Full-space cooperative support technology and engineering application of elliptical ring double-anchor shell for deep soft-rock roadways
ZUO Jianping
ZHU Fan
WANG Jun
MA Zongyu
DING Hougang
XU Chengyi
LIU Fayi
Abstract：Aiming at the problem of large deformation and difficult support of deep soft rock in Hudi Coal Mine of Qinshui Coalfield,the stress characteristics of surrounding rock of roadway with dif-ferent cross-section shapes were analyzed in depth.Based on the theory of uniform-strength sup-port,the full-space cooperative support model of elliptical ring double-anchor shell concrete-filled steel tube support was proposed for the first time.The equivalent axial ratio adjustable technology was developed to dynamically match the in-situ stress environment.The anchor cables with differ-ent anchorage lengths were determined to construct the elliptical bearing structure,and the high-strength concrete-filled steel tube support was used as the"rigid support core"to form a full-space cooperative system with active and passive coordination.The calculation formula of supporting strength required by surrounding rock of roadway with different section and buried depth was ana-lyzed.The numerical simulation method was used to analyze the stress evolution and deformation of surrounding rock under different cross-section shapes,buried depths,axial ratio relationships,cooperative effects,and differences in support methods.The results show that with the increase of buried depth,the surrounding rock control ability of the full-space cooperative support in different sections is gradually enhanced and better than that of the initial support method.The maximum con-trol deformation efficiency can reach 75.4%,the peak stress decreases by about 11.9 MPa,and the stress difference decreases,which proves the feasibility of the equivalent axial ratio control.The stress of anchorage boundary tends to be stable,and the difference is 0.98～1.21 MPa.The feasibility of the full-space cooperative support is verified by monitoring the stress state of the whole section of the support through the field industrial test.
Keywords：elliptical ring double-anchor shell concrete-filled steel tube supportequivalent stress axis ratioelliptical bearing structurefull-space cooperative support
Publication Date：2026-03-31
Online Publishing Date：2026-04-08(First online date of this platform, not the publication date of the document)
Pages：18( 447-464 )