Study On Disturbance Failure Characteristics And Support Optimization Of Surrounding Rock In Deep Mining Of Subsea Gold Mine

Xishan Mining Area of Sanshandao Gold Mine has entered deep mining,with a mining depth of more than 1000m.With the increase of mining depth,the typical characteristics of deep mining in Sanshandao Gold Mine have emerged,with high ground stress,prominent rock burst problems,high stope temperature,increased mine water inflow,intensified ground pressure,and increased tunnel surrounding rock deformation,collapse,roof fall,and wall fragmentation.Especially in the development process below-600m level,significant rock burst has occurred.These disasters have seriously affected the safe production of Sanshandao Gold Mine underground and restricted the development of enterprises.Therefore,based on the complex environment and main problems in the deep Xishan mining area of Sanshandao Gold Mine,this paper systematically studies the disturbance and support optimization of the deep surrounding rock mining in Sanshandao Gold Mine by using the research methods such as laboratory test,numerical simulation,joint and fissure scanning,on-site monitoring,and theoretical analysis,in order to ensure the safe and efficient mining of the deep mineral resources in Xishan Mining Area.The main research results are as follows:（1）By conducting triaxial compression cyclic loading and unloading tests on rocks under high stress conditions,the evolution and distribution of energy during the loading and unloading process were analyzed.By analyzing the energy ratio curve of granite,it is found that the majority of the input energy of the testing machine is converted into internal elastic performance.In the actual engineering,the position where the original rock stress is greater,the proportion of elastic energy is greater.Excavation at this position will lead to a large release of elastic energy.（2）The influence of different dip angles of joints on stress wave propagation was studied using FLAC^3D simulation.When the surrounding rock of the roadway is disturbed by dynamic load,the area of the plastic zone at the roof and floor of the roadway increases with the increase of the distance from the loading surface of the stress wave,the increase of the stress wave amplitude and the decrease of the stress wave frequency.With the increase of the angle between the joint surface inclination and the roadway trend,the plastic zone area shows a small increase first and then decrease trend.（3）A structural plane digital recognition system was used to investigate and analyze the structural plane of the surrounding rock of a-780m level,obtaining detailed information on the structural plane.Based on the analysis results,the dynamic stability of the surrounding rock of the roadway with different occurrence joints under stress wave action was simulated and analyzed.Combined with monitoring data from multiple stress monitoring points in the deep mining area,it was found that as the impact of mining disturbance weakens,The stress values of each monitoring point gradually decrease and tend to stabilize,and the rock mass is relatively stable.（4）In view of the characteristics of the hydrochemical corrosion environment with high stress,high permeability,high temperature and strong disturbance in the deep part of Sanshandao Gold Mine,the corrosion degradation characteristics of the anchoring force of the traditional slotted bolt are studied,and the support scheme of the deformed steel resin bolt is proposed,and the time-varying characteristics of the section loss and yield failure of the bolt under different corrosion rates are analyzed.Field industrial tests have shown that using threaded steel resin anchor rods for anchor-jetting net support has advantages such as low cost,fast construction speed,good support effect,and diverse support forms.