废矿是对安全采矿的威胁。他们另外的复杂地质的身体的成像效果或那些在常规反映的波浪图象经常是差的。因此,废矿的精确察觉成为了一个重要问题,到与紧急的一种感觉被解决。基
Variable frequency, a new pattern of pulse hydraulic fracturing, is presented for improving permeability in coal seam. A variable frequency pulse hydraulic frac
The stability of a backfill wall is critical to implement gob-side entry driving technology in which a small coal pillar is substituted by a waste backfill wall
A study to estimate land surface movement caused by large surface excavations in sedimentary strata is presented.In stratified or jointed strata the stress reli
Hydraulic slotting can induce drill spray in a gassy,low permeability coal seam.This then influences subsequent gas extraction.This paper describes the drill sp
The microflotation of three single minerals,mixed coal–kaolinite and mixed coal–montmorillonite were examined to study the effects of clay and calcium ions on
In order to utilize low-grade manganese ore resources effectively, a hydrometallurgical process was developed for manganese extraction in dilute sulfuric acid m
The main purpose of the present study was to provide a practical,convenient drillability prediction model based on rock mass characteristics,geological sampling
习近平总书记指出:“我们要从巩固全党全国各族人民团结奋斗的共同思想基础、巩固党的执政地位的战略高度,持续加强社会主义核心价值体系建设,把培育和弘扬社会主义核心价值观作
In Huojitu Coal Mine of Shendong mining area, the dynamic strata pressure (DSP) accidents occurred when the working faces passed the gully terrain. Focusing on