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Study on Supporting Parametric Optimizing Design and Evaluate Supporting Effect of Deep Roadway in Jinchuan Mine

LI Guang;MA Fengshan;LIU Gang;GUO Jie;GUO Huigao;KOU Yongyuan;Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences;Institutions of Earth Science,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Jinchuan Group Co.,Ltd.;  
The roadway support has always been a difficult problem in the mining engineering,especially in the deep soft rock roadway,whether it can provide endurable and effective support directly affects the safety production and sustainable development of the mine. The composite supporting scheme of double layer boltmesh-anchor and U-shaped steel is frequently used in the deep roadway in Jinchuan mining area. In order to evaluate the supporting effect of this scheme,a tentative roadway was setted up on the 814 m ramp in No. 2 mine. Through the combination of field monitoring and numerical simulation calculation,the supporting effect was evaluated,and an improvement measure was put forward. The results show that:(1)Under the present supporting conditions,the surrounding rock in the roof and both sides of the roadway are well controlled,but the floor heave is serious with the maximum displacement reaching 110 cm.(2)In view of the defects of the current supporting scheme,reinforcement measures,ranging from increasing the length of bolt,improving the strength of anchor rod to supporting the floor,were put forward.(3)An optimization scheme was designed,and the numerical simulation results show that the optimized supporting method can control the deformation of roadway surrounding rock effectively and solve the problems of the previous scheme.
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