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Results
Dynamic Stress Analysis and Application for Gas Drainage Through Strata by Presplitting Blasting
Gong, M. (University of Science and Technology Beijing) | Wen, B. (University of Science and Technology Beijing) | Wang, H. (University of Science and Technology Beijing) | Zhang, F. W. (Chongqing Energy Investment Group)
ABSTRACT: Deep-hole pre-splitting blasting technology is recently applied to gas drainage through strata for increasing drainage rate in coal mine. At the background of the underground engineering practice, this study is to combine the 3-D numerical simulation with field test of drainage. Relations between dynamic stress distribution of each borehole and drainage effect after explosion are discussed. Layouts of control holes and blasting holes are analyzed according to the characteristics of gas drainage through strata. Mathematical models of deep-hole presplitting blasting through strata are established. As a blasting hole is oriented crossing a seam with an angle, dynamic stress distribution of different coal seam sections are extremely uneven; charge length of blast holes is an important factor affecting their radial extent of damage, while destruction radius increases 33% when the charge length increased 73%. The dynamic stress of the center control hole is the biggest to other control holes. The average of gas drainage volume in blasting holes is 55% larger than that of control holes. 1 INTRODUCTION As a principal measure of gas control, gas drainage is widely adapted in coal and gas outburst mines. Through strata pre-splitting blasting (it is also abbreviated for through strata blasting) is a new technology for increase drainage rate of gas. The blasting holes are drilled from other roadway and pass through multiple medium such as coal and rock, so it is more complex and difficult to analyze the blasting mechanism in the multiple medium than whole blasting holes in coal seams. At present, most papers about through strata blasting introduce the application of blasting technology in control gas such as gas drainage along coal seam (Qiu & Gong 2009, Wang et al. 2008, Liu 1997), joint gas drainage and excavation (Guo et al. 2009, Cao & Yao 2009), rock cross-cut coal uncovering (Chen et al. 2009), treatment of blank area of drainage or other special site (Sun et al. 2010) and so on.
Deformation Monitoring and Security-Stability Analysis for Tailings Pond Starter Dam With Sectional Construction
Wang, H. (China Academy of Safety Science and Technology, Beijing) | Ma, H. T. (China Academy of Safety Science and Technology, Beijing) | Wu, Y. X. (University of Science and Technology Beijing)
ABSTRACT: The starter dam of a tailings pond, adopted sectional construction, might cause differential settlement, which will bring bad impact on the dam stability during use later. First, the deformation rate of starter dam was monitored by INSAR technology for 14 hours, which demonstrated that the nonuniform deformation rate was within the permissible security range. Secondly, by means of numerical calculation, simulating the real conditions of sequence of sectional construction, studying the distribution and the change relationship of the starter dam deformation along with the construction steps, it was concluded that the numerical calculation results mostly coincided with the monitoring results on both the whole settlement and uneven settlement distribution of the starter dam. At last, considering the real situation of tailings pond in the later use, the stability of the starter dam was analyzed under the fluid-structure interaction. The results show that the starter dam could remain stable during construction and later use. 1 OVERVIEW Tailing pond, damming the valley mouth or compound, is used for storage of ore tailings or industrial waste, which is produced by metal and nonmetal mines after beneficiation. Tailing pond is a major hazard with high potential of man-made debris flow, once the dam breaks, it will cause great disaster follows by great losses. Operational tailing ponds are not only related to the mine's own safety and economic benefits, but also closely related to the lives and property of the downstream residents and their surrounding environment (Ma et al. 2010, Xie et al. 2009). The security and stability of starter Dam with Section Construction plays a vital role for the safe operation of tailing pond. Therefore, the starter tailing dam stability monitoring and analysis are of great significance.
- Materials > Metals & Mining (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization (1.00)
- Data Science & Engineering Analytics > Information Management and Systems (1.00)
- Reservoir Description and Dynamics > Reservoir Fluid Dynamics > Flow in porous media (0.69)
- Reservoir Description and Dynamics > Reservoir Fluid Dynamics > Integration of geomechanics in models (0.67)