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Title: Estimating hydraulic conductivity of highly disturbed clastic rocks in Taiwan
Authors: Cheng-Yu Ku;Shih-Meng Hsu
Contributors: NTOU:Department of Harbor and River Engineering
Keywords: Hydraulic conductivity;Borehole acoustic televiewer;Double packer system;Sedimentary rocks;Rock mas
Date: 2010
Issue Date: 2011-10-20T08:13:57Z
Publisher: InTech Press
Abstract: abstract:Understanding groundwater flow in fractured consolidated media has long been important when undertaking engineering tasks such as dam construction, mine development, the abstraction of petroleum, slope stabilization, and the construction of foundations. To study groundwater flow in support of these tasks, the focus of most hydrogeological investigations has been on the characterization of the hydraulic properties of the higher-permeability fractures in the rock mass. Taiwan is situated on the edge of the Eurasian and Philippine Sea plate. Plate tectonics have created numerous fault lines that crisscross the island. As a result of high density of faults, rock core data with fractures, soft and cohesive gouges, and various lithologies are extensive in boreholes. In general, the permeability of clay-rich gouges has extremely low values. On the contrary, the fractures often have higher permeability. The hydraulic properties of fractured rocks in Taiwan, therefore, vary with highly disturbed geological structures and lithology. To obtain hydraulic properties of fractured rocks in Taiwan, the investigation of vertical variation of the fractures in a borehole is of importance. This study utilized a high-resolution BoreHole acoustic TeleViewer (BHTV, Williams, 2004) to scan images of the borehole. The information gathered from BHTV was used to characterize lithology and fractures for the borehole and was essential to conduct a proper measurement of rock mass hydraulic conductivity. The double packer systems were then used to determine the hydraulic conductivity in a portion of borehole using two inflatable packers. Although this type of test can directly measure the hydraulic parameter, costs of the testing are fairly high. Several studies (Black, 1987; Carlson and Olsson,1977; Louis, 1974; Burgess, 1977; Wei et al., 1995, Zhao, 1998) have proposed the estimation of rock mass hydraulic conductivity using different empirical equations. These empirical equations provide a gr
Relation: pp.267-285
Appears in Collections:[Department of Harbor and River Engineering] Periodical Articles

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