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 thick coal seams [J]. Journal of Henan Polytechnic University (Natural Science) , 2025, 44(4): 83-93.

doi: 10.16186/j.cnki.1673-9787.2024030061

Received: 2024/03/21

Revised: 2024/08/15

Published: 2025/06/19

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

Zhang Sheng1, Xu Ruize1, Liu Jiawei1, Zhu Ranghe2, Ma Qiang2, Wang Gaoshang3, Zhang Fan3, Zhao Longgang4

1.School 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: Objectives Roof cutting and pressure relief gob-side entry retaining technology is widely used in coal mining in China. However， in the case of extremely soft and thick coal seam roadways， challenges such as soft coal on the sidewalls and large roadway heights arise. Traditional passive advanced support techniques often lead to roof damage and limited working space. Therefore， it is essential to develop advanced support technologies for retained roadways. Methods Taking the 32021 roadway in Liangbei Coal Mine as the engineering background， a mechanical model was established to analyze the stability of the surrounding rock in the advance section of the roadway before and after pre-splitting roof cutting. The stress characteristics and deformation patterns of the roof in the advance section were studied， revealing the deformation mechanism of the surrounding rock influenced by pre-splitting roof cutting. Numerical simulations using FALC3D software were conducted to analyze the stress distribution of the roadway under directional blasting roof cutting conditions. An active anchor cable beam collaborative anchoring scheme was proposed， support parameters for active advanced support were designed， and the field applications were performed. Results The results indicated that the pre-splitting roof cutting effectively interrupted stress transfer between roof layers， placing the surrounding rock of the advance section in a stress reduction zone and reducing the hanging roof area at the junction of the working face and the retained roadway. Numerical simulations validated that the proposed anchor net cable beam could effectively control the deformation of the surrounding rock in the advance section after active support， contributing to the long-term stability of the roadway. Field applications demonstrated that the maximum displacement of the roof and floor did not exceed 80 mm， roof deformation was reduced by 35%， and the integrity of the roadway roof was significantly preserved. Conclusions The proposed active advanced support technology addresses challenges such as narrow working spaces， high labor intensity， and repetitive roof support damage. It offers valuable insights for implementing advanced support methods for gob-side entry retaining under similar mining conditions. 

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