基于井下定向钻孔的矿井地质异常体探查方法与应用

地质异常体是矿井灾害发生的主要隐蔽致灾因素,井下钻探工程是进行地质异常体探查、验证和治理的重要技术手段.针对常规钻孔探查距离短、精度低,且易存在探查盲区的不足,介绍了采用井下定向钻孔进行地质异常体探查的方案.总结地质异常体空间形态、岩性和钻探等识别特征,给出探查定向钻孔轨迹布设原则,得到基于定向钻孔的地质异常点和地质异...

Exploration method of underground geological anomaly and its application based on directional drilling

The geological anomaly is the main hidden cause of mine disasters, and underground drilling engineering is an important technical means for exploration, verification and control of geological anomaly. In view of the shortcomings such as short distance, low accuracy and blind area of conventional drilling exploration, the exploration scheme of geological anomaly by underground directional drilling was introduced, and the identification characteristics such as spatial form, lithology and drilling were summarized. The trajectory layout principle of directional borehole was given, and the spatial calculation and positioning method of geological anomaly based on directional borehole was obtained. In addition, the influencing factors and solutions for the exploration precision of directional borehole were analyzed from four aspects: borehole layout spacing, borehole trajectory measurement and control accuracy, stratum and geological anomaly recognition accuracy, and geological anomaly development scale. The tests were carried out in Zhaogu No.2 Coal Mine and Meihuajing Coal Mine, coal seam stability of roadway strip is explored by main hole and branch hole with the exploration distance over 621 m. Water filling source in working face is explored by directional drilling group, with maximum water yield of single hole of 10.2 m3/h, then the water is discharged. The tests results show that the underground directional drilling has realized the accurate positioning of geological anomaly with the advantages of high exploration accuracy, long distance and short cycle, which provides technical support for disaster and accident prevention.