Assessment of Hydraulic EDZ around the URL Cavern by In-Situ Test and DFN Model Analysis
Stress re-distribution may occur by excavation around an excavated cavern, and it is important to correctly identify subsequent mechanical and hydraulic change in the Excavation Disturbed Zone (EDZ) so as to produce a reliable safety assessment. In this paper, we introduce the results of application of a specially designed device for detecting a hydraulic EDZ to one of the fractured rock cavern of a Talc mine in Korea. It was observed that the hydraulic EDZ ranges to the limited distance of 1～2m from the cavern wall, and hydraulic conductivities of the EDZ were orders of magnitude higher than those of undisturbed region. Flow through the connected fractures within EDZ was represented by Discrete Fracture Network (DFN) model, and the validity of the flow model was evaluated by comparing in-situ measurement and numerical borehole hydraulic test using the constructed DFN model.
H.M.Kim D.W.Ryu J.H.Synn
Korea Institute of Geosdence and Mineral Resources, Daejeon, Korea
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）