HYDROMECHANICAL COUPLING PHENOMENA OBSERVED DURING A SHAFT SINKING EXPERIMENT IN A DEEP ARGILLACEOUS ROCK
In the framework of the feasibility study of a radioactive-waste repository in a geological formation, Andra is building an underground research laboratory within a Callovo-Oxfordian argillite formation located in Eastern France. During the sinking of the laboratorys access shaft, the mechanical and hydromechanical behaviour of the argillites were monitored through an in-situ experimental programme called REP. The experimental zone is located between 460 and 476 m depth. From a drift located at -445 m, 15 instrumentation boreholes were drilled downwards and equipped with 120 mechanical and hydraulic sensors. This paper is devoted to the analysis of the measurements recorded. In-situ measurements show a high coupling between stress redistribution and pore pressure. Transient overpressure is recorded in several pressure-measurement chambers and it is consistent with the in-situ anisotropic stress state. Measurements of water permeability in the adjacent rock, carried out after excavation,. show a limited increase of permeability.
G.Armand K.Su
French National Radioactive Waste Management Agency -Andra
国际会议
南京
英文
664-670
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）