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

doi: doi: 10.16186/j.cnki.1673-9787.2024030061

Received：2024-03-21

Revised：2024-05-15

Online：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

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