大采高综采工作面初采水力预裂复合顶板技术工程实践  

Technical practice of hydraulic presplitting composite roof in fully-mechanized mining face with large mining height

作　　者：王飞 刘江伟 于骞 WANG Fei;LIU Jiang-wei;YU Qian(Shanxi Coking Coal Xishan Coal Electricity Xiegou Coal Mine,Lüliang 033602,China;Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山焦西山煤电斜沟煤矿,山西吕梁033602 [2]山东科技大学,山东青岛266590

出　　处：《煤炭科技》2022年第5期112-116,共5页Coal Science & Technology Magazine

基　　金：国家自然科学基金面上项目(52174138)。

摘　　要：为解决大采高综采工作面初采期间复合顶板难垮落、来压步距大、冲击强度高的难题,以斜沟煤矿18505综采工作面为工程背景,根据工作面覆岩结构和地应力状况,确定了水力预裂设计方案,并进行了现场实践和效果监测。结果表明,与未采用该技术的工作面相比,顶板初次来压步距缩短,工作面支架的工作阻力明显降低,验证了水力预裂技术在大采高综采工作面的作用。研究为类似条件下实施水力预裂技术借鉴。To solve composite roof cave hard,large pressure interval,high strength when the large height mining in the fully-mechanized coal face at the beginning,in the engineering background of oblique groove 18505 fully-mechanized coal face,according to the working stress and ground stress condition during the preliminary extraction,determined the hydraulic design of pre-splitting,field practice and practice effect monitoring on the spot,the results showed that:When the fracturing time was 20 min and the pressure was 40~50 MPa,a large number of hydraulic cracks occur in the composite roof of the working face,the integrity of the rock strata in the hard roof was destroyed,the mechanical properties of the rock strata are changed,and the strength of the rock mass was significantly reduced.The width of the cracks was about 1~3 mm.With the mining of the working face,the roof could collapse in time,and the coal wall had no obvious slicing phenomenon.Compared with the working face without hydraulic fracturing,the pressure step distance was reduced by 10 m after hydraulic pre-cracking.Compared with the working face without hydraulic fracturing,the working resistance of the hydraulic support was smaller,and the impact strength of the first pressure of the roof on the working face support was weakened,which ensures the safe and efficient production of the working face.

关 键 词：复合顶板 水力预裂 来压步距 钻孔窥视 

分 类 号：TD235.3[矿业工程—矿井建设]