To address the instability timing problem of residual coal pillars under mining disturbance, their stress migration law and mechanism were studied via numerical simulation, physical engineering tests considering remining in 3101 working face Shenghua Coal Industry. The results show that as progresses, concentrates on both sides remaining pillar empty roadway. When first front loses its bearing ...

Ukrainian electricity production sector is in a critical situation. It necessary to increase the coal ensure continuity of production. In this paper, an analysis mining western Donbas, Ukraine, was presented. The crucial thing region. new calculation schemes were proposed extraction Donbas mines. pillar parameters, which are for effective control rock pressure caused by stooping, substantiated....

Abstract Sustainability of an underground longwall operation is highly dependent on stability the pillars during panels extractions to ensure continuous serviceability gateroads. In Chinese mining, gateroads are typically driven as a single roadway with “long gateroad pillar” which different common practice where consists number known chain pillars. Such unique has been proven be more economica...

This paper gives an overview of the difficulties associated with the design of hard rock pillars in South African mines. Recent examples of large scale pillar collapses in South Africa suggest that these were caused by weak partings which traversed the pillars. Currently two different methods are used to determine the strength of pillars, namely, empirical equations derived from back analyses o...

The rapid scaling of integrated circuit requires further shrinkage of lateral device dimension, which correlates with pillar thickness in vertical structure. This paper investigates the effect of pillar thickness variation on vertical double gate MOSFET (VDGM) fabricated using oblique rotating ion implantation (ORI) method. For this purpose, several scenarios of silicon pillar thickness tsi wer...

Mining-induced subsidence is critical for ecological environment reconstruction and damage prevention in coal mining areas. Understanding the characteristics of surface with multi-seam first step. Surface different panel layout configurations was investigated by means UDEC numerical simulation. Based on simulation results, it indicated that configuration had a significant impact subsidence, inc...

The disturbance depth of traffic load has a direct impact on the stability room-and-pillar mining goaf. To quantitatively calculate relationship between and influencing factors, 49 groups horizontal combinations different parameters are designed in this study, based orthogonal experimental design method. Midas GTS is used to simulate obtain corresponding data. A multivariate linear regression a...

this paper gives an overview of the difficulties associated with the design of hard rock pillars in south african mines. recent examples of large scale pillar collapses in south africa suggest that these were caused by weak partings which traversed the pillars. currently two different methods are used to determine the strength of pillars, namely, empirical equations derived from back analyses o...