基于强矿压显现的围岩巷道U29型矩形支架优化OA

In view of the frequent failure problem of the support system in the 307 panel area roadway surrounding rock of the 14#layer in Meiyukou Mine under strong mine pressure behavior,based on the surrounding rock dynamic response mechanism and the structural stiffness collaborative mechanism,a U29-shaped rectangular steel bracket optimized design system is constructed.The FLAC3D and ANSYS/LS-DYNA joint modeling method is adopted to simulate the stress response,deformation mode,and energy dissipation process of the bracket under impact load;By stiffening nodes,nested connections,and optimizing support processes,the overall stiffness and resisting shear strength of the bracket are improved.The industrial test results show that optimizing the bracket can significantly reduce the roof subsidence rate,the side convergence amount,and the bracket torsion rate.The retention rate of the bearing capacity is improved to 88.7%,effectively suppressing structural damage and surrounding rock instability caused by impact disturbance,and providing a reliable support technology path for controlling the strong mine pressure behavior of high stress roadways.