Estimates for the local permeability of the Cobourg limestone

作     者：A.P.S.Selvadurai A.Glowacki 

作者机构：Department of Civil Engineering and Applied MechanicsMcGill UniversityMontréalQCH3A 0C3Canada 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2018年第10卷第6期

页      面：1009-1019页

核心收录：

学科分类：07[理学] 

基　　金：supported by NSERC Discovery the studentship support provided by a McGill Engineering Doctoral Award, FQRNT and the SAAQ 

主　　题：Cobourg limestone Permeability Steady state tests Hydraulic pulse tests 

摘      要：Argillaceous limestone formations are being proposed as sites suitable for constructing a deep geologic repository for storing low-to intermediate-level nuclear waste in southern Ontario, Canada. The Cobourg limestone is characterized by a visual appearance of heterogeneity resulting from light gray calcite nodular regions interspersed with dark gray calcite-dolomite-quartz partings containing a clay component. This paper presents the results of experiments conducted to determine the permeability of both the light gray and the dark gray species of the Cobourg limestone. The permeabilities were successfully estimated from both steady state and hydraulic pulse tests conducted using specially designed miniature water entry ports, which were epoxied to the surface of the rock sample containing cavities drilled into the rock species of interest. The results show that the dark gray species of the Cobourg limestone has a permeability that is roughly one order of magnitude greater than the light gray calcite species.