Considerable fracturing occurs around the deep mine stopes because of the mining induced stresses superimposed on the high overburden stresses encountered at these depths. The frequency and orientation of fracturing is largely affected by the presence of geological structures, as well as the stope layout and mining configurations. Being able to accurately predict the effect of these interfaces ...

Methods for solving stochastic optimization problems by Monte-Carlo simulation are considered. The stoping and accuracy of the solutions is treated in a statistical manner, testing the hypothesis of optimality according to statistical criteria. A rule for adjusting the Monte-Carlo sample size is introduced to ensure the convergence and to find the solution of the stochastic optimization problem...

A reasonable and stable stope structure is the premise of realizing safe mining underground metal ore. To safely mine gently inclined medium-thick ore body, stability in Bainiuchang Mine was analyzed based on pillar area bearing theory, with regard to nine groups structural parameters numerically simulated. The results show that existing failed maintain requirements tended be exposed risk colla...

This study aims to determine the effectiveness of application project-based learning model football outcomes. The research method used is a True experiment with randomized posttest-only control group design. sample was 60 grade IX students SMPN 4 Ciawigebang, Kuningan Regency, divided into two groups an experimental class 30 and for group. sampling technique uses random cluster sampling. Resear...