Research On Optimization Of Roadway Support Scheme In Deep Shaft And Large Section Of Cixi Mine

Coal plays an important role in my country’s energy development.In recent years,with the increasing depth of coal mining,the use of large section roadways has become more frequent.With the increase of the burial depth and the expansion of the roadway section,the surrounding rock of the roadway has the destruction characteristics of large deformation and long duration of deformation.The traditional support form has been difficult to meet the safe use of the roadway.The optimization research of the scheme has become the top priority to solve such problems.In this paper,taking ingate,the auxiliary shaft of Cixi No.1 well as the engineering background,the theoretical analysis,numerical simulation and on-site monitoring are used to analyze and study the deformation failure and supporting technology of the surrounding rock of the deep section roadway in Cixi Mine.The following conclusions:(1)The deformation and failure characteristics of deep section roadway in Cixi Mine deep well and their influencing factors are summarized.The mechanism of deformation and failure in deep roadway of Cixi Coal Mine under high in-situ stress is analyzed.Based on the theory of surrounding rock loose circle,the head of the auxiliary well of Cixi No.1 well is calculated.The surrounding rock loosening circle of the door laneway belongs to the extremely unstable surrounding rock of the large loosening circle,and it needs to be supported on the whole section.(2)Using FLAC3D numerical simulation software to analyze the excavation of the tunnel under unsupported conditions,combined with the deformation and failure characteristics of the tunnel and the actual engineering situation,four different supporting schemes were designed and a numerical model was established to carry out displacement,stress and supporting structure stress Analysis and comparison,decided to use the third program as the initial support optimization program.(3)Comparing the monitoring data with the numerical simulation results,it is proved that the supporting scheme is practical and reasonable,which can effectively improve the stress distribution of the surrounding rock,greatly reduce the deformation of the roadway roof and floor and the two gangs,and improve the bearing capacity of the supporting structure.To ensure the stability of the roadway,it has certain guiding significance for the support work of the deep cross-section roadway.In this paper,we analyze and study the technology of deep-section tunnel support in Jiulong Mine,and propose a reasonable support scheme and apply it to the engineering practice,while verifying the feasibility of the support scheme in conjunction with real-time mine compaction monitoring,which provides reference for deep-section tunnel support,and has important guidance for similar engineering cases.