范各庄煤矿砂岩岩体结构数字识别及参数表征

ROCK MASS STRUCTURE DIGITAL RECOGNITION AND HYDRO-MECHANICAL PARAMETERS CHARACTERIZATION OF SANDSTONE IN FANGEZHUANG COAL MINE

借助先进的3GSM三维岩体不接触测量技术,对范各庄煤矿12煤底板砂岩岩体结构面进行现场测量,获取一系列真实描述岩体宏观结构的数字图像,提取节理几何形态空间分布信息,建立三维岩体结构面空间分布模型。在此基础上,得到砂岩岩体结构面联通网络,基于离散介质渗流方法和现场水文试验数据,建立岩体水力学参数表征方法,得到宏观岩体水力学参数,并分析参数的尺寸效应,实现岩体结构参数(几何形态)数字信息与水力学参数的定量表征有机衔接,为范各庄煤矿12煤底板砂岩岩体结构稳定性分析和突水危险性评价提供更加真实、可靠的数据支持。

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 .