HOMEWORK NO.3
Due: Monday November 10
query No.1
A conception contractor is bidding for a figure-build tender package. The available
information on the subsoil conditions at the site is shown in Figure 1. You atomic number 18 engaged
as the Professional Engineer to submit a design of the piling placement. The contractor has
decided on cardinal options: 18in extracurricular diameter closed-ended pipe piles, HP 14 x 73 steel
H-pile sections and 18-in diameter drilled shafts. Proprietary pile sizes are summarized
on pages 10-6 to 10-24 of the 1.364 Course Notes. The pile cut-off level is 6 ft below
setting and the pile toe is at a depth of 50 ft. Additional data are given in flurry 1 for
your reference.
Table 1 discoloration compressibility parameters
Soil Type G/svo n Cc/(1+ eo) Cs/(1+ eo) cv (ft2/day)
Sand 300 0.2 - - -
Normally consolidated corpse 100 0.2 0.19 0.012 0.0465
Overconsolidated clay 400 0.3 0.05 0.005 2.0
Note that the preconsolidation pressure (sP) start quite widely. The best estimate of sP
is indicated by a square symbol in Figure 1.
TASKS
1.1 For each of the three piling systems:-
a. Assess the shaft friction and end stroller resistance to be used
b. figure the ultimate bearing might of a single pile.
c.
Determine the allowable on the job(p) consignment if a factor of caoutchouc of 2.5 is required on
the ultimate capacity
d. Estimate the settlement of a single pile at the selected working load use the load
transfer approach of Randolph and Wroth (1978) and the bouncy solutions of
Poulos and Davis (1980) discussed in the 1.364 course notes
e. Recommend the most suitable system for this site
1.2 For the drilled shaft option:-
a. Assess the efficiency of a 5-pile group with a pile spacing of 3 clock the pile
diameter
b. Determine the ultimate capacity and overall factor of safety of the group if the
working load is unchanged from that in Question 1.1c
2
c. Determine the elastic settlement of the pile group using the load...If you want to get a full essay, order it on our website: Orderessay
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