Rock and machine interaction law during TBM crossing fault and prevention and control technology of jamming disaster in Shoushan No.1 Mine

ZHANG Jianguo; MU Tongtong; LU Yiqiang; LIU Jiawei; YANG Zhanbiao; ZHANG Sheng; WANG Longfei

doi:10.13347/j.cnki.mkaq.20241557

Abstract：When the fault fracture zones in coal mine roadways is excavated by tunnel boring machine(TBM),the machine is prone to jamming,which seriously restricts the excavation speed and adaptability of the TBM.In order to solve this problem,based on the rock-machine interaction data of the fault fracture zone excavated by TBM in Shoushan No.1 coal mine roadway,screening of large amounts of data for effective excavation-cycles,identification and division of each stage of the normal excavation-cycle,combined with the surrounding rock classification method of TBM rock-machine data fusion,the main excavation parameters changes and roadway damage phenomena of TBM before and during excavation in the fault are analyzed.The mechanism of machine jamming and disaster in fault fracture zone is revealed,and the disaster prevention and control measures of TBM in the coal mine roadway construction crossing the fault fracture zone are proposed.The results indicate that when the TBM is close to the fault interface,the construction speed sharply decreases,and it continues to excavate in the fault fracture zone with lower advancing speed and higher protection front shield pressure.When the cutterhead are fully in the fault plane,the pressure of the protection front shield rises to the maximum value,and the large-scale collapse of surrounding rock above the roadway arch,a large amount of broken rock mass rushes into the shield body,forming a silo-type collapse cavity above the cutterhead and shield.These problems not only affect the efficiency of TBM excavation,but also pose a serious threat to its structural stability,which eventually leads to the occurrence of jamming disaster.Therefore,when TBM passes through the fault fracture zone in the coal-bearing strata,it is necessary to make ad-vance geological information prediction of the rock mass.At the same time,advanced surrounding rock reinforcement equipment is configured in front of the TBM cutterhead,such as precise grouting equipment,advanced small pipe installation equipment,etc.Through the reinforcement of the broken rock mass,the surrounding rock parameters are indirectly improved to ensure that TBM passes through the fault fracture zone stably.