As more easily mined deposits are depleted, the reserves are becoming more limited and less favorable. Deposits of coal or trona that are being longwall mined are deep and are getting deeper. Coal bursts and bumps frequently occur within development entries in longwall mining of deep mines due to high stresses. This paper presents a novel patented longwall mining layout “Longwall Mining with Sp...

This study, in a broad sense, fills in the missing parts in previous efforts at pullback stripping mode design with a dipping coal seam. Three different spoiling procedures have been developed: the normal mode, where the coal seam is flat/nearly flat; the uphill mode, where the coal seam is dipping and the dragline spoils uphill; and the downhill mode, where the coal seam is again dipping but t...

Fault coal bursts is a common type of in mining. With increases mining depths and intensities, the occurrence frequency disaster degree fault-controlled areas are increasing severity. Therefore, this article, mechanism control method deep mining-induced fault analysed on No. 3402 longwall panel controlled by two faults Shandong Mine, China. Based microseismic monitoring data panel, activation p...

Hydrocarbon wells drilled vertically through longwall coal pillars are vulnerable to severe deformation and potential failure as a result of underground coal mining. The lithology of the host rocks play a critical role in well stability. In this study, a two dimensional finite element method is employed to investigate the horizontal shear offset, vertical delamination, and compression at the we...

This study presents a dynamical model of the attitude angles boom-type roadheader, to reveal response characteristics in steep coal seam. Based on Lagrange equation, roadheader is established, then simulation system constructed Simulink, solve model. Afterwards, calculating method cutting load proposed, formulate external loads during process. Focused seam, which dip angle 30°, solved, and solv...

Observed crest speeds of maximally steep, breaking water waves are much slower than expected. Our fully nonlinear computations of unsteadily propagating deep water wave groups show that each wave crest approaching its maximum height slows down significantly and either breaks at this reduced speed, or accelerates forward unbroken. This previously noted crest slowdown behavior was validated as ge...

Gas disasters, such as coal and gas outburst overflow, always occur during the mining of steep extra-thick seam in horizontal, fully mechanized, top slice caving (HFMTCSC) method. To solve these issues guarantee safe efficient Yaojie No. 3 mine, 3DEC software was used this work to investigate overburden movement collapse law well stress redistribution coal-seam deformation characteristics below...

Periodic spontaneous erection and penile movements known as masturbation (SEAM) occur normally at approximately 90 min intervals in awake equids. SEAM in horses has traditionally been misunderstood by many horsemen as aberrant behavior that should be eliminated. Accordingly, it is not uncommon for trainers of performance stallions or managers of breeding stallions to punish SEAM in an attempt t...