Study on Optimization of Stope Structural Parameters and Filling Scheme of Wawu Phosphate Mine in Yichang City, China

Abstract

Reasonable stope structural parameters are very important to ensure the safety and efficiency of mining. In this paper, based on the elastic-plastic constitutive model of Mohr-Coulomb strength criterion, the reasonable span and critical span are calculated by using simply supported beam theory and mine room width calculation formula. PLAXIS2D finite element analysis software was used to conduct numerical simulation research on 7 m × 9 m, 5 m × 12 m stope structure parameter schemes and 7 m × 9m, 5 m × 12 m waste rock filling schemes. The optimal structure parameters of the stope were determined based on the calculation and analysis of displacement variation rule, surrounding rock stress distribution and plastic zone. The analysis and simulation results show that Case 1 one-time mining 7 m × 9 m and Case 3 one-time mining 5 m × 12 m, the plastic zone is connected, the simulation calculation is not convergent, and the stope is unstable. Case 2 waste rock filling 7 m × 9 m and Case 4 waste rock filling 5 m × 12 m, the distribution and change of stress, displacement and plastic zone in the goaf under the two cases are compared, and finally the waste rock filling 7 m × 9 m is obtained can improve the economy and safety of mining in the mining area, and verify the feasibility of implementing stope structural parameters and waste rock filling mining system is verified.

Research on Optimization and Numerical Simulation of Layout Scheme of Mining Approach in Downward Slicing and Filling Method

“…The optimal structure parameters were determined based on the calculation and analysis of displacement variation rule, surrounding rock stress distribution and plastic zone by Peng, G [26]. According to the calculation results of the model, the mechanical behavior characteristics of the backfill roof after excavation of the mining approach under…”

“…The optimal structure parameters were determined based on the calculation and analysis of displacement variation rule, surrounding rock stress distribution and plastic zone by Peng, G [26]. According to the calculation results of the model, the mechanical behavior characteristics of the backfill roof after excavation of the mining approach under different schemes are consistent, which is mainly reflected in the tensile stress concentrations and tension plastic zones of the roof directly above the mining approach, and the compressive stress concentrations and shear plastic zones of the two sides of the mining approach.…”

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

“…In order to assess the roof safety in the Halazi Iron Mine No.2 mining area under different mining widths, it is necessary to conduct an analysis using theoretical methods. The Mathews stability chart method is based on the rock mass classification system [ [20] , [21] , [22] ]. By collecting and analyzing a large amount of actual mining parameters, a stability chart was established, depicting the relationship between the rock mass stability index N and the shape coefficient S of the exposed mining face area [ 23 ].…”

Study of the Critical Safe Height of Goaf in Underground Metal Mines

“…Swift et al used an elastic beam model and a pillar strength formula to study the relationship between the exposed area of goaf, the pillar stability, and a safety factor [18]. Gao et al simulated the distribution and variation patterns of stress, displacement, and the plastic zone in goaf for different span ratios using the PLAXIS 2D finite element analysis software [19]. Zhienbayev, A. et al performed the calculations, modelling, and statistic analysis of factual rock falls from the roof to ensure the roof span stability in terms of room-and-pillar system of mining [20].…”