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Abstract A large similar physical model experiment system for mechanism of deep mining water inrush with high pressure is developed. The system is composed of model box，loading devices of horizontal lateral pressure and vertical pressure，measurement devices and data autorecorder. The dimension of the model box can vary with the practice. It is designed as 1 600 mm in length，800 mm in height and 200 mm in width here. The horizontal and vertical pressures are applied by closed circuit servo-loading devices with a maximum charge of 300 kN. The maximum horizontal displacement is limited in 100 mm，while 1.0 MPa of water pressure can be added to simulate fluid-solid coupling effects. The measurement devices include the stereo microscope to record and measure the development of cracks in the specimen，and the advanced measurement device to monitor and measure the displacements based on digital image analysis. This large similar model experiment system can simulate the complicated mining activities and help to analyze the stresses，deformation(displacements) and failures in surrounding rock. The safety effects of different loading conditions，water pressures and mining engineering and the mechanisms of water inrush caused by mining engineering can be studied. It is certainly a new and valuable modeling and testing research platform for studies of both water inrush in coal mines and related mechanical problems in deep mining engineering.
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Received: 06 October 2008
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