复杂水文地质条件下疏放水钻孔施工参数优化研究  

Optimization of construction parameters for drainage drilling under complex hydrogeological conditions

作　　者：王廷 WANG Ting(Yangquan Xinyu Geotechnical Engineering Co.,Ltd.,Yangquan 045000,China)

机构地区：[1]阳泉新宇岩土工程有限责任公司,山西阳泉045000

出　　处：《陕西煤炭》2024年第7期105-108,137,共5页Shaanxi Coal

摘　　要：针对复合充水含水层情况下煤层采前疏放水钻孔施工参数问题,采用数值模拟分析方式,对不同钻孔角度、钻孔数量和钻场间距等因素变化情况下,疏放水效率和经济性进行了研究。结果表明,钻孔总涌水量随钻孔仰角增大而逐渐减小,随钻孔数量增大而逐渐增大,当钻孔数量超过5个后,钻孔总涌水量基本不变;当钻孔仰角为60°时,单位长度钻孔涌水量最大,钻孔数量越多,单位长度钻孔涌水量越小;单个钻场的最佳施工参数为垂向长度120 m,钻孔仰角60°,钻孔数量为5个;减小钻场间距可以提高疏放水效率,但也会增加钻孔和排水的施工费用,因此,在工期比较宽裕的情况下,建议将钻场间距调大,当工期较为紧凑时,建议将钻场间距调小。In light of the problem of drilling construction parameters for pre mining drainage of coal seams in composite water filled aquifers,numerical simulation analysis was used to study the efficiency and economy of drainage under different drilling angles,number of drilling holes,and spacing between drilling sites.The results show that the total water inflow of the borehole gradually decreases with the increase of the borehole elevation angle,and gradually increases with the increase of the number of boreholes.When the number of boreholes exceeds 5,the total water inflow of the borehole remains basically unchanged;When the elevation angle of the borehole is 60°,the maximum water inflow per unit length of borehole is achieved,and the more boreholes there are,the smaller the water inflow per unit length of borehole is;The optimal construction parameters for a single drilling site are:a vertical length of 120 m,a drilling elevation angle of 60°,and 5 drilling holes;Reducing the spacing between drilling sites can improve the efficiency of drainage,but it will also increase the construction cost of drilling and drainage.Therefore,it is recommended to increase the spacing between drilling sites when the construction period is relatively ample,and to reduce the spacing between drilling sites when the construction period is relatively compact.

关 键 词：复合充水含水层 数值模拟 钻孔仰角 钻孔数量 钻场间距 涌水量 疏放水 

分 类 号：TD743[矿业工程—矿井通风与安全]