Mechanical stability of engineered barriers in a subsurface disposal facility during gas migration based on coupled hydromechanical modelling
Published:January 01, 2015
Shuichi Yamamoto, Mamoru Kumagai, Kazumasa Koga, Shin Sato, 2015. "Mechanical stability of engineered barriers in a subsurface disposal facility during gas migration based on coupled hydromechanical modelling", Gas Generation and Migration in Deep Geological Radioactive Waste Repositories, R. P. Shaw
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The ‘subsurface disposal’ concept has been proposed for relatively higher-activity low-level waste (LLW) in Japan. This concept includes a low-permeability layer (LPL) made of bentonite material and a low-diffusion layer (LDL) made of dense cementitious material. The influence of gas generation and migration on the mechanical stability of the engineered barrier system (EBS) is one of the issues for long-term performance assessment of the disposal facility. In this study, coupled hydromechanical modelling and analyses are carried out in order to evaluate the mechanical stability of the system. Two gas generation rate cases are simulated: (1) a reference case; and...
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Gas Generation and Migration in Deep Geological Radioactive Waste Repositories
Understanding the behaviour of gases in the context of radioactive waste disposal is a fundamental requirement in developing a safety case for the disposal of radioactive waste. Of particular importance are the long-term performance of bentonite buffers and cement-based backfill materials that may be used to encapsulate and surround the waste in a repository, and the behaviour of plastic clays, indurated mudrocks and crystalline formations that may be the host rocks for a repository. The EC Euratom programme funded project, FORGE, has provided new insights into the processes and mechanisms governing gas generation and migration with the aim of reducing uncertainty. This volume brings together papers on aspects of this topic arising from both the FORGE project and work undertaken elsewhere. This has been achieved by the acquisition of new experimental data coupled with modelling, through a series of laboratory and field-scale experiments performed at a number of underground research laboratories throughout Europe.