How to calculate sheet pile deflection and ground settlement?
How to calculate sheet pile deflection and ground settlement?
(OP)
Recently i'm doing a calculation involved the cantilever sheet pile for temporary earth retaining structure. Actually my excavation depth is 2 meter and the embedment depth is 2.1 meter. I get the max. bending moment =42 kNm/m. Now my question is how to get the:-
1) Lateral deflection.
2) Adjacent ground settlement.
Thanks.
1) Lateral deflection.
2) Adjacent ground settlement.
Thanks.





RE: How to calculate sheet pile deflection and ground settlement?
RE: How to calculate sheet pile deflection and ground settlement?
RE: How to calculate sheet pile deflection and ground settlement?
American Society of Civil Engineers (1990), Design and Performance of Earth Retaining Structures, Lambe & Hansen, ASCE Geotechnical Special Publication 25, "Construction Induced Movements of Insitu Walls."
RE: How to calculate sheet pile deflection and ground settlement?
http://www.vulcanhammer.net
http://www.vulcanhammer.info
RE: How to calculate sheet pile deflection and ground settlement?
RE: How to calculate sheet pile deflection and ground settlement?
RE: How to calculate sheet pile deflection and ground settlement?
The basic principle is simple. Actually too simple as the actual response is much more complicated, but it gives a good approximation.
A failure plane will develop in the retained soil that will start at the sheet where it meets the limit of excavation (the dredge line or mud line) This extends upward to the surface at angle equal to phi (the friction angle of the soil) from the horizontal. This is the failure plane. Compute the volume of the triangle formed by the vertical (undeflected) sheeting line, the top of ground and the failure plane.
Next computed the deflected shape of the sheet. Now draw a straight vertical line from the point of zero deflection and a horizontal line between the top of the deflected sheet and the vertical line. The vertical line represents the undeflected sheet and the horizontal line is the top of ground for the deflected sheet. Compute the area between these three lines.
Okay the first area represents the the volume of soil retained between the wall and the failure plane prior to movement. As the wall deflects, the wedge of soil will move down the failure plane, filling the deflected shape. Thus if we recompute the area bounded by the failure plane and the vertical (undeflected) sheet, we will find it has been reduced by the area required to compute the deflected shape. Knowing the value of the reduced area between the vertical line and the failure plane we can compute the reduced height of the triangle. The difference between the orginal height and the reduced height is your settlement.
Any Questions? Great! Clear as Mud? Thought so. Let me know if you followed this.