The current in situ stress regime is of great significance to the exploration and development coalbed methane (CBM). In this study, vertical (), maximum horizontal principal minimum () Liupanshui Coalfield were studied. Variations envelopes trend lines lateral pressure coefficient with depth obtained, non-monotonic decrease permeability burial was determined. On basis, effect on coal reservoir ...

Abstract Based on analysis of a large data set and supplementary sampling for hazardous trace elements in coal samples from the Huainan Coalfield, generalized contrast-weighted scale index method was used to establish model evaluate grade cleanliness its regional distribution main seam (No. 13-1) The results showed that: (1) contents Cr, Mn Ni are relatively high average values greater than 20 ...

The Soutpansberg Coalfield hosts South Africa's hard coking coal reserves. However, coals in this region are understudied compared to other coalfields the country. This study characterizes properties of fine-float fraction samples extracted from a wide diameter borehole core Makhado Project, Tshipise sub-basin, coalfield. Conventional analyses were used determine quality, petrographic compositi...

Coal fires have been found to be a serious problem worldwide in coal mining reserves. Coal fires burn valuable coal reserves and lead to severe environmental degradation of the region. Moreover, coal fires can result in massive surface displacements due to the reduction in volume of the burning coal and can cause thermal effects in the adjacent rock mass particularly cracks and fissures. The Wu...

The Wuda coalfield, Inner Mongolia, China, has been suffering from serious coal fire disaster for more than half a century. In the past decade, central and local governments have carried out many fire-fighting projects to put fires, but fires still sporadically occur in coalfield. Previous studies showed that could release large amounts of mercury (Hg) into environment. Meanwhile, rapid industr...