DOI: 10.11799/ce202502010
Deformation control technology of layered floor of inclined coal seam
GAO Jun
Abstract：In view of the fact that the original support scheme of auxiliary transportation roadway in 071602 working face failed in floor heave controlling of the roadway,the joint support scheme of"floor grouting+grouting bolt(cable)"was put forward on the basis of the original support scheme.Firstly,the deformation and failure mechanism of roadway floor heave was analyzed,and the composite beam model of anchored layered floor was established.It was found that the roadway floor heave has a negative correlation with the surrounding rock stiffness of the floor,and a positive correlation with horizontal side pressure and vertical uniform load.The change of elastic modulus before and after the optimization of the support scheme was calculated,and the support stress of the optimized support scheme was 0.44 MPa higher than that of the original support scheme.The range of stable area with small deformation was increased by about 1 times.In practice,the displacement of roof and floor and the deformation of the two sides of the optimized support scheme were reduced by 1099 mm and 503 mm,respectively,compared with the original support scheme.The optimal support scheme can better control the floor heave deformation.
Keywords：anchorage bodysurrounding rock controlcomposite beam modelstiffnesshorizontal side pressurevertical uniform loadelastic modulus
Publication Date：2025-02-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 68-74 )