Large-scale monitoring of retaining structures: new approaches on the　safety assessment of retaining structures using mobile mapping

摘要

In mountainous regions, the usability of roads and railway tracks strongly depends on the safety and the condition ofretaining structures. Consequently, an early detection and identification of structural degradation, damages and potentialfailure mechanisms is of major interest. Currently, single point measurements using total stations or other sensors depictthe state-of-the-art in deformation monitoring of retaining structures. Due to the large number of such structures inmountainous regions, e.g. the Alps, establishing a monitoring system for every object is unfeasible. This paper presentsan approach for a large-scale deformation monitoring with a mobile mapping system (MMS). A MMS with two highqualitylaser scanners has been installed on the roof of a standard car. A newly developed algorithm processes thegathered data in a partially automated manner in order to perform deformation analysis on the one hand and to detectstructural deficiencies (e.g. concrete spalling) on the other hand. Data of multiple (periodical) measurement campaigns ofselected retaining structures have been used to evaluate the proposed approach. It is demonstrated, that mobile mappingin combination with targeted processing algorithms is a promising, efficient and comprehensive alternative to traditionalstatic, single point monitoring solutions.