Experimental Study on the Coupling Mechanism of Early-strength Backfill and Rock

2017 3rd International Conference on Energy, Environment and Materials Science

能源学;生态环境科学;材料科学

Wang, Mingxu^1

Wuhan University of Science and Technology, School of Resource and Environmental Engineering, Hubei Province, Wuhan

430081, China^1

关键词: Axial loading test;    Coupling mechanism;    Deformation abilities;    Interaction mechanisms;    Linear deformations;    Mechanical deformation;    Microscopic imaging;    Resistance strain gauges;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/94/1/012176/pdf
DOI  :  10.1088/1755-1315/94/1/012176

来源: IOP

【 摘 要 】

In order to study the interaction mechanism between the ore rock and backfill at the early stage, paraffin is chosen as the cementing agent. Based on the damage mechanics and fractal theory, the interaction mechanism between the ore rock and backfill is characterized by the relevant tests on the complex of proportioned ore rock and backfill with resistance strain gauge, crack propagation, microscopic imaging and AE. The experimental results showed that: 1) Through the axial loading test, compared with the early strength of the cemented filling and paraffin mechanical deformation characteristics, the stress and strain curves of the two had a common linear deformation law, while in the early strength of the filling elastic capacity strong, with a certain degree of resilience. 2) The bearing capacity of the backfill was weak, but the deformation ability was strong. During the bearing process, the deformation of the upper load was mainly caused by the ore rock, which leaded to the damage of the rock. 3) The distribution of AE points during the co-carrying of the filling and the ore rock was monitored by the acoustic emission instrument. The damage occurred mainly in the contact zone between the backfill and the ore rock zone. The corresponding AE point distribution also validated the crack happening.