DOI: 10.11799/ce202507006
Combined control technology of prestressed anchor-grout-shotcrete for gob-side entry of medium-thick coal seams and the application
SUN Fang
ZHU Lezhang
ZHAO Hongzhi
JIAO Jiankang
Abstract：Aiming at the problems of large deformation of surrounding rock and difficult maintenance of gob-side roadway with small coal pillar in medium-thick coal seam,taking 8226 return airway of Xutuan Coal Mine as the research object,the large deformation mechanism of surrounding rock of gob-side roadway under the existing support scheme was analyzed by combining theoretical analysis with field measurement.It was pointed out that the large deformation of roadway surrounding rock was caused by the strength-stress imbalance of coal body,the fracture of coal body structure,the double disturbance of mining dynamic pressure and the insufficient design of support system.Based on this,a combined control technology of pre-stressed anchor-grout-shotcrete was proposed,which combined strong primary support using high pre-stressed anchor-mesh-cable,shotcreting and grouting with pre-stressed anchor-cable and roadway side reinforcement during mining dynamic pressure influence,and the industrial tests were carried out.The application results showed that the displacement of the two sides of the gob-side roadway was 150～200 mm,and the roof subsidence was 50～100 mm,indicating favorable deformation control for the surrounding rock of the gob-side roadway.The technology can provide reference for surrounding rock control of gob-side roadways under similar conditions.
Keywords：medium-thick coal seamgob-side roadwaycombined control with prestressed anchor-grout-shotcretesurrounding rock control
Publication Date：2025-07-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 37-44 )