the mathematical modeling of fracture networks is critical for the exploration and development ofnatural resources. fractures can help the production of petroleum, water, and geothermal energy. theyalso greatly influence the drainage and production of methane gas from coal beds. orientation andspatial distribution of fractures in rocks are important factors in controlling fluid flow. the object...

A common task in coal exploration is evaluating reserves by estimating some form of isopach map. Available machine-contouring packages, because of their gridding/contouring sequence, are generally unsatisfactory for this purpose. A different approach considers an isopach map as the difference between two complete digital models of the upper and lower surfaces involved. In addition, whereas a to...

Current efforts at ‘low-carbon transition’ are marked by a striking paradox: the ‘phenomenal’ and ‘historically incredible’ resurgence of coal. Exploration of the source of this conundrum opens up an analysis of current trends regarding low-carbon energy transitions in terms of the forging and emergence of ‘cosmopolitan climate risk communities’. Such an analysis is a case study in a broader sh...

two roadways in adjacent working face of Baode Mine may have the risk water inrush at same time, so it is necessary to construct long borehole cover roadway excavation. On basis hydrogeological conditions mine, safe insulation thickness and coefficient coal seam No .8 are calculated. The results show that 0.035-0.037 MPa/m, which less than critical value 0.06 MPa/m bottom plate has no sudden ha...

the volumetric changes in the coal matrix (coal shrinkage), permeability under various gas environment conditions as well as perographical properties were studied in the laboratory. the shrinkage and permeability of coal were examined with respect to changing gas type and confining pressures. the shrinkage tests were carried out in high-pressure bombs while the permeability study was conducted ...

The need for reliable maps of subterranean spaces too hazardous for humans to occupy has motivated the development of robotic mapping tools. For such systems to be fully autonomous, they must be able to deal with all varieties of subterranean environments, including those containing loops. This paper presents an approach for an autonomous mobile robot to determine if the area currently being ex...

The Outburst can be defined as a sudden release of coal and rock accompanied by large quantities of gas into the underground coal mine workings which represents a major hazard in underground coal mines. Gas drainage has been proven to be successful in reducing outburst hazards by decreasing the in-situ gas pressure. One of aspect of gas drainage from coal seams is coal matrix volume changes. Cu...