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156_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

156_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 -...

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DF37 DRILLED SHAFTS (also drilled piers, bored piles or drilled caisson) o high capacity, deep foundation constructed by drilling a hole into the soil and/or rock and then placing steel reinforcement and concrete to form a cast-in-place structural element o often "socket" shaft bottom in rock (most of capacity will come from socket) o shaft bottom may be "belled" to increase bearing area (usually done only in clay) o often replace several driven piles with one shaft (transmission towers), but may be used in groups to support very heavy pier loads, especially bridges and raft foundations
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Unformatted text preview: AXIAL LOAD, P u ~-SHAn DIAMETER CAN VARY WIDELY, B REINfORCING STEEL (FREQUENTLY REQUIRED BY DESIGN) I SIDE RESISTANCE, Q s PAD OR TOE BELL ANGLE--TYPICALLY 45° -6cf BELL OR UNDERREAM SIZE VARIES-NO LARGER 1 1 THAN THREE nMES SHAn· L __---=-I-=::=1c::;:=::;::::::2--L DIAMETER AT BASE ttttt-t-f-[ ~:JJlo~R SHAn BASE RESISTANCE, Q T (END BEARING) BASE DIAMETER, B b ~ design/construction goal is to utilize the full strength of the soil/rock...
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