Application of crosshole permeability test for characterization of hydraulic properties of jointed rock mass

In order to investigate the applicability of the crosshole permeability test for jointed rock mass, the in situ experiment was performed and following conclusions were obtained. Figure 10 Seismic wave paths which showed the remarkable attenuations of amplitudes and predominant flow paths 1) The three dimensional hydraulic properties could be evaluated by the crosshole permeability test, and their anisotropy was verified with the directional distributions of seismic velocities (i.e. the directional characteristic of joints in the rock mass). 2) As the distribution of highly permeable zone evaluated by the crosshole permeability test showed the good correspondence with that of joints in the rock mass estimated by the crosshole seismic tomography, therefore, the highly permeable zone could be considered to be detected by such crosshole permeability tests. It remains to be studied that highly permeable zones should be detected more accurately and reliably, and then the form of groundwater flow could be explicated to evaluate the hydraulic properties, by expanding such crosshole methods. (author)