Stability problems in rock engineering 220.019, 2015W, SE · PDF fileStability problems in...
Transcript of Stability problems in rock engineering 220.019, 2015W, SE · PDF fileStability problems in...
Stability problems in rock engineering
220.019, 2015W, SE
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Tunnel 1 Alexander PREH & Alfred ZETTLER www.ig.tuwien.ac.at, [email protected]
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Stability problems in rock engineering
220.019, 2015W, SE
Tunnel 1 Alexander PREH & Alfred ZETTLER www.ig.tuwien.ac.at, [email protected]
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Stability problems in rock engineering
220.019, 2015W, SE
Tunnel 1 Alexander PREH & Alfred ZETTLER www.ig.tuwien.ac.at, [email protected]
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Stability problems in rock engineering
220.019, 2015W, SE
Tunnel 1 Alexander PREH & Alfred ZETTLER www.ig.tuwien.ac.at, [email protected]
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Stability problems in rock engineering
220.019, 2015W, SE
Tunnel 1 Alexander PREH & Alfred ZETTLER www.ig.tuwien.ac.at, [email protected]
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Stability problems in rock engineering
220.019, 2015W, SE
Tunnel 1 Alexander PREH & Alfred ZETTLER www.ig.tuwien.ac.at, [email protected]
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Stability problems in rock engineering
220.019, 2015W, SE
Tunnel 1 Alexander PREH & Alfred ZETTLER www.ig.tuwien.ac.at, [email protected]
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Stability problems in rock engineering
220.019, 2015W, SE
Tunnel 1 Alexander PREH & Alfred ZETTLER www.ig.tuwien.ac.at, [email protected]
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Stability problems in rock engineering
220.019, 2015W, SE
Problem statement: A circular tunnel (D=4m) is constructed in rock at the point with 185,20 m overburden and it is assumed that a circular support (e.g. shotcrete) is installed immediately after boring the tunnel. Also, it is presumed that tunnel is under a hydrostatic in-situ stresses. Parameters of rock and support are as below: Rock:
Φi=25◦
ci=0,03MPa
Er=1000 MPa
νr=0,25
K=1,03 (Labasse, 1949)
Φr=20◦
cr=0,03 Mpa
γ=27 kN/m3
Support:
Er=4000 MPa
νr=0,18
Questions: 1) Determine the thickness of the support required to limit the radial convergence (ur) to 35mm.
What is the support pressure on the lining? What is the tangential compressive stress in the lining? (it is assumed that the shotcrete properties are for a ‘young shotcrete’)
2) If before installing the shotcrete, 25mm of radial deformation is observed, determine the total
deformation and the support pressure when equilibrium is reached.
It’s recommended to use Excel, Matlab or Python to solve the problem!
Tunnel 1 Alexander PREH & Alfred ZETTLER www.ig.tuwien.ac.at, [email protected]
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