Underground longwall mining can seriously disturb the surrounding rock masses above panel. A surface cracking zone, continuous deformation fractured and caved zone be formed in overlying strata (termed “four zones”), which may further result spontaneous combustion of coal seams water inrush. It is essential to study predict development characteristics four zones induced by guarantee safety. The...

Longwall mining is the only technically proven and established method worldwide for coal extraction at greater depth. In this paper, 2D plane strain finite element models of longwall panels are developed and analyzed to understand the interaction of hydraulic powered support with surrounding rock strata. Based on Indian geomining conditions, finite element models are developed including the str...

Reduction in the recovery time required and improvements in safety during a longwall face move have compelled coal mine operators to examine and use predriven longwall recovery rooms. The recovery entry is developed at the longwall stop position and supported ahead of time so that the required combinations of standing and internal supports can be installed before the longwall face approaches. A...

This paper describes the adoption of the Ethernet/IP standard in the development of a specification for the interconnection of mining equipment as part of an industry-sponsored Landmark longwall automation project. Longwall mining is used extensively worldwide and accounts for the majority of underground coal production in Australia and the USA. Full automation of the longwall mining process is...

Underground longwall mining of coal causes large scale disturbance of the surrounding rock mass. The disturbance can increase the rock mass permeability through a reduction on the stress as well as formation of new fractures in the rock. Methane gas contained in the disturbed rock mass can migrate towards the low pressure mine workings and present an explosion hazard. This paper describes the a...

Compared to opencut mining, underground coal mining is more common in Australia due to its lesser impact on the environment. Although there are several underground mining methods, such as the longwall, pillar, bord, and miniwall, longwall mining is the most commonly used method due to its high efficiency. However, longwall mining does lead to significant ground subsidence. Mining subsidence is ...

Considering the factors affecting surrounding rock stability of gob-side entry retaining, applicability a large-diameter, concrete-filled steel tube roadside support body in top-coal caving fully mechanized face is discussed, and new approach to retaining proposed this study. The mechanical model structure was established, critical state column–roof contact shear slip instability clarified thro...

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...