Stability control technology for deep soft and broken composite roof in coal roadway
MENG Qingbin
KONG Linghui
HAN Lijun
LI Yun
NIE Junwei
LI Hao
GAO Jie
Abstract：In terms of the roof fall,large deformation and difficult support of deep soft broken composite roof in rectangular section coal roadway,based on the support theory of bolting and rope,this study put forward the beam-arch bearing structure which had the feature of composite beams and composite arch.The geometrical charac-teristics of the anchorage of beam-arch structure was analyzed,it revealed the formation process and evolution law of the beam-arch anchorage structure with different anchorage parameters and reflected the anchorage structure effects for different supporting programs.Four kinds of supporting technology solutions were studied by FLAC3D to simulate the surrounding rock displacement of deep soft broken composite roof and the damage extension evolution of plastic zone.It reveals the control effect of different supporting technology solutions in rectangular cross section coal roadway.The rationality of supporting technology scheme based on beam-arch structure in deep soft broken composite roof was validated,and the underground industrial test was carried out.Monitoring results show that the supporting technology of beam-arch structure effectively controls the deep soft broken composite roof abscission layer and large deformation.It can maintain the deep soft broken compound roof coal roadway surrounding rock and supporting structure stability and safety.
Keywords：deepweak and broken coal roadwaycompound roofbeam-arch anchor structureFLAC3D numerical simulation
Publication Date：2017-01-01