Earth Pressure for Deep Tunnel Shaft Design
Earth Pressure for Deep Tunnel Shaft Design
(OP)
Hi All,
I was wondering if anyone has latest references/sources for earth presure for deep tunnel shaft design (more than 100 feet deep). Are people still using the Terzaghi/Peck method to come up with the pressure diagram (0.65*Ka*Gamma to certain depth and then go stright line down)?
TIA,
HB4775
I was wondering if anyone has latest references/sources for earth presure for deep tunnel shaft design (more than 100 feet deep). Are people still using the Terzaghi/Peck method to come up with the pressure diagram (0.65*Ka*Gamma to certain depth and then go stright line down)?
TIA,
HB4775





RE: Earth Pressure for Deep Tunnel Shaft Design
RE: Earth Pressure for Deep Tunnel Shaft Design
RE: Earth Pressure for Deep Tunnel Shaft Design
RE: Earth Pressure for Deep Tunnel Shaft Design
RE: Earth Pressure for Deep Tunnel Shaft Design
http://www.guideme.com/Bookstores/TUNNELS.HTM
This reading list should help you get started. Look for projects similar to yours, then search for any other papers written by those authors. If you still can't find what you need, make a personal phone call. You would be surprised how helpful people will be -
Let us know what you decide to do, and why.
RE: Earth Pressure for Deep Tunnel Shaft Design
You are looking at the coefficient of lateral earth pressure loading the shaft . So, if you are in sands then this load will be around 30-35% of the effective overburden pressure, ka=0.33 say, (plus water). If you are in clays then k0 =1 or higher if the clay is overconsolidated.
Now, in clays you have to consider how quickly the load will "come on" to the shaft. This is a matter of experience and knowledge of the material you are tunnelling through. For temporary worksin some clays, up to 50% of the applied load can be removed as the ground load does not "come on" within the design life of the temporary works. Engineering judgement is required here.
RE: Earth Pressure for Deep Tunnel Shaft Design
D. Bruce Nothdurft, MSCE, PE, PG, M.ASCE, etc, etc,...
Principal Engineer/Geologist
Atlantic Geoscience & Engineering
Charlotte, NC