Grounding pressure distribution on pillars in sedimentary rocks

Abstract

The results of investigations on pressure distribution both on belt pillars and soil of adjacent mined-out areas are cited when sedimentary type flat and sloping deposits are mined by subsurface operations. As a result of the analysis of mine instrumental measurements and equivalent materials modeling the tangent pressure angle dependence from the ratio of vertical geostatic pressure to average rock mass strength is determined. The equations are set up for solving the task of pressure distribution on pillars of different width having elastic area and sites with limiting conditions or being completely in limiting state. The influence of time factor is taken into account. The obtained results permit to perform a more reliable estimation of the pillars state depending on their width and adjacent mined-out areas dimensions with due regard for key mining-geological and mining-technical factors.

Keywords

• горное давление
• целики
• область предельного состояния
• упругая область
• confining
• pressure
• pillars
• the region limit state
• the elastic area