Geoysynthetics August/September 2023 - 26

Searching to maximize stress reduction ratio with biaxial geogrids and timber piling
6 inches (15 cm) apart, with the bottom
layer 6 inches (15 cm) above the top of the
pile caps. The total load transfer platform
aggregate thickness was 3 feet (90 cm)
of Illinois Department of Transportation
(IDOT) gradation CA-6 stone.
Monitoring and
assessing the SRR
The timber support piles were to be
driven through organic deposits and
verified with the Washington State
Department of Transportation (WSDOT)
dynamic formula, in accordance with the
IDOT standard. Due to the uncertainty of
pile verification, both with the use of timber
piling as well as driving through peat
and organics, the capacity of the piles
was verified by dynamic Pile Driving
Analyzer (PDA) to assist in establishing
site-specific driving criteria and ensure
adequate axial capacity.
The overall effectiveness of the
geogrid system, and a basic assessment
of the applied SRR, was evaluated by
inclusion of nested, 100 psi (690 kPa)
maximum pressure piezometers, installed
below and between the pile caps, to measure
increases in pore pressure beneath
the load transfer system, and an inclinometer
installed within Burlington
Avenue to monitor potential bulging and
lateral load transfer within the organic
materials. The upper piezometer was
installed at a depth of 7 feet (2.1 meters)
below the base of the leveling pad with
upper organic soil unit 2 and the second
piezometer was installed at 17 feet (5.2
meters) below pad elevation within the
organic silty soil unit 3. The inclinometer
was positioned about 8 feet (2.4 meter)
from the face of the wall and extended
from the surface of Burlington Avenue to
a depth of 46 feet (14 meters), locked into
the underlying sand unit 4. Schematics of
the monitoring placements are illustrated
in Figure 3.
Construction of the wall began in late
FIGURE 3 Modular wall construction monitoring device geometry
26
Geosynthetics | August September 2023
May 2020 and took approximately one
week to complete. The piezometers and
inclinometer were installed two weeks
prior to wall placement to allow for grout
set-up and for initial, baseline pore pressure
values to be established. Placement
of the bottom row of modular block units
on May 30 (Figure 1) resulted in a maximum
pore pressure increase of only 0.2
psi (1.4 kPa), showing a significant shedding
of load over the piles via the geogrid.
The second row of blocks placed on June
1st (Figure 4) barely registered 0.1 psi
(0.7 kPa) during placement and by the
time the final row of blocks was placed
on June 3 (Figure 4) the ground had
actually achieved a state of pore pressure

Geoysynthetics August/September 2023

Table of Contents for the Digital Edition of Geoysynthetics August/September 2023

Geoysynthetics August/September 2023 - Cover1
Geoysynthetics August/September 2023 - Cover2
Geoysynthetics August/September 2023 - 1
Geoysynthetics August/September 2023 - 2
Geoysynthetics August/September 2023 - 3
Geoysynthetics August/September 2023 - 4
Geoysynthetics August/September 2023 - 5
Geoysynthetics August/September 2023 - 6
Geoysynthetics August/September 2023 - 7
Geoysynthetics August/September 2023 - 8
Geoysynthetics August/September 2023 - 9
Geoysynthetics August/September 2023 - 10
Geoysynthetics August/September 2023 - 11
Geoysynthetics August/September 2023 - 12
Geoysynthetics August/September 2023 - 13
Geoysynthetics August/September 2023 - 14
Geoysynthetics August/September 2023 - 15
Geoysynthetics August/September 2023 - 16
Geoysynthetics August/September 2023 - 17
Geoysynthetics August/September 2023 - 18
Geoysynthetics August/September 2023 - 19
Geoysynthetics August/September 2023 - 20
Geoysynthetics August/September 2023 - 21
Geoysynthetics August/September 2023 - 22
Geoysynthetics August/September 2023 - 23
Geoysynthetics August/September 2023 - 24
Geoysynthetics August/September 2023 - 25
Geoysynthetics August/September 2023 - 26
Geoysynthetics August/September 2023 - 27
Geoysynthetics August/September 2023 - 28
Geoysynthetics August/September 2023 - 29
Geoysynthetics August/September 2023 - 30
Geoysynthetics August/September 2023 - 31
Geoysynthetics August/September 2023 - 32
Geoysynthetics August/September 2023 - 33
Geoysynthetics August/September 2023 - 34
Geoysynthetics August/September 2023 - 35
Geoysynthetics August/September 2023 - 36
Geoysynthetics August/September 2023 - 37
Geoysynthetics August/September 2023 - 38
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Geoysynthetics August/September 2023 - 40
Geoysynthetics August/September 2023 - 41
Geoysynthetics August/September 2023 - 42
Geoysynthetics August/September 2023 - 43
Geoysynthetics August/September 2023 - 44
Geoysynthetics August/September 2023 - Cover3
Geoysynthetics August/September 2023 - Cover4
https://www.nxtbook.com/ata/geosynthetics/geosynthetics-december-2024-january-2025
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https://www.nxtbook.com/ata/geosynthetics/geosynthetics-april-may-2024
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https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-december-2021-january-2022
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