摘要
采用定向水力致裂技术控制坚硬顶板的效果随水力割缝预割缝槽长度的增加而增强,为进一步研究添加磨料后的水力割缝效果,采用高压磨料水力割缝试验系统,对煤岩体磨料水力割缝基本规律进行了试验研究,分析了泵注压力、割缝时间、磨料浓度和岩性变化对磨料水力割缝效果的影响规律。试验结果表明:割缝深度随泵注压力基本呈线性增加;随着割缝时间延长,割缝深度不断增大,但超过有效割缝时间T后,割缝深度不再变化;特定割缝参数条件下,磨料浓度越接近3.4%时,割缝深度越接近极限深度;同一材料不同影响因素下割缝宽度基本无变化;割缝效果(割缝深度、宽度)随岩石强度、结构致密性的增大而变弱。研究结果可为优化现场磨料水力割缝施工参数设计提供参考。
The effect of using directional hydraulic fracturing technology to control the hard roof increases with the length of a pre-cut slot by hydraulic cutting.To further study the hydraulic cutting effect after adding abrasive,the basic law of abrasive hydraulic cutting for coal-rock mass was studied using the experimental system of high pressure abrasive hydraulic cutting.The effects of pumping pressure,cutting time,abrasive concentration and lithology on the abrasive hydraulic cutting effect were analyzed.The experimental results show that the cutting depth increases linearly with the pumping pressure.With the extension of the cutting time,the cutting depth increases,but after the effective cutting time,T,the cutting depth keeps constant.With specific cutting parameters,the closer the abrasive concentration to 3.4%,the closer the cutting depth to the limit depth.With different influencing factors of the same material,the width of the cutting is unchanged.The cutting effect(cutting depth and width)decreases with the increase of rock strength and structure compactness.The study results provide bases for optimizing the design of field abrasive hydraulic cutting construction parameters.
作者
陈树亮
黄炳香
李丁
赵兴龙
徐杰
王常委
CHEN Shuliang;HUANG Bingxiang;LI Ding;ZHAO Xinglong;XU Jie;WANG Changwei(Safety Engineering School,China University of Mining and Technology,Xuzhou,221116,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China)
出处
《采矿与岩层控制工程学报》
北大核心
2020年第4期86-92,共7页
Journal of Mining and Strata Control Engineering
基金
国家自然科学基金面上资助项目(51774272)。
关键词
磨料水力割缝
泵注压力
割缝时间
磨料浓度
割缝效果
abrasive hydraulic cutting
pumping pressure
cutting time
abrasive concentration
cutting effect
