A Numerical Simulation Model and a Software of Using Ground Temperature to Predict Water Inrush from Heterogeneous Porou
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ORIGINAL PAPER
A Numerical Simulation Model and a Software of Using Ground Temperature to Predict Water Inrush from Heterogeneous Porous Rocks Ruiai Nie . Meiyan Li . Jie Yu . Yingjun Fu . Chuanpeng Gao
Received: 13 January 2020 / Accepted: 13 April 2020 Ó Springer Nature Switzerland AG 2020
Abstract Water inrush in deep mines is a major problem due to the complicated geological conditions of high water pressure, high stress, and high ground temperature. Because the high ground water and high ground stress have great influence on ground temperature distribution, the temperature change can be used to predict water inrush. In order to use ground temperature to predict water inrush from porous rock under thermal–hydraulic–mechanical (THM) coupling geological environments and simplify the process of establishing THM coupling model, a numerical simulation model specialized for using ground temperature to predict water inrush was established and a software specialized for establishing this model was developed by the secondary development of COMSOL Multiphysics. The temperature change law were studied under the impacts of the interaction of the water pressure, working face length, the geothermal gradient, and fault dip angle. Results indicate that the temperature in porous rock increases with increasing geothermal gradient, water pressure and fault dip angle, and decreases with increasing working face length. The ground temperature is higher in the heterogeneous porous media than in the homogeneous. At high water pressure, the temperature change
R. Nie M. Li (&) J. Yu Y. Fu C. Gao College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China e-mail: [email protected]
is very large especially at the first few advancing steps of working face, which can provide an obvious temperature change to predict water inrush from porous rock. The software can provide a more convenient method to establish this model and use ground temperature to predict water inrush from porous rock. Keywords Secondary development Water inrush Ground temperature Heterogeneous porous rock
1 Introduction Water inrush is a major threat to underground engineering, especially to coal mining. One of the essential conditions of water inrush is water inrush channel, such as fault and collapse column. Water inrush is more likely to occur under the interaction of high ground temperature, high ground water pressure, and high ground stress in deep mines. Therefore, it is necessary to establish a thermal–hydraulic–mechanical (THM) coupling model to predict water inrush. The framework of international projects like DECOVALEX has dramatically promoted the study of the THM coupling process (Bond et al. 2017; Jing et al. 1995; Rutqvist et al. 2002; Tsang et al. 2005). In recent years, Xiao et al. (2018) developed a THM coupling model to simulate the combined effect of fracture fluid flow and analyze the stability of the matrix. Sun et al.
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Geotech
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