Experimental research on mechanical properties of combinedcemented tailings backfill and its application

被引：0
作者：
Cao S. [1 ,2 ]
Xue G. [1 ,2 ]
Song W. [1 ,2 ]
机构：
[1] State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education, Beijing
[2] School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 03期
关键词：
Cement-to-tailings ratio; Combined cemented tailings backfill (CCTB); Mechanical characteristics; Numerical simulation; Trial stope;
D O I：
10.13545/j.cnki.jmse.2019.03.022
中图分类号：
学科分类号：
摘要：
In order to explore the mechanical properties and failure modes of combined cemented tailings backfill (CTB), the three-layered columnar composite CTB samples with the C/Ts of 1: 4, 1: 6, 1: 8 and 1: 10 respectively are prepared from the tailings from Daye Iron Mine to test the CTB under uniaxial compression, with the aid of SANS digital display equipment. With Daye Iron Mine as engineering background, the filling scheme is optimized by means of numerical simulation and the industrial experiment is carried out. The results have shown that: 1) when the top and bottom stratification of the composite CTB is 1: 4, the C/T of the second layer of CTB will decrease with the overall strength of the CTB ob viously weakened. When the ratio of the second layer is 1: 10, the C/T of the top layer decreases. The overall strength of the CTB will gradually decrease and the impact is small. Furthermore, the failure mode of the composite CTB is mainly manifested as the first failure in the middle part, then the top and the bottom part destruct with the tensile and shear. 2) The C/T ratio of 1: 4 in the goaf of -171~-159m and 1: 8 of -159~-120m is optimal scheme, and the coring strength of on-site filling body is better. The research results have been successfully applied to the pillar 309 in the trial stope, achieving a good technical index of recovery rate of 92.14% and dilution rate of 9.07%. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：601 / 608
页数：7
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