lec 03 3 earth pressure -...
TRANSCRIPT
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 1
LECTURE 03
Lateral earth pressure
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 2
Curved failure surface
Shear forces that develop at the wall-soil interface causes the failure surface to become curved
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 3
Log-spiral
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 4
Rankine zone
Radial shear zone
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 5
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 6
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 7
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 8
Additional concerns
Effect of water table
Effect of surcharge
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 9
Calculation of passive earth pressure
qKp
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 10
Failure modes
Overturning
Sliding
Slope failure
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 11
Braced cuts (excavation)
Provides temporary support during excavationA typical braced cut consists of sheet piles, wales, and strutsNeed to design the structural elements / spacing / intervalNeed to know the lateral earth pressure
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 12
Earth pressures
Difference between failure modes of retaining walls and braced excavation: Failure as a single unit (simultaneous) vs. Progressive failureEmpirical earth pressure (Peck, 1969)
CIE3032 지반공학및실험 lecture 03 lateral earth pressure 13
Braced cuts (excavation)
Calculation for the strut load: assume struts are connected by hinges except for top and bottom struts (fixed)
Example 14.2