DOI: 10.11799/ce202411017
Stope stress evolution law of deep and thick roof working face and the regional hydraulic fracturing and pressure relief technology
PANG Lining
XUE Jisheng
ZHANG Zhen
Abstract：Aiming at solving the problems of high stope stress,large deformation amount and large roof fracture energy of the working face under the condition of recovery under deep and thick sandstone roof,the stress evolution law and stope displacement evolution law of No.130207 deep buried high-stress stope was simulated using the FLAC numerical simulation,and the results indicate that when the working face is advanced to the primary square and the second square,there will be high stress concentration with the concentration coefficient up to 2.5～4.0.The horizontal displacement of the air return roadway during the second square period can reach 390 mm.The floor heave volume can reach 413 mm.In order to ensure safe recovery of working face,a regional hydraulic fracturing and pressure relief scheme was formulated.Based on key stratum theory and composite beam theory,the key disaster-causing layer of No.130207 is at 22.83 m thick coarse-grained sandstone layer and 40.23 m thick coarse-grained sandstone layer.The crack initiation pressure is 13.06 MPa according to the calculation formula of Hubbert-Willsi non-permeable formation rupture pressure.After regional hydraulic fracturing,face periodical weighting interval and the continuous weighting distance are significantly reduced,the influence range and stress concentration coefficient of the advance abutment pressure are significantly reduced,and the daily maximum energy and daily average energy of the working face are significantly reduced,which indicates that the hydraulic fracturing technology in the directional area has a favorable effect.
Keywords：deep and thick roofstrong mine pressure behaviorstress evolution lawregional hydraulic fracturingkey hazard-causing layers
Publication Date：2024-11-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 110-117 )