Effect of layer thickness on the flexural property and microstructure of 3D-printed rhomboid polymer-reinforced cemented tailing composites  

作　　者：Ziyue Zhao Shuai Cao Erol Yilmaz 

机构地区：[1]State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education,University of Science and Technology Beijing,Beijing 100083,China [2]School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China [3]Department of Civil Engineering,Geotechnical Division,Recep Tayyip Erdoğan University,Fener,Rize TR53100,Turkey

出　　处：《International Journal of Minerals,Metallurgy and Materials》2023年第2期236-249,共14页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(No.2022YFC2905004);the National Natural Science Foundation of China(No.51804017)。

摘　　要：For mines with poor ore bodies and surrounding rocks,the general mining method does not allow the ore to be extracted from underground safely and efficiently.For these mines,the downward layered filling mining technique is undoubtedly the most suitable mining method.The downward filling mining technique may eliminate the troubles relating to poor ore deposit conditions,such as production safety,ore loss rate,and depletion rate.However,in this technique,the safety of the artificial roof of the next stratum is of paramount importance.Cementitious tailings backfilling(CTB)that is not sufficiently cemented and causes collapses could threaten ore production.This paper explores a diamond-shaped composite structure to mimic the stability of a glued false roof in an actual infill mine based on the recently emerged three-dimensional(3D)printing technology.Experimental means such as three-point bending and digital image correlation(DIC)techniques were used to explore the flexural characteristics of 3D construction specimens and CTB combinations with different cement/tailings weight ratios at diverse layer heights.The results show that the 3D structure with a 14-mm ply height and CTB has strong flexural characteristics,with a maximum deflection value of 30.1 mm,while the 3D-printed rhomboid polymer(3D-PRP)structure with a 26-mm ply height is slightly worse in terms of flexural strength characteristics,but it has a higher maximum flexural strength of 2.83 MPa.A combination of 3D structure and CTB has more unique mechanical properties than CTB itself.This research work offers practical knowledge on the artificial roof performance of the downward layered filling mining technique and builds a scientific knowledge base regarding the successful application of CTB material in mines.

关 键 词：tailings cemented fills 3D printed rhomboidal polymer three-point bending test digital image correlation 

分 类 号：TB33[一般工业技术—材料科学与工程]