Research On Roof Caving Mechanism And Control Technology Of Thin-layer Compound Roof

Thin-layer compound roof in coal mine is frequently encountered and unfavorablegeological condition for roadway excavation, it has often led to the roof separation fallinginstability phenomena in the construction safety and long-termmaintenance easily, it is one ofthe major hidden threat to the safety of coal mine roof.This paper is in order to thin-layer compound roof roadway construction and support asthe background,use the method which is combining the laboratory rock mechanicsexperiment, numerical simulation and theoretical analysis,defined the concept of thethin-layer conpond roof and analysis the rocak properties of the roof strata,studied the weakenand law of the tin-layer compound roof rock by the water,obtained the stability of the road ofthin-layer compound roof by water seepage,proposed the security control measures for theroadway of thin-layer compound roof.In order to research on the characteristics and variation of deformation and failure,establish numerical analysis model by using the FLAC2Dsoftware,simulation the deformationand failure process of thin-layer compound roof surrounding rock, analysis and get thevariation of the rock stress field and failure characteristics from the process which thesurrounding rock has began from the tunnel excavation to thebolt support to reach a newstable under the water seepage.Engineering practice shows that:the support design based on the roof caving mechanism ofthin-layer compound roof is effective and feasible.