Key Points Analysis of Deformation Control Technology for Fractured Surrounding Rock Based on Improved GSI Quantification System
GSI is an important parameter for determining the strength of tunnel surrounding rock,and it plays an important role in the Hoek Brown strength criterion.The traditional GSI system has a certain degree of subjectivity in value selection,which restricts the practical application of engineering.The research process introduced an improved rock mass fragmentation index,Barton rock mass classification system,and joint condition coefficient,optimized the classification of rock surface conditions.Based on this,an improved GSI quantification system and classification method for fractured rock masses were established,and corresponding rock deformation control techniques were developed.The numerical simulation results show that the relevant technologies can effectively control the deformation of the surrounding rock,achieving the expected effect.
Improving the GSI quantification systemBroken surrounding rockDeformation controlNumerical simulation
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