上行超长孔瓦斯压力测定方法的研究与应用

Research and Application of Method of Gas Pressure Measurement with Upturned-long Distance Holes

瓦斯压力反应煤层中瓦斯的赋存状态。根据瓦斯含量计算公式,压力的大小直接影响到煤层的瓦斯含量。瓦斯压力值是判断煤层突出危险性的重要指标,也是采取抽放措施的重要参考依据,因此,准确获取煤层的瓦斯压力尤为重要。而在目前普遍采用的瓦斯压力测定方法中,由于泄压半径以及封孔长度等因素的影响,使得所测得的压力值存在较大误差,不能准确反应煤层中的瓦斯赋存状况。上行超长孔瓦斯压力测定方法的研究,解决了由于法距过短而使得测点处于泄压范围内的问题;同时,采用高压水泥浆堵裂隙和水泥浆封孔能够更好地保证封孔的质量,使得所测瓦斯压力更接近原始值。

Gas pressure reflects the condition of methane in coal.According to the expression,the pressure decides how much gas which is contained.So,it is a significant index on judgment of coal and gas outburst,also it plays an important role in the course that measures would be took to decrease its value.But due to the short plumb-distance and some other reasons,an error,sometimes big,always exists on the pressure value,which is measured with the methods that are broadly adopted nowadays.However,if we get the pressure value under the long plumb-distance condition,and improve the stuff which is filled in the holes at the meantime,the value will get close to the true value.