Geological discontinues in the coalbed, such as faults, sandstone channels, permeability facies, lithotype changes, and large scale partings in the coal seam, can cause intermittent production problems or produce unexpected amounts of water or gas from degasification boreholes. These discontinuities not only can impact methane emissions into the mine workings, especially if they hinder proper a...

In this paper we describe the development of a three-dimensional (3D) imaging system for a 3500 tonne mining machine (dragline). Draglines are large walking cranes used for removing the dirt that covers a coal seam. Our group has been developing a dragline swing automation system since 1994. The system so far has been “blind” to its external environment. The work presented in this paper attempt...

High-resolution seismic reflection methods were instrumental in characterizing a coalbed methane prospect estimated to have the potential to produce sufficient methane to satisfy the municipal needs of rural Fort Yukon, Alaska. Reflections with upper corner frequencies over 200 Hz and dominant frequencies over 150 Hz were recorded sitewide. Over a dozen uniquely distinguishable reflections are ...

In order to solve the dust treatment problem of coal Permian extra thick seam mined by Tashan Coal Mine, comprehensive technology research was carried out with 8106 discharge face and 8210 Mine as geological background, four aspects water injection process, determination parameters, inspection reduction effect application promotion prospects were analyzed studied.

Background: Coal mining requires safe and effective roadway support to ensure production worker safety. Anchor is a common method used for controlling the roof of coal seams. This study aims analyze effectiveness different anchor schemes provide theoretical basis designing support. Methods: The authors computer simulation tool called FLAC3D simulate spacing between bolts, bolt length, cable con...

Purpose. Based on high-pressure gas injection technology that enhances coal seam drainage, the effect of CH4 replacement with CO2 in aquiferous has been studied. Methods. Using laboratory experimental method and self-built device, is injected into different moisture contents to replace under adsorption equilibrium pressures. Findings. With an increase content, capacity for gradually weakens, al...

The article deals with possibilities of utilization of the designed and developed BilPol software system that extremely facilitates, accelerates and specifies the very important initial stage of estimation of coal reserves. The system quickly and transparently compiles and illustrates logs of boreholes and cuttings with indicated seams and benches. In the user-friendly and intuitive graphic env...