Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Residual lateral stress effect on the swelling pressure measurements of compacted bentonite/claystone mixture
Abstract The design of sealing/backfill elements in high level radioactive waste disposal repository often depends on the laboratory results in terms of swelling pressure and hydraulic conductivity. In this study, a series of swelling pressure test were performed on compacted specimens of MX80 bentonite and Callovo-Oxfordian (COx) claystone mixture with different initial stress state (with and without residual stress relaxation), aiming at investigating the effects of compaction induced residual lateral stress on the swelling pressure. Two methods named “Trimming” and “Transfer” were applied for the residual stress relaxation; whereas specimens were directly compacted in the hydration ring to simulate the case without residual stress relaxation. A higher swelling pressure was obtained on the specimens directly compacted in the testing ring compared to their counterparts with residual stress relaxation. Regarding to the relaxation methods, “Transfer” is more practical for specimen preparation in the laboratory, as it allows the relaxation of the stress without changes in specimens' diameter and mass.
Highlights Series of swelling pressure test were conducted on compacted specimens prepared by different procedures. Different swelling pressures were obtained from specimens with and without residual stress relaxation. A practical method was recommended for specimen preparation in laboratory for residual lateral stress relaxation.
Residual lateral stress effect on the swelling pressure measurements of compacted bentonite/claystone mixture
Abstract The design of sealing/backfill elements in high level radioactive waste disposal repository often depends on the laboratory results in terms of swelling pressure and hydraulic conductivity. In this study, a series of swelling pressure test were performed on compacted specimens of MX80 bentonite and Callovo-Oxfordian (COx) claystone mixture with different initial stress state (with and without residual stress relaxation), aiming at investigating the effects of compaction induced residual lateral stress on the swelling pressure. Two methods named “Trimming” and “Transfer” were applied for the residual stress relaxation; whereas specimens were directly compacted in the hydration ring to simulate the case without residual stress relaxation. A higher swelling pressure was obtained on the specimens directly compacted in the testing ring compared to their counterparts with residual stress relaxation. Regarding to the relaxation methods, “Transfer” is more practical for specimen preparation in the laboratory, as it allows the relaxation of the stress without changes in specimens' diameter and mass.
Highlights Series of swelling pressure test were conducted on compacted specimens prepared by different procedures. Different swelling pressures were obtained from specimens with and without residual stress relaxation. A practical method was recommended for specimen preparation in laboratory for residual lateral stress relaxation.
Residual lateral stress effect on the swelling pressure measurements of compacted bentonite/claystone mixture
Wang, Qiong (Autor:in) / Su, Wei (Autor:in) / Cui, Yu-Jun (Autor:in) / Ye, Wei-Min (Autor:in) / Chen, Yong-Gui (Autor:in)
Engineering Geology ; 295
21.10.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Experimental study on the swelling behaviour of bentonite/claystone mixture
| British Library Online Contents | 2012