Monitoring of rock surface shape using laser scanner

摘要

Rock shape monitoring is one of the most important issues in geotechnical engineering. Rockrnslope failure and underbreak and overbreak in tunnels can be detected by observing the surface shape. Furthermore,rnthe cutting shape of rock in waterjet aided tunneling is a key factor determining performance. 2-D laserrnscanners have been adopted to identify the surface shape of rock. Previous papers on waterjet cutting shapernmonitoring methods have reported that the effective factors of measurement using a laser scanner are laser distance,rnangle resolution, and surface shape. In this study, laser scanning speed and data averaging frequency arernadditionally considered as effective factors for laser scanner measurement in waterjet cutting shape monitoring.rnIt is found that a wide opening of the free surface and at least 10 averaged data are necessary to guaranteernaccurate measurement.