Study On The Energy Criterion And Disaster Process Of Strain Rockburst In Deep Underground Engineering

In recent years,as China’s " the Belt and Road Initiatives " "Nine across,nine across" accelerating and western major projects(such as "sichuan-tibet railway","railroads","south-north water diversion project",etc.,)implementation in succession,transportation and water conservancy and hydropower engineering construction in our country to the terrain of extremely complicated geological conditions of the western mountains and tectonic stress transfer active area.As construction depth increasing,the resulting encountered in the process of underground engineering construction of all kinds of geological disasters such as rockburst,water inrush,such as high thermal pollution problem has become a need to solve the problem,which has become water conservancy and hydropower,transportation tunnel rockburst,the metal non-metal mines and underground disposal of nuclear waste and other kinds of one of major geological disasters in underground engineering.Given the multiple of rockburst in underground engineering and major hazard-formative ,this article integrated the test research,theoretical analysis and numerical simulation method of combining the,of deep rock mechanics properties of the surrounding rock of underground engineering and the energy when the damage evolution rule,the energy criterion of rock burst more in-depth study on the mechanism,inoculation,obtained results in the paper are as follows:(1)Uniaxial compression test,triaxial compression test,Brazil splitting test and pressure unloading confining pressure test are carried out on granite,Using RMT-150 B rock mechanics test system.The strength and peak strain of granite increase with the increase of loading strain rate and initial confining pressure,while the rate of unloading confining pressure decreases with the increase of loading strain rate.The tensile strength of granite increases with the increase of loading rate.Compared with the Mohr-Coulomb strength criterion,the Mogi-Coulomb strength criterion has stronger adaptability in describing the failure law of confining pressure strength of rock unloading.(2)Based on the principle of energy,the whole evolution process of energy accumulation and release in the failure process of rockburst rock mass under uniaxial compression,triaxial compression and confining pressure stress unloading is discussed.The results show that the energy release of rock under tensile failure is significantly greater than that under shear failure.Under the same stress condition,the energy and energy release rate of rock failure under the path of unloading confining pressure are the largest.The larger the rate of unloading confining pressure,the more energy the rock absorbs from the outside world,and the greater the rockburst tendency is.(3)The three-dimensional discrete element numerical calculation software is redeveloped by using FISH language,and the energy field in the process of granite failure under multi-path is simulated and analyzed.It is concluded that the energy concentration area of the rock sample energy field is similar to the failure mode under the real path of rock.The failure process of granite under single surface unloading is simulated,and the simulation results show that single surface unloading can better reflect the phenomenon of rockburst ejection..(4)Put forward the Energy Criterion of rock burst REC(Rockburst Energy Criterion),will put forward the Energy Criterion of secondary development by Fish language import calculation model,simulated under different buried depth and coefficient of lateral pressure formed in the process of stress and displacement of surrounding rock,rock burst fractures and elastic strain Energy field,such as multivariate information transient evolution and position,degree and scope of the dynamic development process of rock burst.There are 76 figures,16 tables and 100 references...