ARMA 12-226 Simplified approach of gas production effect on nuclear waste repository stability

摘要

In the context of feasibility study for nuclear waste disposal, numerical modelling of the underground facilities construction is necessary in order to study the different physical processes occurring during the live-time of the nuclear waste. This paper consists to study the gas-mechanical coupling effect on a claystone using a mechanical model coupled with a two-phase flow model formulated in the framework of Biot theory. A two dimensional simplified geometry is studied. Pore pressure evolution and plastic deformations evolution during gas injection in the different components will be discussed. Comparison between calculations performed with and without gas allow us to draw some conclusion on the gas coupling effect on such low permeable materials.