ORALS

The method of stage vacant place and subsequent filling has been used in an iron mine in Anhui province, but the effect of underground filling with local cement is not good. Therefore, the cementitious material was developed which suitable for the actual situation of the mine. In this paper, the basic properties, fluidity of filling slurry and strength of filling body between local cement and cementitious materials are compared and studied. The experimental results show that the diffusion of filling slurry with new cementitious material is higher 37.93% than the filling slurry with local cement, and the compressive strength of filling body is higher 75.82% than the filling body with local cement. The testing indexes of the new cementitious material are better than the local cement. Therefore, the new cementitious material for mining can be well adapted to the cemented filling of tailings in this mine. Through the comparative experimental study in this paper, the data support and theoretical basis of performance evaluation and industrial application are provided for mine filling cementitious materials.

References:
[1] Tikov B, Mostafa B. Design and application of underground mine paste backfill technology[J]. Geotechnical and Geological Engineering, 2008, 26(2): 147−174.
[2] Yu Runcang. Development and innovation of cemented filling technology in China[J]. China Mine Engineering, 2010, 39(5): 1-3．
[3] Zhang Qinli, Wang Xin-ming. Hydraulic calculation of gravity transportation pipeline system for backfill slurry[J]. Journal of Central South University of Technology, 2008, 15(5):645−649.
[4] Wang Xinming, LI Jian-xiong, FAN Ping-zhi. Applied technique of the cemented fill with fly ash and fine sands[J].Journal of Central South University of Technology, 2001, 8(3):189−192.
[5] Zhang Qinli, Li Xieping, Yang Wei. Optimization of filling slurry ratio in a mine based on back-propagation neural network[J]. Journal of Central South University: Science and Technology，2013，44(7) : 2868-2874．
[6] Deng X，Mirzalan A．Competitive robot mapping homogeneous markers[J]. IEEE Trans on Robotics Automation, 1996, 12 ( 4) : 532-542．
[7] Jiang Xiuxiang, Bai Zhongmin. Study and practice on a new type of binder used in underground stope backfilling[J]. West-China Exploration Engineering, 2002, 14(5) : 71-72．
[8] Zhang Haijun, Chen Huaili, Liang Tingdong. Study on improving the early strength of filling[J]. Metal Mine, 2009: 284-286．
[9] Rudd M, Nagaratnam S. Geotechnical properties of cemented paste backfill from Cannington Mine, Australia[J]. Geotechnical and Geological Engineering, 2007(25): 383-393.
[10] Ercikdi B，Kesimal A，Cihangir F. Cemented paste backfill of sulphide-rich tailings: Importance of binder type and dosage[J]. Cement and Concrete Composites, 2009, 31(4): 268-274．
[11] Deng Daiqiang，Gao Yongtao，Wu Shunchuan. The multivariate analysis of cement classified tailings filling material with orthogonal experiment[J]. Journal of Shandong University of Science and Technology, 2010, 29(1) : 48-57．