|
Abstract A 3D contact-free measuring system(3GSM) is employed to acquire the geometrical information of rock mass structures of sandstone in the 12th coal seam floor of Fangezhuang coal mine. A series of digital images of rock mass surface are captured by the system. And then the spatial distributed information of the geometric configuration of joints is extracted from the images to rebuild the 3D digitized fracture network of rock mass；and the connectivity of the fracture network is identified. On the basis，the characterization method of hydraulic parameters of rock mass is established based on the discrete medium mechanical model and in-situ data. By using this method，hydraulic parameters of sandstone in the 12th coal seam floor are determined；and the size effect of the parameters is also studied. The works can realize the optimum connection between the digital information of rock mass structures and the quantitative determination of hydraulic parameters，so as to provide more reliable basic data for the stability analysis of rock engineering and risk evaluation of water inrush of the 12th seam floor in Fangezhuang coal mine.
|
|
Received: 30 March 2009
|
|
|
|
