The methods of numerical simulation and on-site measurement is used to analysis reasonable coal pillar width (CPW) roadway support in isolated panel extra-thick seam. Numerical modeling shows that a maximum vertical stress 32.9 MPa, concentration factor reaches 2.99, which more affected by the mining adjacent panel, peak on both sides higher. By comparing failure deformation characteristics dif...

In order to study the coal pillar stability of gob-side entry in gently inclined seam, a comprehensive method including theoretical analysis, numerical modeling, and field monitoring was applied its fracturing instability mechanism. The results show that uneven horizontal stress internal cause asymmetric deformation failure seam. rotation movement main roof distribution were closely related inc...

Different from single coal seam mining, the stress evolution in end mining stage of close-distance seams is extremely complex. The unreasonable position and support lower retracement channel will cause serious deformation damage to surrounding rock. Taking Yanzishan mine as engineering background, failure characteristics under different overlay environments key influencing factors design were d...

Theoretical analysis and numerical simulation were conducted to study the disaster-causing mechanism of structural instability overlying strata induced by water–rock coupling effectively prevent control powered support jammed accident during mining below unconsolidated confined aquifer. The influencing factors on stability structure analyzed, method aquifer was designed. evolution process stres...

All coal fields in North China are affected by floor confined water to varying degrees, failure and inrush risk have always been a major problem baffle mining activities. Roof cutting pressure relief the lack of protective pillar can cause change stress field, leading depth, field is key determine depth failure. In order deeply study distribution characteristics gob-side entry retaining with ro...

Textile industry has been playing an important role in the global economy development, international business and trade. In China, textile industry is a traditional pillar industry and an important livelihood industry. The proportion of textile industrial output on GDP has risen to approximately 7% in recent five years. Currently, the ever increasing amount of carbon dioxide emissions, which ha...

Under the condition of close-distance double-thick coal seams’ mining, serious strata behavior occurred in lower retracement channel, which is affected by double disturbance with upper coal-pillar static load and mining dynamic pressure. Field investigation, laboratory test, numerical simulation were used to study failure characteristics stress distribution N0381 channel. The results show that ...