The nature of squeezing ground is complex and partly unknown. The accuracy of the design rules for squeezing ground is limited. The observational procedure is a reliable and useful tool for design of tunnels in such a ground. It is important that the observational procedure is planned and executed in a professional way. The identifying of squeezing ground, instrumentations and monitoring as well as interpretation are all essential steps for a successful design. The regular rock mass classification systems cannot solely be used for identifying squeezing ground. Deformation measurements are normally more reliable and less ambiguous than measurements with stress cells in strain gauges. In order to facilitate the interpretation of measurement results a conceptual method can be useful.
The nature of sq …
AUTORI: Stille H. RIG ANNO: 1999 NUMERO: 1 Numero di pagina: 30