Font Size: a A A

Research On The Detection Of Aquosity In Working Face Floor And Water-Inrush Prediction Technology

Posted on:2012-08-22Degree:MasterType:Thesis
Country:ChinaCandidate:X M LiFull Text:PDF
GTID:2211330368988356Subject:Safety Technology and Engineering
Abstract/Summary:PDF Full Text Request
With the increasing of mining depth, intensity and the constant expansion in modernized mine, coal seam face floor water-inrush is becoming more serious, which endangers people's lives and property, causes great loss and at the same time seriously influences and restricts the development of the coal industry. Carboniferous Permian system coal field in north China deposits directly on Ordovician limestone. The seam is near Ordovician limestone and generally characterized with high hydraulic pressure, thin valid resisting layer and aquifer system with strong water yield property. Therefore, coal mining in north China by floor confined water threat is more serious.Combined with 3701 face of Shandong Huaning mining group Baoan coal mines, research on aquosity detection of face floor and water-inrush prediction technology was carried out. According to the mechanism and prediction method of the water-inrush on the coal face floor, this paper gave the floor water-inrush coefficient expressions for field operation, and developed mine water-inrush forecast system applying Visual Basic language. Geophysical monitoring technology of mine water-inrush, high density dc resistivity method, mine transient electromagnetic method, the basic principle of underground work methods and data processing flow are also analyzed. Through the application of campus water project exploration, the detecting depth problem of high-density resistivity methods was discussed, and thus reasonable depth correction factor was given. By field experiments of underground fault, the influence of fracture structure to mine transient electromagnetic observation signal is determined. At the same time, it's believed that with the exclusion of noise interference, the level-reduction of the measured induction emf attenuation curve sleek degrees and the polarity changes of time door can be chosen as a decision basis of the development of the fracture structure.Through the analysis of structural geology and hydrogeology and based on the previous achievements, this paper did integrated geophysical exploration of the floor water-inrush using the tools of GeoPen high-density dc electricity device and PROTEM mine TEM device. The geophysical interpretation 3d display of working face floor water detection was realized. To detect the top interface of originally guided rising zone of different positions in 3701 face floor, then effective thickness of aquifuge in different locations were given and contour maps of effective thickness of aquifuge were obtained. Using floor water-inrush coefficient calculation formulas and water-inrush risk coefficient of strata in 3701 face floor different positions through effective thickness of aquifuge obtained by geophysical prospecting and with 3701 face floor water-inrush danger zone shown in graphs to stress the key of water control of working face floor. Finally, according to different water-inrush dangerous sections, puts forward relevant water-preventing strategies to enhance geological exploration, optimize mining coal mining process arrangement and main methods.
Keywords/Search Tags:floor water-inrush of working face, investigation depth, three-dimensional graphics, forecast of water inrush risk area
PDF Full Text Request
Related items