Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： In order to reduce the dynamic disaster caused by rockburst , by using the energy principle ofrockburst , the concept of non-uniform thin-wall stress concentration is put forward. The analysis shows thatthe location of rockburst is stress concentration and high stress gradient.On basis of the construction ofpractical engineering ,and FLAC3 numerical simulation software was developed by FISH programming;theenergy evolution rules of deep underground cavern with dynamic load and the failure forms and dynamiceresponse of yield space of steel frame are systematically studied from the local yield of surrounding rock. The researches show that due to the local yield effect of the surrounding rock , the disturbance to the sur-rounding rock is reduced , and the shockwaves energy is absorbed and reflected in the working face , resul-ting in weak dynamic response and reduced dynamic load.After the excavation of the cave ,the rock massis firstly tension and then shear failure , and the residual elastic strain energy is released.The location ofrock burst is directly connection to the orientation of the maximum principal stress of the rock mass.
Subjects: Mechanics >> Applied Mechanics submitted time 2023-03-20 Cooperative journals: 《应用力学学报》
Abstract： Accurale prediction assessment is an important premise for formulating rockburst preventionstrategies. FLACnumerical simulation software was secondarily developed by using FISH language pro-gramming,and based on dynamic numerical analysis , after a detailed analysis of the evolution process andformation mechanism of rockburst , six kinds of rockburst prediction assessment indexes are applied to No.4 diversion tunnel of Jinping ll Hydropower Slation. The results showed that the shear failure occuredmainly in the right side wall and arch haunch of the lunnel face , and the gentle acceleration process of rockfraclure evolution around the cavern is also the process of energy accumulation and dissipation in the sur-rounding rock.When predicting the location of rockburst , Turchaninov criterion is more consistent with thefield situation than Hoek and Russenes criterion , because it diectly verilfies its rationality as the locationcriterion of rockburst. 'The research achievements can provide some reference for similar projecls.
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