张盛，徐瑞泽，刘佳伟，等.极软厚煤层切顶卸压沿空留巷主动超前支护技术研究［J］.河南理工大学学报（自然科学版），doi:10.16186/j.cnki.1673-9787.2024030061

ZHANG S，XU R Z，LIU J W，et al.Research on active advanced support technology for gob-side entry retaining with roof cutting and pressure relief in ultra-soft coal seam［J］.Journal of Henan Polytechnic University（Natural Science），doi:10.16186/j.cnki.1673-9787.2024030061

极软厚煤层切顶卸压沿空留巷主动超前支护技术研究(网络首发)

张盛¹，徐瑞泽¹，刘佳伟¹，朱让河²，马强²，王高尚³，张帆³，赵龙刚⁴

（1.河南理工大学 能源科学与工程学院，河南 焦作 454000；2.河南省许昌新龙矿业有限责任公司，河南 禹州 461670；3.河南省新密市恒业有限公司和成煤矿，河南 新密 452370；4.河南永锦能源有限公司，河南 禹州 461670）

摘要: [目的] 切顶卸压沿空留巷技术在我国煤矿开采中应用广泛，但在极软厚煤层回采巷道切顶卸压沿空留巷时，存在帮部煤体松软、巷道高度大，传统被动式超前支护容易破坏顶板且影响作业空间等问题，需要对留巷的超前支护技术进行研究。 [方法] 以梁北矿32021机巷为工程背景，建立预裂切顶前后的巷道超前段围岩稳定性力学模型，分析切顶卸压前后留巷超前段顶板受力特征及变形规律，揭示受预裂切顶影响的超前段巷道围岩变形机理；采用FALC3D数值软件模拟分析定向爆破切顶条件下回采巷道的应力分布特征；提出主动式锚索梁协同锚固方案，设计超前主动支护参数，并进行现场应用。[结果] 结果表明，预裂切顶能够有效切断顶板之间的应力传递，使留巷超前段顶板围岩处于应力降低区，切顶后工作面与留巷交界处悬顶面积减小；经数值模拟验证，所给出的锚网索梁锚固方案在主动支护后能够有效控制巷道超前阶段围岩变形，并有利于保持留巷的长期稳定；主动超前支护现场应用后，巷道顶底板移近量最大不超过80 mm，顶板变形量减小了35%，且能够最大程度保持巷道顶板的完整性。[结论] 提出的主动式超前支护技术能够解决空间狭小、劳动强度大和顶板被反复支撑破坏等问题，对于类似矿井条件下沿空留巷的超前支护方式有重要的参考价值。

关键词:极软厚煤层；超前支承压力；主动超前支护技术；切顶卸压沿空留巷

中图分类号：TD353

doi: 10.16186/j.cnki.1673-9787. 2024030061

基金项目:国家自然科学基金资助项目（52374086，52174074）

收稿日期：2024-03-21

修回日期：2024-08-15

网络首发日期：2024-10-14

Research on active advanced support technology for gob-side entry retaining with roof cutting and pressure relief in ultra-soft coal seam

ZHANG Sheng¹，XU Ruize¹，LIU Jiawei¹，ZHU Ranghe²，MA Qiang²，WANG Gaoshang³，

ZHANG Fan³，ZHAO Longgang⁴

（1. College of Energy Science and Engineering， Henan Polytechnic University， Jiaozuo 454000， Henan， China；2. Henan Xuchang Xinlong Mining Co.， Ltd.， Yuzhou 461670， Henan， China；3. Henan Xinmi Hengye Co.， Ltd.， Hecheng Coal Mine， Xinmi 452370， Henan， China；4. Henan Yongjin Energy Co.， Ltd.， Yuzhou 461670， Henan， China）

Abstract: [Objective] Roof cutting and pressure relief gob-side entry retaining technology was widely used in coal mining in China. However， when roof cutting and pressure relief gob-side entry retaining was carried out in extremely soft and thick coal seam mining roadway， there were problems such as soft coal body in the side and large roadway height. Traditional passive advanced support was easy to destroy the roof and affect the working space. It was necessary to study the advanced support technology of retained roadway. [Methods] Based on the engineering background of 32021 roadway in Liangbei Coal Mine，the mechanical model of surrounding rock stability in advance section of roadway before and after pre-splitting roof cutting was established. The stress characteristics and deformation law of roof in advance section of roadway before and after roof cutting and pressure relief were analyzed， and the deformation mechanism of surrounding rock in advance section of roadway affected by pre-splitting roof cutting was revealed. The stress distribution characteristics of mining roadway under the condition of directional blasting roof cutting were simulated and analyzed by FALC3D numerical software. The active anchor cable beam collaborative anchoring scheme was proposed， the advanced active support parameters were designed， and the field application was carried out. [Results] The results showed that the pre-splitting roof cutting could effectively cut off the stress transfer between the roofs， so that the surrounding rock of the roof in the advance section of the retaining roadway was in the stress reduction area， and the hanging area at the junction of the working face and the retaining roadway was reduced after the roof cutting. It was verified by numerical simulation that the anchorage scheme of anchor net cable beam could effectively control the deformation of surrounding rock in the advance stage of roadway after active support， and was conducive to maintaining the long-term stability of roadway. After the field application of active advance support， the maximum displacement of roadway roof and floor was not more than 80 mm， the roof deformation was reduced by 35 %， and the integrity of roadway roof could be maintained to the greatest extent. [Conclusion] The proposed active advance support technology could solve the problems of narrow space， high labor intensity and repeated support damage of the roof. It has important reference value for the advance support method of gob-side entry retaining under similar mine conditions.

Key words: ultra-soft coal seam；advanced support pressure；active advance support technology；roof cutting gob-side entry retaining

CLC: