Application of 3-D Laser Scanning Technique to Slope Movement Monitoring
Kwong, A
Department of Civil Engineering, The University of Hong Kong, Hong Kong

Tham, L
Department of Civil Engineering, The University of Hong Kong, Hong Kong

King, B
Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong

(Received 13 July 2004; accepted 12 January 2005)

Abstract
A full-scale field test was carried out on a loosely-compacted fill slope that had been installed with soil nails. The slope was brought to limit equilibrium by subjecting it to a surcharge at the slope crest in combination with induced rise in phreatic surface and precipitation. Heavy instrumentation comprised of in-place inclinometer, vibrating wire piezometers, vibrating wire extensometer, earth pressure cell, tensiometer, and strain gages along the soil nails had been monitored throughout the test. Surface movement was monitored using a GPS system and a 3-D laser scanning technique.
This paper focuses on the use of a 3-D laser scanner in capturing the formation of cracks and surface movement during the failure. It is demonstrated that with the use of this technique, the surface movement of the slope can be accurately recorded without the need of physically accessing the slope surface.

Keywords:
3-D laser scanning, fill slope, instrumentation, movement monitoring, phreatic surface, slope movement, slope stability, soil nail

Paper ID: JTE12681
DOI: 10.1520/JTE12681

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Author Kwong, A Affiliation Department of Civil Engineering, The University of Hong Kong, Hong Kong Author Tham, L Affiliation Department of Civil Engineering, The University of Hong Kong, Hong Kong Author King, B Affiliation Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong Author Kwong AK, Tham LG, King BA Title Application of 3-D Laser Scanning Technique to Slope Movement Monitoring Symposium , Committee on