DOI: 10.11799/ce202512016
Full-lifecycle evolution law of floor heave in gob-side entry retaining by roof cutting and pressure relief
YAN Jiyuan
HUA Xinzhu
LI Chen
Abstract：To optimize the stability of gob-side entry retaining by roof cutting and pressure relief in deep mines,based on the 360606 working face of Huainan Xinji No.1 Coal Mine,we focused on the full-lifecycle evolution law of floor heave in the entry and proposed control strategies.A comprehensive approach involving theoretical analysis,mechanical modeling,and FLAC3D numerical simulation was employed.Theoretical analysis revealed the mechanism of floor heave at each stage:during roadway excavation,due to stress redistribution,the floor heave was 118 mm;during primary mining,influenced by abutment pressure,it increased to 351.6 mm;during secondary mining,due to bending instability of the immediate floor,it reached 836.9 mm.Numerical simulations indicated that during secondary mining,the peak vertical stress reached 44 MPa,and the plastic zone extended to 40 m ahead of the working face,with high-stress concentration and plastic zone expansion exacerbating floor heave.Based on these findings,a"advanced-lagged-stabilized"phased collaborative control strategy was proposed,and roof cutting parameters were optimized to adjust the stress field.After on-site application,floor heave was reduced to 474 mm,representing a 43.3％decrease compared to the theoretical value,the roadway deformation was effectively controlled.
Keywords：gob-side entry retainingroof cutting and pressure reliefroadway floor heavefloor evolution characteristics
Publication Date：2025-12-20
Online Publishing Date：2026-01-29(First online date of this platform, not the publication date of the document)
Pages：9( 118-126 )