Pillar is a part of the deposition excavated material that left behind to sustain rock weight above it. The aim this study was determine effect height and diameter ratio on strength pillar obtained from uniaxial compressive testing numerical modeling. Laboratory test results showed pillars with 1.5 H/D did not show an increase in 1.83%, while 1 gave more significant strength, which 32.99%. mode...

Abstract Pillar stability guidelines have been presented by numerous authors in the past, based on a combination of empirical observations (mostly visual) from mining applications and simple numerical (elastic or continuum plasticity) models. In many cases, resulting design limits for pillar dimensioning are as universal all rockmass conditions stress regimes. There developments past decades me...

Civil engineering projects have greatly benefited from the mechanical excavation of hard rock technology. Mining industry, on the other hand, is still searching for major breakthroughs to mechanize and then automate the winning of ore and drivage of access tunnels in its metalliferrous sector. The aim of this study is to extend the scope of drag bits for roadheaders in hard rock cutting. Variou...

Different from single coal seam mining, the stress evolution in end mining stage of close-distance seams is extremely complex. The unreasonable position and support lower retracement channel will cause serious deformation damage to surrounding rock. Taking Yanzishan mine as engineering background, failure characteristics under different overlay environments key influencing factors design were d...

Hard rock aquifers for the purpose of this Paper mean the non-carbonate, fractured rock aquifers in the terrain covered by crystalline basement complex, metamorphic rocks and also by extensive effusive volcanic rocks like the basalts of western India (Deccan traps. Ground water development in hard rock aquifer areas has always played a secondary role compared to that in the areas having high-yi...

This paper is based on the open pit to underground mining practice of Daye Iron Mine. The influence mechanism between high-steep slope and non-pillar sublevel caving method is studied by using physical model test. Firstly, engineering geological properties of the choosing typical research section is analysed and generalized. Secondly, the system of open pit to underground mining is developing a...