Research on energy-consuming support structure with limited resistance in large deformation roadway

During deep coal mining,there are some problems such as “high ground stress,large deformation and destruction of supporting structure”. In order to solve these problems,taking the eastern auxiliary track roadway in the east of Zhujidong Mine as the engineering background, the deformation monitoring and numerical simulation methods were used to study the deformation characteristics of the surrounding rock of the deep shaft soft rock roadway. Based on the concept of energy - consuming support of the surrounding rock,a “limiting support resistance dampener” (referred to as “limiting dampener”) was designed to control the energy release and deformation of the surrounding rock in the roadway. The relationship between the performance indexes and the design parameters of the limiting damper specimen was obtained through a combination of numerical analysis and indoor hydrostatic testing,and the performance of the limiting damper was verified. Finally,the deformation and stresses of the conventional and energy - consuming forms of support were compared by numerical simulation to verify the feasibility of the energy - consuming support scheme. The results show that the test compression of the limiting dampener is more than 80%,and it has a large deformation stroke. The purpose of reducing the surrounding rock pressure and dissipating the surrounding rock energy is achieved under the premise of ensuring the large deformation of the initial support. Compared with conventional roadway support,the maximum principal stress value of the energy-consuming support structure with limited resistance is reduced by 51. 2% and 89. 8% respectively,which improves the safety of the structure.