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Numerical Simulation and In-situ Measurements of Reinforced Floor in Controlling Floor Heave of Soft Rock Roadway |
LI Xibing1, HE Tao1, YAO Jinrui2, MA Chunde1, HE Zhongguo2 |
1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;2. Guizhou Kailin Group, Guiyang 550302, China |
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Abstract: With the increase of depth in mining engineering, many support difficulties occurred in main development and preparation roadways in Maluping mining area of Guizhou Kailin Group. Traditional support technologies and measures failed to work. Problems in terms of the safety of the permanent roadways such as roof falling, rib spalling and floor heaving were often found, to require repetitive rebuilding work. To control and prevent the severe destruction of the surrounding rocks in the deep red shale roadway of Maluping mining area, in-situ investigations and theoretical analysis were carried out and an approach was put forward to control the floor heave by strengthening the floor. Meanwhile, three new improved support schemes were adopted on the basis of the original support scheme. The original scheme and these three improved schemes were simulated by using 3DEC, a discrete element code, and then in-situ tests were performed in a 100m long experimental roadway. Simulation results indicate that floor anchors can be used to control the floor heave by cutting the plastic sliding line located in floor corners. An improvement of floor toughness, integrity and bearing ability against the bulking pressure of rocks was achieved by placing steel meshes on the concrete floor. The in-situ test data show that the combined support scheme would reduce the floor heave by 83%, which has solved the support problem in Kailin Mine, that had been affecting the mine production for a long time.
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Received: 28 October 2011
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