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Coupled Modeling Of An Impact In Tunnel Face Burst


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P. Procházka


Coupled modeling of an impact in tunnel face burst P. Prochazka Czech Technical University & R.E.A.T. s.r.o, Prague, Czech Republic Abstract Rock bumps or rock bursts occur mostly at deep excavations, during mining, tunneling at high enough overburden, and shaft excavations. As an effect of instability of tunnel or shaft face, the extrusion of the rock mass into free space is studied both experimentally and mathematically. Frictional ignition and tensile overstressing of the mass may also cause the rock burst. This paper focuses on this phenomenon, starting with a specially prepared experiment and a new numerical procedure. Both these tools provide a new view at process of initiation of the failure of rock at tunnel face. The experimental study model simulates the situation on site, while numerical model informs about detailed material behavior at local zones endangered by the overstressing. Correctness of the numerical model is verified by distribution of s