A MODEL FOR SWELLING ROCK IN TUNNELING

Authors
Citation
G. Anagnostou, A MODEL FOR SWELLING ROCK IN TUNNELING, Rock mechanics and rock engineering, 26(4), 1993, pp. 307-331
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary","Engineering, Civil
ISSN journal
0723-2632
Volume
26
Issue
4
Year of publication
1993
Pages
307 - 331
Database
ISI
SICI code
0723-2632(1993)26:4<307:AMFSRI>2.0.ZU;2-F
Abstract
In this paper, the phenomenon of swelling in tunnelling will be treate d as a hydraulic-mechanical coupled process. This approach allows one to model the observed floor heaves realistically, i. e. without the pr ediction inevitable in the previous models of movements at the tunnel crown and walls. Furthermore, the development of heave and pressure ov er the course of time can be studied. The absence of deformations abov e the floor level is here interpreted as a consequence of the hydrauli c boundary conditions. Besides the importance of seepage flow, the inf luence of rock strength is illustrated. Swelling rock is considered as an elastoplastic material. This allows one to predict the often large heaves of a tunnel floor as observed in situ. According to the numeri cal results, the area of practically relevant swelling strains extends as far as the plastic zone.