视化。工程实例表明,将监测信息与建筑模型关联,开发监测信息可视化插件,以可交互、可视化的方式进行监测工作,降低了监测难度,同时提高了监测的信息化程度。展开更多
基金supported by Ministry of Higher Education, Malaysia research grant(No. FRGS/1-2014-STWN06/UPM/02/1) with vote number 5524502University Putra Malaysia research grant(No.GP-1/2014/943200)
文摘The use of terrestrial laser scanning（TLS） in the caves has been growing drastically over the last decade.However, TLS application to cave stability assessment has not received much attention of researchers.This study attempted to utilize rock surface orientations obtained from TLS point cloud collected along cave passages to（1） investigate the influence of rock geostructure on cave passage development, and（2）assess cave stability by determining areas susceptible to different failure types. The TLS point cloud was divided into six parts（Entry hall, Chamber, Main hall, Shaft 1, Shaft 2 and Shaft 3）, each representing different segments of the cave passages. Furthermore, the surface orientation information was extracted and grouped into surface discontinuity joint sets. The computed global mean and best-fit planes of the entire cave show that the outcrop dips 290° with a major north-south strike. But at individual level, the passages with dip angle between 26° and 80° are featured with dip direction of 75°-322°. Kinematic tests reveal the potential for various failure modes of rock slope. Our findings show that toppling is the dominant failure type accounting for high-risk rockfall in the cave, with probabilities of 75.26%, 43.07%and 24.82% in the Entry hall, Main hall and Shaft 2, respectively. Unlike Shaft 2 characterized by high risk of the three failure types（32.49%, 24.82% and 50%）, the chamber and Shaft 3 passages are not suffering from slope failure. The results also show that the characteristics of rock geostructure considerably influence the development of the cave passages, and four sections of the cave are susceptible to different slope failure types, at varying degrees of risk.
文摘采用地面三维激光扫描技术(Terrestrial Laser Scanning,TLS)对建(构)筑物进行变形监测,替代传统监测方式,由以往的单点监测数据获取转变为快速、实时三维坐标测量。通过点云数据建立建筑信息模型(Building Information Modeling,BIM),借助Revit二次开发,实现建筑变形信息管理及可视化。工程实例表明,将监测信息与建筑模型关联,开发监测信息可视化插件,以可交互、可视化的方式进行监测工作,降低了监测难度,同时提高了监测的信息化程度。
