Crystal growth and soil expansion: the role of interfacial pressure and pore structure
14969565.pdf (3,253Mb) (Restricted access) Request copy
Què és aquest botó?
Aquest botó permet demanar una còpia d'un document restringit a l'autor. Es mostra quan:
- Disposem del correu electrònic de l'autor
- El document té una mida inferior a 20 Mb
- Es tracta d'un document d'accés restringit per decisió de l'autor o d'un document d'accés restringit per política de l'editorial
Document typeConference report
Rights accessRestricted access - publisher's policy
The paper summarizes first a set of field observations in connection with the severe heave experienced by Lilla tunnel excavated in a Tertiary anhydritic claystone. Heave and swelling pressures against the tunnel rigid lining were a consequence of gypsum crystal growth on discontinuities. This process requires water because gypsum crystals precipitate from supersaturated solutions of calcium sulfate. The paper concentrates on the precipitation of crystal in pores of varying geometry with the purpose of deriving theoretical expressions for the crystal pressure against the (assumed rigid) pore walls. The problem is solved by two complementary approaches: the thermodynamic requirements for the equilibrium of the chemical reaction of precipitation and the consideration of the surface energy at the crystal-solution interface. The phenomenon has strong similarities with other interfaces of interest in unsaturated soil mechanics which are highlighted. The expressions found for the crystal pressure are considered an upper bound for pressures likely to develop
CitationRamon, A., Alonso, E. Crystal growth and soil expansion: the role of interfacial pressure and pore structure. A: International Conference on Unsaturated Soils. "Unsaturated Soils: Research & Applications". Sydney: CRC Press, 2014, p. 875-881.
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder