Excavation induced building damage: Evaluation du risque de dommage des bâtiments provoqué par des excavations

Abstract

Ground decompression 1s usually associated to underground excavation, generally leading to subsidence of the surface. Consequences of such movements on existing buildings must be evaluated especially im urban areas. In this paper a Building Risk Assessment (BRA) method of the type proposed by Burland is presented. Initially, surface movement induced by excavations 1s analysed. Possible consequences on neighbouring structures are then outlined using classifications of damages. Typical damage categories are related to serviceability parameters, past performance of buildings, namely, structural type and behaviour, and its position towards excavation works. Past performance and data behaviour of buildings are used to correct serviceability parameters im order to predict risk of damage. Protective measures for each risk category are established. The method for risk assessment 1s then presented and exemplified. The paper concludes with a discussion on 1ts usefulness and consequences on monitoring activities and plans.