Rock Mechanics Characteristics Test and Optimization of High-Efficiency Mining in Dajishan Tungsten Mine

Abstract

Rock mechanics test is not only the basis for obtaining the mechanical parameters of rock but also an important means for studying rock mechanics and engineering. In this paper, the uniaxial compression deformation test, Brazilian splitting test, and cornea pressure shear test are carried out for rocks in the Dajishan tungsten mine. The basic mechanical parameters such as uniaxial compressive strength, tensile strength, elastic modulus, Poisson’s ratio, and internal friction angle of ore rock and surrounding rock are obtained. Meanwhile, damage characteristics of rock are deeply studied and analyzed under different experimental conditions. According to rock mechanics parameters which are obtained from indoor rock mechanics tests, three design schemes of stope structure parameters are optimized by using the FLAC3D numerical simulation software. On the premise of ensuring the stability of the stope structure, the recovery rate of ore and the production capacity of the stope are taken into consideration. It is suggested that the second scheme should be adopted for mines (18 m for ore room and 7 m for ore pillar), which provides scientific guidance for the safe and efficient mining of mines.

Blastability and Ore Grade Assessment from Drill Monitoring for Open Pit Applications

“…Rock mass is a combination of materials with different mechanical properties, intersected by discontinuities. Rock mechanical properties normally refer to strength (uniaxial compressive strength, UCS), deformation (Young's modulus and Poisson's ratio, assuming that the rock mass is an isotropic linear elastic body) and stability characteristics (cohesion and friction angle) (Zhao et al 2018;Aydan et al 2014). These features are normally obtained by laboratory experiments of core samples from intact rock or by in situ tests and describe the general mechanical characteristics of the rock type/s that compose the deposit.…”

Stability of stope structure under different mining methods

“…For example, T. M. Ermekovtakes [7] mine engineering obtains the key parts of pillar instability in the goaf and then analyzes the goaf stability. Zhao et al [8][9][10], used FLAC 3D numerical simulation technology on the basis of the optimization of the mining scheme in Dajishan Tungsten Mine. They obtained the alternative and one mining schemes, which are further conducive to stope stability and can improve the stope production capacity.…”

Optimization of stope structure parameters by combining Mathews stability chart method with numerical analysis in Halazi iron mine

“…According to numerous studies conducted both domestically and internationally, it has been shown that the size of the grid cells is one of the important factors affecting the computational results when using FLAC3D for simulation research [ 29 , 30 ]. In this study, a tetrahedral grid partitioning method was employed for the construction of the model, with the following specifications: For the main research area, the grid cell size in the vertical direction and along the vertical ore body trend was set to 1.5 m. The adjacent region to the ore body, which can be considered as a transition zone, had grid cells with sizes ranging from approximately 3 m–5 m. Outside the transition zone, where the grid cell sizes ranged from approximately 5 m–22 m. The cell sizes gradually transitioned radially from the inner area to the outer area in a radiating distribution pattern.…”