摘要
为解决深埋薄基岩切顶卸压沿空留巷巷道受采动影响支护困难的问题,以焦作煤业集团赵固(新乡)能源有限责任公司赵固一矿18060综放工作面切顶卸压沿空留巷巷道为工程背景,基于留巷围岩结构运动和覆岩力学传递特征,提出深埋薄基岩切顶卸压沿空留巷巷道围岩协同控制技术。研究结果表明:采用定向预裂爆破技术能够切断留巷顶板下位关键岩层,并形成短壁梁结构;与未切顶相比,切顶后巷道侧向支承压力减小14.17 MPa(降低37.67%),顶板竖向应力峰值减小5.22 MPa(降低22.5%);切顶侧矿压较未切顶侧明显降低,切顶影响范围约30 m;留巷两帮收缩量最大为471 mm,顶底板移近量最大为717 mm,工作面后方约200 m开始稳定。提出的深埋薄基岩切顶卸压沿空留巷围岩协同控制技术现场应用效果较好,可为类似地质条件下的切顶卸压沿空留提供参考。
In order to solve the problem of support difficulty of deep gob side entry retaining affected by mining, taking the gob side entry retaining of 18060 fully mechanized top coal caving face in Zhaogu No.1 mine as the engineering background, based on the movement of surrounding rock structure and mechanical transfer characteristics of overlying rock, the coordinated control system of surrounding rock of deep gob side entry retaining was proposed.The study results showed that the directional presplitting blasting technology could cut off the key strata under the roof of the retaining roadway and formed a short wall beam structure;Compared with no roof cutting, the lateral abutment pressure of roadway after roof cutting decreased by 14.17 MPa(37.67%),and the peak vertical stress of roof decreased by 5.22 MPa(22.5%);The rock pressure on the cutting side was significantly lower than that on the non cutting side, and the influence range of cutting was about 30 m;The maximum shrinkage of the two sides of the retained roadway was 471 mm, the maximum approach of the roof and floor was 727 mm, and it started to stabilize about 200 m behind the working face.The field application effect was good, which could provide technical reference for the application of roof-cutting and pressure-relief without coal pillar self forming roadway under similar engineering conditions.
作者
赵社会
张广杰
王文
ZHAO Shehui;ZHANG Guangjie;WANG Wen(Zhaogu(Xinxiang)Energy Co.,Ltd.,Jiaozuo Coal Industry Group,Xinxiang 453634,Henan,China;Henan Institute of Technology,Henan Polytechnic University,Jiaozuo 454000,Henan,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China)
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2022年第1期29-42,共14页
Journal of Henan Polytechnic University（Natural Science）
基金
国家自然科学基金资助项目(51604093)。
关键词
综放工作面
煤柱
切顶卸压
沿空留巷
预裂爆破
围岩协同控制
coal pillar
roof-cutting and pressure-relief
roadway without coal pillar
presplitting blasting
surrounding rock
coordinated control
