There are two major design problems for upper seam longwall gateroads operating in a multi-seam environment. The first is to determine the location, magnitude and duration of stress transferred from lower seam mines; and the second is to predict the effect of stress transferred from lower seam mines on opening stability. To solve these problems for both longwall and room-and-pillar mines, case ...

In industrial assembly lines, seam sealing is a painting process used for making watertight seals or for preventing rusting. In the process, sealant is painted on seams located at the joints of pressed metal parts. We developed a sealing robot system that adjusts the sealing gun motion adaptively to the seam position sensed by a range sensor (a scanning laser rangefinder which senses profile ra...

A series of experiments were performed to determine rock mechanical parameters related to was studied. Experimental results show that the coal seam in the study areas has a relatively low elastic modulus, high Poisson’s ratio, high fragility and is easily broken and compressed. The coal seam is considered as a transversely isotropic medium, since the physical properties in the direction of bedd...

Process monitoring is important for the laser welding system, especially for the weld seam deviation monitoring. A 10kW high power fiber laser butt joint welding of type 304 stainless steel was performed. By combing two different band pass filters, high speed photography was employed to capture the near-infrared images of molten pools. Image difference algorithm was used to obtain the weld seam...

This paper attempts to predict the surface subsidence induced by multi-seam longwall mining in PT Gerbang Daya Mandiri (GDM) underground coal mine Indonesia. Several numerical models of under various depths were built finite difference code software “FLAC3D” which was used as a tool for simulations. Effect sequence and influence lower seam firstly investigated. The angle draw (AoD) maximum (Sma...

PT.X, a coal mining company in South Kalimantan, Indonesia, plans to use the highwall method excavate marginal reserves on final slope maintain production. However, stability of and determination dimensions are major concerns due unfavourable rock mass conditions caused by intensive weathering tectonics. This paper aims evaluate feasibility study area using empirical, analytical numerical metho...

In mining of inclined coal seams in Tangshan coal mine of Kailuan group, gateways on either end of a panel were both typically located along the floor and a gateway pillar between adjoining panels was left unmined between adjacent panels to ensure stability, thus forming a planar mining system. According to the practice, however, it turned out that this conventional mining system has long-stand...

Slicing fully mechanized caving mining is a standard high-efficiency method for ultrathick coal seams. However, the effectiveness of gas control has accentuated difficulty in top low-permeability This study focused on No. 9-15 Liuhuanggou Coal Mine, Xinjiang Province, China. To this aim, results theoretical analyses and field tests were combined to explore comprehensive The (9-15)06 panel was t...

thermal decomposition of two coal samples obtained from top seam sibi (tss) and sore range quetta (srq) coal fields in their raw and acid washed forms were carried out in an open type tubular pyrolyzer coupled to a gas chromatograph with fid. elemental analyses were carried out with scanning electron microscope-energy dispersive x-rays (sem-edx) analyzer. effect of inherent mineral contents on ...

Epithelial cell shape changes underlie important events in animal development. During the postembryonic life of the nematode Caenorhabditis elegans, stem epidermal seam cells lose and actively renew mutual adherens junction contacts after each asymmetric division that separates them. The seam cell contacts are important for epidermal differentiation, but what regulates the cell-shape changes th...