科研之友
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摘要
Argillaceous rocks have long been selected as privileged host rock candidates for the nuclear waste disposal. For the sake of evaluating the sealing capacity of these natural barriers, one urgent issue is to study the poromechanical properties of them in the long-term gas migration process. As the key parameter of poroelasticity, Biot's tensor of argillaceous rocks should be firstly studied. In this paper, a series of poromechanical tests was firstly carried out to measure Biot's tensor components. 'Non-logical' values that Biot's tensor components were larger than unity (1.0) were obtained in the tests. It was then suspected that the process of injecting pore pressure is not a purely poromechanical problem. In order to deeper study about these values, complementary poromechanical tests were handed on two samples with helium and argon or helium and carbon dioxide (CO2), respectively, to confirm the adsorption-swelling phenomenon. The results showed that Biot's tensor components are obviously affected by the gases used, which is owing to their different adsorption capacities. To evaluate these swelling affect consequences, a series of permeability and triaxial compression tests was performed with different type of gases. The results obtained reveal that gas adsorption-swelling deeply effect the transport and (poro)mechanical properties of argillite.
- 出版日期2020-1-28
- 单位湖北工业大学
