采矿与安全工程学报Issue(1)：163-167,5.DOI:10.13545/j.cnki.jmse.2015.01.026
含水煤岩体瓦斯压力测定的水锥效应研究
Water coning effect in gas pressure determination of coal-rock mass containing moisture
摘要
Abstract
The water coning of coal seam permeability coefficient and adsorption characteristic has seldom been studied at home and abroad. Aiming at that, the theory model of dynamical water coning breaking through boundary of drilling hole was established. The analysis presents that when evacuation during the process of gas pressure determination, gas flow amount is maximum, breaking through ve-locity of water coining is fastest, and the influence of gas flow decreasing after borehole sealing is smaller. Additionally, the relation between the time of breaking through boundary of drilling hole and the gas flow amount, thickness of coal seam, drilling depth and the porosity of coal mass in the rising process of dynamic water coning has been derived, and the times of water coning breaking through the boundaries with different flow rate, coal seam thickness and length of borehole were calculated. It is found that the breaking through time greatly reduces with the increase of flow rate. As the flow rate keep a constant, with the increase of the drilling depth, the breaking through time first undergoes a smaller variation process, and then decreases significantly. Moreover, using the ball direction flow field to determine the gas pressure in engineering , the influence of coal seam water coning to the gas pres-sure determination can be avoided by shorten the evacuation time.关键词
瓦斯压力/水锥效应/煤岩体Key words
gas pressure/water coning effect/coal-rock mass分类
矿业与冶金引用本文复制引用
李晓伟,蒋承林..含水煤岩体瓦斯压力测定的水锥效应研究[J].采矿与安全工程学报,2015,(1):163-167,5.基金项目
中国矿业大学青年科技基金项目(2009A004) （2009A004）
