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Reasonable support form and support parameters are the key to ensuring the stability of the roadway surrounding rock. The joint support effect of bolt + metal mesh + shot grouting in the Grade IV surrounding rock area of the drainage roadway of Julong Copper Mine in Xizang is poor. In this paper, for the problems of support in the Grade IV surrounding rock area of the drainage roadway of Julong Copper Mine, bolt and steel arch support, as well as the thickness of shot grouting, is introduced on the basis of the existing support. Different bolt support parameters are designed and optimized using finite element numerical simulation software. The results show that there is an obvious stress addition phenomenon at the roadway surrounding rock roof. With the increase of bolt support parameters, the maximum stress value at the roadway roof increases. With the increase of row spacing between bolts, the maximum displacement of the roadway roof increases, the bolt spacing increases from 1.2 m to 2.0 m, and the displacement of the roadway roof is 4 mm, 4.38 mm, and 4.82 mm, respectively. The optimal support parameter of the bolts is 1.6 m x 2.4 m. The results of the study provide theoretical references for the selection of the support parameters of the bolts of similar roadways. [ABSTRACT FROM AUTHOR]

Rainfall infiltration can cause a decrease in the strength of the rock and soil mass on the dump slope, increase the bulk density of the upper rock and soil mass, and reduce the stability of the slope. This paper takes a mine dump slope as the background, and uses GeoStudio software to simulate and analyze the pore water pressure characteristics and safety factors under different rainfall durations. The simulation results indicate that as the duration of rainfall increases, the limit value of pore water pressure continuously increases, and the pore water pressure increases towards the top of the slope, while the corresponding safety factor decreases. The study provides references for the stability of the dump slope in the mine. [ABSTRACT FROM AUTHOR]