Influence of structural factors on uniaxial compressive strength of cemented tailings backfill
Influence of structural factors on uniaxial compressive strength of cemented tailings backfill
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DOI：
10.1016/j.conbuildmat.2018.04.126
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发表时间：
2018-06-20
影响因子：
7.4
通讯作者：
Yilmaz, Erol
中科院分区：
文献类型：
--
作者：
Cao, Shuai;Song, Weidong;Yilmaz, Erol
以充填时间（FT）、充填间隔时间（FIT）和充填面角度（FSA）为主要研究参数，对尾砂胶结充填体单轴抗压强度（UCS）的影响进行了试验研究。在不同FT（1、2、3和4阶段）、FIT（12、24、36和48小时）和FSA（0、15、30、45和60度）下制备直径X高度为50 mm且高度为100 mm的多个CTB样品，并进行UCS测试以确定其机械强度性能。结果表明：（1）随着FTs的增加，CTB样品的抗压强度降低。该多项式能够定量地反映充填体强度与FT之间的关系。当CTB内的固体密度（SD）恒定时，强度折减系数k值随着FTs的增加而逐渐减小。当SD为65-75重量%时，k的相应值保持在0.592和0.967之间。(2)随着FIT的延长，CTB样品的UCS值逐渐降低。多项式函数可以定量描述UCS与FIT之间的关系。FIT仅轻微影响CTB样品的强度性能。随着FIT的增加，CTB试样的破坏模式可能是拉伸破坏-从拉伸破坏向剪切破坏的转变-拉伸剪切模式。(3)随着FSA的增加，UCS呈先减小后增大的U型分布。当FSA从0度改变到60度时，CTB样品的UCS首先减小，然后随着FSA增加。在这项研究中提出的结果有助于更好地了解结构因素对CTB的力学性能的影响。(C)2018爱思唯尔有限公司版权所有
In this paper, the influence of structural factors on the uniaxial compressive strength (UCS) of cemented tailings backfill (CTB) was experimentally investigated focusing on the filling time (FT), filling interval time (FIT) and filling surface angle (FSA). A number of CTB samples with a diameter x height of 50 mm and height of 100 mm were prepared at different FTs (1, 2, 3, and 4 stages), FITs (12, 24, 36, and 48 h), and FSAs (0, 15, 30, 45, and 60 degrees) and subjected to UCS test to determine their mechanical strength performance. Results show that: (1) The UCS of the CTB samples decreased with the increase in FTs. The polynomial could represent the quantitative relationship between the backfill strength and FT. When the solid density (SD) within the CTB was constant, the value of the strength reduction coefficient k gradually decreased with the increase in FTs. When the SD was 65-75 wt%, the corresponding value of k remained between 0.592 and 0.967. (2) With the extension of the FIT, the UCS values of the CTB samples gradually decreased. The polynomial function could characterize the quantitative relationship between the UCS and FIT. The FIT only slightly influenced the strength performance of the CTB samples. The failure mode of the CTB samples may be tensile failure-transition from tensile failure to the shear failure-tensile shear pattern with the increase in the FIT. (3) The UCS showed a U-type distribution that decreased first and then increased with the increase in the FSAs. When the FSA changed from 0 degrees to 60 degrees, the UCS of the CTB samples first decreased and then increased with the FSA. The results presented in this study contribute to a better understanding of the effect of structural factors on CTB's mechanical properties. (C) 2018 Elsevier Ltd. All rights reserved.