球向流场在被动法瓦斯压力测定中的时间及准确性优势研究  

Balance time and accuracy advantage of spherical flow field in gas pressure measurement by passive method

作　　者：李晓伟[1] 蒋承林[1] 陈裕佳[1] 唐俊[1] 

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2013年第3期421-425,共5页Journal of Mining & Safety Engineering

基　　金：中国矿业大学青年科技基金项目(2009A004)

摘　　要：针对被动法煤层瓦斯压力测定过程中平衡时间和准确度问题进行分析研究,研究发现被动法瓦斯压力测定过程中只要存在气体交换面,即可测得瓦斯压力,同时通过建立模型进行计算发现钻孔成孔过程中,球向钻孔卸压半径远小于径向钻孔,故瓦斯损失较小,按照极限平衡理论,理论平衡时间较短,测定的压力值要略高即准确度较高。经数值模拟计算证明了上述计算的正确性,并且发现自由排放时间越长,球向钻孔占径向钻孔平衡时间的百分比越小,平衡时间优势越明显。经现场实践证明被动法瓦斯压力测定过程中球向钻孔在平衡时间和准确性上优势明显。In this paper, the balance time and accuracy of passive method in gas pressure measurement was studied, the research shows that as long as there exits gas exchange face in the measurement proc- ess of passive method, the gas pressure can be measured. Meanwhile, through the calculation of estab- lished model, it is found that the pressure-relief diameter of spherical drilling hole is much smaller than that of the radial drilling hole in the formation process of drilling hole, thus, the gas loss is less. Ac- cording to the limit equilibrium theory, the theoretical balance time is short, and the measured pressure value is slightly higher, that is, the accuracy is high. The calculation validity was verified by numerical simulation. The simulation results also show that as the free emission time increases, the spherical drill- ing hole takes a smaller percentage of the balance time of radial drilling hole, and the advantage of the balance time is more obvious. The field practice proves that the spherical drilling hole has obvious ad- vantage in the balance time and accuracy during the gas pressure measurement process by passive method.

关 键 词：瓦斯压力 球向钻孔 径向钻孔 平衡时间 

分 类 号：TD712[矿业工程—矿井通风与安全]