Research On Time-effect Stability Of The End Sope Of Tianchi Energy South Open-pit Coal Mine Based On Energy Method

In the time-effect slope theory,the coupling relationship between the exposure time of the end slope and the slope stability is an important factor affecting the recovery rate.This paper studies the time-effect relationship between the end slope deformation and the slope failure process from the energy point of view.The main research content includes the study of rock mechanics characteristics and the slope shear failure energy characteristics and the slope time-dependent stability research,and the Xinjiang Tianchi Energy The South Open-pit Coal Mine is an engineering example for application research.The main research contents are as follows:(1)Through a large number of laboratory mechanical tests on 14 typical rock formations in the south side of Xinjiang Tianchi Energy South Open-pit Mine,including 14 sets of uniaxial compression tests and 42 sets of rock shear tests,the basic mechanical properties and mechanics of the rock are obtained.Parameters,based on the Mohr Coulomb criterion and multiple rock shear tests under normal stress conditions of 1 MPa,2 MPa,and 3 MPa,the cohesive force and internal friction angle of each rock are calculated.(2)This paper studies the transformation law between external force work,rock elastic deformation energy,and dissipated energy during rock failure during rock shear test,analyzes the stage characteristics of energy transformation,and obtains the rock energy transformation law The law affected by the normal stress compares the relationship between the energy conversion and the damage and fracture process in the shearing process of sandstone and mudstone.(3)In order to solve the shortcomings of traditional slope research methods on dynamic problems,this paper uses the principle of conservation of energy as a criterion to establish a slope based on the loss of gravitational potential energy caused by slope deformation as the energy source and the energy required for slope failure as the criterion Slope stability energy analysis method.This method can effectively analyze and calculate the time-dependent characteristics of slope from excavation to failure and stability from initial to limit state,and the calculation method is derived through the slope mathematical model.(4)Through the RMR rock mass quality evaluation,the rock mechanics and energy parameters are converted into the applicable rock mass values,and the stability of the slope limit equilibrium method is calculated using GEO numerical simulation software.Combined with the analysis of radar data,the current situation of the south side of Xinjiang Tianchi Energy South Open-pit Mine was calculated,judged and predicted by the energy method,and finally,combined with the engineering conditions,the slope optimization design plan of "reserved coal" was given.There are 41 figures,14 tables,and 53 references in this thesis.