Lateral RW pressures for UDL & Point loads
Lateral RW pressures for UDL & Point loads
(OP)
Hi I am looking at some formulas which give lateral pressure distributions on retaining walls for point & UDL surcharge loads. The formulas do not reference Ka or K0 (AS4678 figure J7) or suggest how to modify these pressures for different Ka / K0 values. Does anyone know where I can find formulas for the above which incorporate Ka / K0? Thanks





RE: Lateral RW pressures for UDL & Point loads
RE: Lateral RW pressures for UDL & Point loads
For example, p = q x Ka
RE: Lateral RW pressures for UDL & Point loads
How do you edit posts here?
RE: Lateral RW pressures for UDL & Point loads
Prior to posting.
Mike McCann, PE, SE (WA)
RE: Lateral RW pressures for UDL & Point loads
RE: Lateral RW pressures for UDL & Point loads
One that gets overlook, surprisingly, is made by Terzaghi (thanks to FixedEarth to point this out to me) pg 367 of Soil Mechanics in Engineering Practice
Basically he establishes a 'C' factor and states that the load travels at a 40 deg angle relative to the horizontal and is applied where that line hits the wall.
'C' is the ratio of vertical to horizontal force
1. Course-grained without fines (clean sand and gravel) = 0.27
2. Course-grained w/fines = 0.3
3. Residual soil w/stones, fine silty sand or granular materials w/ conspicuous clay content = 0.39
4. Very soft or soft clay, organic silts, silty clay = 1.0
5. Medium or Stiff clay = 1.0
The last one seems odd, as in too conservative, but what do I know. I'm not Terzaghi.
EIT
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