September/October 2023 - 109

Table 1. Summary of geotechnical laboratory test results - total strength
Moisture
Content
Sample (%)
HS1S2
φ CPT
Φ SPT
24.4
-
-
Total
Density
(pcf)
125.0
-
-
Dry
Density
(pcf)
100.5
-
-
USCS
Classification
SM-SP
-
-
Table 2. Summary of geotechnical laboratory test results - peak strength
Moisture
Content
Sample (%)
HS1S2
φ CPT
Φ SPT
24.4
-
-
Total
Density
(pcf)
124.7
-
-
Dry
Density
(pcf)
100.3
-
-
Compressive Tests - The FRP
foundations were installed to a depth of
~33 ft (10 m) below ground line using a
mobile ram that imparted both crowd
force and controlled oscillation. The
compression load tests were performed
according to the procedures of ASTM
D 1143-07, " Standard Test Methods for
Deep Foundation Elements Under
Static Axial Compressive Load - Quick
Method. " The test setup consisted of
various components including the
36 in (915 mm) diameter test pile, 12
reaction piles made of PZC-20 sheet
piles, a 350 kip (1,560 kN) jack, a
reaction beam, a reference frame to
hold the displacement dial gauges and
a load cell to measure the compression
load. The data was collected using a
readout box manufactured by Geokon
and the compression load values were
also recorded using a pressure meter
connected to the jack.
USCS
Classification
SM-SP
-
-
Specific Gravity
@ 20°Celcius
2.65
-
-
Unconfined
Compressive
Strength
(TSF)
0.395
-
-
Peak Strength from CD
Direct Shear Tests
(Internal Friction
Angle, Φ)
38.7
32.7
31.7
(Cohesion, c,
TSF)
0.1
-
-
Specific Gravity
@ 20°Celcius
2.65
-
-
Unconfined
Compressive
Strength
(TSF)
0.395
-
-
Total Strength Envelopes from
Unconsolidated Undrained (UU)
Tests
(Internal Friction
Angle, Φ)
32.1
32.7
31.7
(Cohesion, c,
TSF)
0.125
-
-
Comparison of axial compression load to vertical deflection
Uplift Tests - The uplift load
reaction frame was assembled on a
system consisting of reinforced concrete
rectangular blocks supporting an
I-beam frame attached to the test
foundation base plate. Four dial gauges
mounted on top of the foundation base
plate and located at 2, 4, 8 and 10 o'clock
measured vertical displacements. The
static axial tensile load test was conducted
according to ASTM D3689-13,
Quick Load (Sect. 8.1.2). The test pile was
loaded from 0-280 kip (0-1,245 kN) in
10 kip 45 (kN) increments, with each
increment applied for five minutes. After
reaching 280 kip (1,245 kN), the load was
gradually reduced to 270, 260, 245, 70
and finally 0 kip (1,200, 1,155, 1,090 and
310 kN). During the unloading stage, it
was observed that maintaining each
DEEP FOUNDATIONS * SEPT/OCT 2023 * 109

September/October 2023

Table of Contents for the Digital Edition of September/October 2023

TOC
September/October 2023 - Intro
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