摘要
针对超长大采高综采工作面厚硬夹矸层影响工作面安全高效回采的问题,采用理论分析、数值模拟和现场试验的方法,研究了煤层夹矸压裂软化机理,研究表明:高压水刀预裂、高压脉动压裂以及采动矿山压力三级耦合破岩,是实现夹矸岩层强度弱化的有效技术手段。通过物理力学试验及数值模拟确定了工作面夹矸压裂的压裂液类型及压裂设计参数。现场应用表明:工作面夹矸压裂之后,吨煤截齿消耗降低40%,油脂消耗降低27%,煤尘降低12%,采煤机运行速度提高35%,实现了工作面的安全清洁高效开采。
In view of the problem that the thick and hard gangue layer in the super long fully mechanized mining face with large mining height affected the safe and efficient mining of working face,the fracturing softening mechanism of gangue layer in coal seam was studied by theoretical analysis,numerical simulation and field test.The research showed that the three-stage coupling rock breaking of high-pressure water jet,high-pressure pulsating fracturing and mining pressure was an effective technology to realize the strength weakening of the gangue layer.Through physical and mechanical experiments and numerical simulation,types of fracturing fluid and parameters of fracturing design were determined.The field application showed that after the fracturing of gangue layer,cutting pick consumption per ton coal was reduced by 40%,oil consumption was reduced by 27%,coal dust was reduced by 12%,and running speed of shearer was increased by 35%,which realized safe,clean and efficient mining of the working face.
作者
张慧峰
Zhang Huifeng(Shaanxi Xiaobaodang Mining Industry Co.,Ltd.,Yulin,Shaanxi 719302,China)
出处
《中国煤炭》
2020年第12期129-133,共5页
China Coal
关键词
厚硬夹矸
水力压裂
强度弱化
压裂液
thick and hard gangue
hydraulic fracturing
strength weakening
fracturing fluid
