A monitoring trial was carried out to investigate the effect of boreholes configuration on the stability and gas production rate. These boreholes were drilled from the retaining roadway at longwall mining panel 1111(1) of the Zhuji Coalmine, in China. A borehole camera exploration device and multiple gas parameter measuring device were adopted to monitor the stability and gas production rate. R...

This study uses the spaceborne radar interferometry technique to monitor ground subsidence and far-field displacement due to underground longwall mining in the Southern Coalfields of New South Wales, Australia. The radar images acquired by the European ENVISAT/ASAR and the Japanese ALOS/PALSAR sensors were used to compute the terrain deformation. ASAR and PALSAR sensors use microwave signals in...

Strata control of ultrasoft coal seam has been a critical problem for mining and geotechnical engineers in years. In this paper, the No. 66207 longwall panel at Xinzhuangzi mine, Anhui, China, was used as an example study. A systematic approach using laboratory testing, numerical simulation, field validation implemented to investigate influences roadway layout presplit blasting on mechanical pr...

China suffers the worst coal mine disasters in world. Lots of miners lose their lives or suffer occupational injury. Fortunately, is developing vigorously intelligent mining, which combination traditional mining and latest technology. Mining expects to relieve solve safety, health intensive labor issues ensure energy security by applying mining. This paper fully reviews promotion safety. Firstl...

Abstract Providing accurate prediction methods for mining-induced water fractured zones over the longwall goaf has become increasingly significant because of grand economic and technological challenges deeper extraction. Taking No. 839 coalface in Qingdong mining area as a case study, comprehensive study water-flowing zone (WFFZ) formation process peak height were carried out by radial basis fu...

Studies regarding the reuse of a gob-side roadway formed by N00 longwall mining method are scarce. To investigate mine pressure behavior characteristics during reuse, anchor cable force, roof-to-floor deformation, and working resistance hydraulic support obtained from verification face were analyzed. Test results show that influence range mining-induced was 0-90 m in front face. The ratios firs...