摘要
针对鸟山井田深部综放开采软岩巷道支护难度大的难题,阐释了深部岩层非线性的应力应变特征,在综放面采用切顶卸压自成巷技术,同时采用理论分析、数值模拟和工程试验,研究了深部留巷的可行性,将留巷过程分为三个区并提出了针对性控制对策。将该技术在鸟山煤矿11031综放工作面回风巷道进行现场试验,现场监测结果表明:该巷道从掘进开始到回采结束,顶板下沉量表现出切缝侧大于巷中大于实体煤帮的规律,最大下沉量分别为155,128,81 mm,顶板离层量稳定时约119 mm,数值模拟结果表明切缝后顶板最大下沉量为175mm,有效控制了深部软岩巷道围岩变形,各项监测指标良好,验证了针对该综放面深部留巷设计的正确性。
Aiming at the supporting difficulty for deep soft rock roadway of full-mechanized caving mining in Niaoshan mine field,the stress and strain characteristics of deep rock layers with non restricted movement were explained.In the fully mechanized caving face,the roof cutting pressure relieving entry-forming technology was adopted.At the same time,theoretical analysis,numerical simulation,and engineering experiments were carried out to study the feasibility of deep roadway retaining.The roadway retaining process was divided into three zones and targeted control measures were proposed for design.The technology was tested on site in the air return way of the 11031 fully mechanized caving face in Niaoshan Coal Mine,which showed that,from the beginning of excavation to the end of mining,the roof subsidence of the roadway at the slitting site was greatest,followed by than the roadway center and the solid coal rib.The maximum subsidence was 155,128 and 81 mm,respectively.When the roof separation was stable,it was about 119 mm.According to the numerical simulation,the maximum subsidence of the roof was 175 mm after the slitting.The deformation of the surrounding rock in the deep soft rock roadway was effectively controlled,and various monitoring indicators were favorable,verifying the correctness of the design for the deep roadway in the fully mechanized caving face.
作者
于滨
高攀
YU Bin;CAO Pan(Hegang Niaoshan Coal Co.,Ltd.,Hegang 154106,China;State Key Laboratory of Geomechanics and Deep Underground Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)
出处
《煤炭工程》
北大核心
2024年第3期32-38,共7页
Coal Engineering
基金
国家自然科学基金资助项目(51904306)
中央高校基本科研业务费专项资金资助(2021XJLJ02)。
关键词
深部煤层
支护设计
切顶卸压自成巷
沿空留巷
deep coal seam
supporting design
entry-forming with roof cutting pressure relieving
gob-side entry retaining
