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Controlled flow-rate gas injection experiments have been performed on pre-compacted samples of KBS-3 specification Mx80 1 buffer bentonite using helium as a safe replacement for hydrogen. By simultaneously applying a confining pressure and backpressure, specimens were isotropically-consolidated and fully water-saturated under predetermined effective stress conditions, before injecting gas using a syringe pump. Ingoing and outgoing gas fluxes were monitored. All tests exhibited a conspicuous threshold pressure for breakthrough, fractionally larger than the sum of the swelling pressure and the backpressure. All tests showed a post-peak negative transient leading to steady-state gas flow. Using a stepped history of flow rate, the flow law was shown to be nonlinear. With the injection pump stationary (i.e. zero applied flow rate), gas pressure declined with time to a finite value. When gas flow was re-established, the threshold value for gas breakthrough was found to be significantly lower than in virgin clay. There is strong evidence to suggest that the capillary threshold for gas entry is of such a magnitude that normal two-phase flow is impossible. Gas entry and breakthrough are therefore accompanied by the development of pathways which propagate through the clay from gas source to sink. In the absence of these pressure-induced pathways, initially water-saturated bentonite is impermeable to gas. |
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