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Author:
Sachin Kumar
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2005-05-18 |
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Dear Mr. Wong,
Can you please suggest how should I do the pore pressure variation? If I model it as ini pp 3000 var 0 -500, this is causing collapse of tunnel at 100% relaxation.
Thanks
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Follow-up:
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Author:
Keith Wong
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2005-05-18 |
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Hi Kumar
From the outset of your description, without actually knowing the geomechanical properties of your ground, apparently it can make sence that your tunnel "collapses" because of the 100% relaxation. Displacements can naturally be very high. You may need to do some sensitivity analysis to get a more realistic relaxation before you place the lining. Determine a suitable ground support reaction point provides a good picture in determining reasonable displacements, stress relaxation and therefore support loads.
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Return
to subject 'Geotechnical design and analysis'
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Follow-ups:
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Subject:
Tunnel Design (FLAC) 