pipe pile wall with jet grouting works -...
TRANSCRIPT
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Pipe Pile Wall with Jet Grouting Works
MTR 1107 – Shatin to Central Link - Diamond Hill to Kai Tak Tunnels
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WEBSTER - POSEY
EXTERIOR SEISMIC RETROFIT
Oakland – Alameda
California
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Drilling 2,400 lft - 68 Holes - 1,600 cy grouted
Jet grouting over water was performed to improve the soil behind a
submerged retaining wall
TreviIcos : WF George Dam AL-GA (USA) Jet grouting over water
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WEBSTER St. AND POSEY TUBES EXTERIOR SEISMIC RETROFIT
PHASE II
Owner: State of California - Department of Transportation
Contract #: 04-440144
General Contractor: American Civil Construction West Coast Inc.
Jet grouting Subcontractor: Wagner J.V. (TREVI ICOS Corporation)
Original contract amount : $ 30,780,055.00
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Webster St. And Posey tubes Project Location
Alameda
Island
Oakland
The Webster St. and Posey
Tubes are two parallel tunnels
that run beneath the Oakland
Estuary in San Francisco Bay to
connect Alameda Island with
Oakland.
The tubes became subject to
review as part of the California
Department of Transportation
(Caltrans) recent seismic retrofit
program.
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Webster St. And Posey tubes
Project history - Description of the problem
“The tubes consist of precast concrete immersed tube segments connected
to cast-in-place concrete cut-and-cover sections at the Oakland portals.
When the tunnels were constructed (Posey Tube in the 1920s and Webster
Street Tube in the 1960s), the immersed tube segments were placed over a
1.5-m (5-foot) layer of uncompacted clean sand in a trench excavated in the
estuary floor. The backfill around Webster Street Tube consists of washed,
poorly graded clean sand; the Posey Tube is embedded in soft clay
(probably dredge spoil) with sand to sandy silt zones. Figure 1 shows a
typical section of the Posey and Webster St. Tubes. “ (PB Network, Fall 1997 • Issue No. 40 • Volume XI • Number 4)
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Project history Isolation Wall Principle
“Posey Tube. In the clay backfill of the Posey Tube, stone columns
would be ineffective. We proposed an “isolation wall” of overlapping
jet grout columns (Figure 4)..”
(PB Network, Fall 1997 • Issue No. 40 • Volume XI • Number 4)
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Project Specifications Technical requirements
WEBSTER TUBE
Core recovery % 85%
Strength@28 MPa 6.89
Unit weight kg/m3
POSEY TUBE
Core recovery % 85%
Strength@28 MPa 4.13
Unit weight kg/m3
Tolerances
Ground heave: > 2.5 mm requires more frequent check
Placement of insertion of monitor:
Horizontal tolerance: ± 75 mm
Vertical tolerance: ~ 0.8%
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Jet Grouting Triple Fluid - Parameters
Range of grouting parameters utilized during treatment
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Jet Grouting Work Performed – quantities
DESCRIPTION TUBE SIDE Vertical JG length
[meters] Total [meters]
JET GROUTING ON LAND
WEBSTER ST TUBE
OAKLAND 1,000 3,700
ALAMEDA 2700
POSEY TUBE
OAKLAND 2,400
7,500 ALAMEDA 5,100
JET GROUTING OVER WATER POSEY TUBE 7,300 7,300
TREMIE PLATFORM POSEY TUBE ALAMEDA 350 350
18.850
Location Webster Posey Subtotal Total
Land Oak 112 195 307
950 Ala 210 433 643
Water 535 535 535
322 1163 1485 1485
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EQUIPMENT Jet grouting Rig: Soilmec SM 525
Over Water
On Land
Multipurpose drilling rig suitable for:
Micropiles
Anchoring
Jet Grouting
Coring
Drain hole/soak-aways
Water wells
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Over Water
EQUIPMENT Jet grouting Rig: Soilmec Euro 40
On Land Micropiles
Jet Grouting
Self-erecting 110 feet long mast
5 tm nominal torque
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EQUIPMENT Euro 40 Barge – Plan View
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EQUIPMENT Euro 40 Barge
Turbidity Curtain
Mast support
platform
Working windows
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EQUIPMENT
Euro 40 Barge- Section
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EQUIPMENT
Euro 40 Barge
POSITIONING SYSTEM
2 GPS
SECONDARY SPOIL
CONTAIMENT
10 in CASING
10 X 80 Feet
WORKING MOON POOL
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EQUIPMENT
Euro 40 Barge
800 cy scow
Spoil hose from
diverter to scow
Mast : 125 feet tall
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EQUIPMENT SM 525 Barge – Plan View
110 Lf [33.53 m]3
4 L
f [1
0.3
6 m
]
82.06 Lf [25.01 m] 25.5 Lf [7.77 m]
Air
compressor
Toilette
Win
ch
Win
ch
Ligth tower
Ligth tower1000 gal
Diesel tank
Water
tank
working rig platformworking labor platform
Moring LineMoring Line
Cantilever support structure
Edge of barge
Edge of barge
Cantilever support structure
working rig platform
Crane mats
Storage
area
Barge mov.
control panel.
Moring LineMoring Line
Win
ch
Win
ch
JG COLUMNS LINE
JG COLUMNS LINE
110 Lf [33.53 m]3
4 L
f [1
0.3
6 m
]
82.06 Lf [25.01 m] 25.5 Lf [7.77 m]
Air
compressor
Toilette
Win
ch
Win
ch
Ligth tower
Ligth tower1000 gal
Diesel tank
Water
tank
working rig platformworking labor platform
Moring LineMoring Line
Cantilever support structure
Edge of barge
Edge of barge
Cantilever support structure
working rig platform
Crane mats
Storage
area
Barge mov.
control panel.
Moring LineMoring Line
Win
ch
Win
ch
JG COLUMNS LINE
JG COLUMNS LINE
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EQUIPMENT SM 525 Barge
Positioning system
Euro 40 barge
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Quality Control
Real time Monitoring – Satellital Positioning
GPS 1
GPS 2
Clinometer
Hydropro software
Target location
Horizontal precision: 0.01 feet
Vertical precision: 0.04 feet
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Quality Control
Core 590-591
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CASE HISTORIES
SELA 22 PROJECT – NEW ORLEANS (USA)
NEW ORLEANS & surroundings are the perfect environment for the development of geotechnical solutions for:
Poor overall mechanical properties of the foundation soils
Abundance of organic layers
Extremely shallow groundwater table
Depth of competent layers
Simplified soil profile
Average
geotechnical
properties
Soil type General description
Fill Clay, organics and shell fragments
Lean Clay Soft to very soft lean clay and silt, saturated
Silt; silty and clayey sand Soft silts and silty fine sands, saturated
Sand Fine to poorly graded gray sands
Soil Type
Dry
density
[g/cm³]
Natural
density
[g/cm³]
Water
content
[%]
Organic
content
[%] LL PL PI
S1 - Sensitive Clay 1.158 1.679 29.8÷56.5 2.60 33.7 19.3 14.3
S2 - Transition Layer 1.216 1.775 28.4÷54.8 2.73 29.5 19.5 10.0
S3 - Sand 1.603 1.839 14.7÷43.3 0.63
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CASE HISTORIES
SELA 22 PROJECT – NEW ORLEANS (USA)
Scope of work was the construction of a buried concrete box culvert
14.0ft
8.0ft
10.0
ft
16.5ft
structural backfill
TR
S (
to r
em
ain
in
pla
ce)
TR
S (
to r
em
ain
in
pla
ce)
Jefferson Avenue Prytania Street
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CASE HISTORIES
SELA 22 PROJECT – NEW ORLEANS (USA)
Ground improvement to replace soil between sheet piles with a soil-cement mass in order to eliminate under-seepage and provide vertical and lateral support
14.0ft
8.0ft
10
.0ft
16.5ft
structural backfill
TR
S (
to r
em
ain
in
pla
ce)
TR
S (
to r
em
ain
in
pla
ce)
21
.5ft
- M
IN
JET GROUT BLOCK
Project Requirements
• 100% area replacement ratio
• 5% coring
• 1 QC test (UCS, HC) every 3 ft
• 100 PSI minimum UCS
• 1x10-6 cm/s maximum HC
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CASE HISTORIES
SELA 22 PROJECT – NEW ORLEANS (USA)
Some numbers…
•No. 2,401 JG column installed
•Approx. 16 month of production – from April ‘14 to July ‘15
•No. 2 JG units used (since January ‘15)
•Over 1,500 m of treatment
•Over 57,000 cum of treatment (gross)
•Over 46,000 cum of treatment (net)
•Over 21,500 ton of binder used
•Over 55,000 man-hours
Sta.
9+75
Sta.
46+71.25 Sta.
0+00
Sta.
13+32.12
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CASE HISTORIES
SELA 22 PROJECT – NEW ORLEANS (USA) Geometry
8.5 ft
9.5 ft
4.5 ft
JEFFERSON AVE - Typical Layout
10.0 ft
PRYTANIA ST - Typical Layout
16.5 ft
3.67 ft3.67 ft
18.0 ft
11.5 ft11.5 ft
3.67 ft3.67 ft
4.5 ft
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RECENT DEVELOPMENTS
JET GROUTING EXECUTED WITH A VARIABLE SPEED OF THE RODS
If we vary the rods’ rotation speed during the execution of the treatment, what do we obtain?
Vr1
Vr1
Vr2 Vr2
Monitor jet
Vr2 < Vr1
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RECENT DEVELOPMENTS
S S
F
F
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CASE HISTORIES
SELA 22 PROJECT – NEW ORLEANS (USA)
Real-time Monitoring of drilling and jetting
parameters
Quality Control
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CASE HISTORIES
SELA 22 PROJECT – NEW ORLEANS (USA)
Quality control
Coring and lab test (UCS and permeability test)
14,0
16,0
18,0
20,0
22,0
24,0
26,0
28,0
30,0
32,0
34,0
36,0
38,0
40,0
50 100 150 200 250 300 350 400 450
Dep
th B
GL
[ft
]
UCS [PSI]
UCS (normalized 28d)14
16
18
20
22
24
26
28
30
32
34
36
38
40
1,E-101,E-081,E-061,E-04
Dep
th B
GL
[ft
]
HC [cm/s]
HC (normalized 28d)
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CASE HISTORIES
SELA 22 PROJECT – NEW ORLEANS (USA)
Elliptical vs. Traditional JG
Increased Productivity
less installations
reduced overlap
reduced binder consumption
Total treated area: 198 ft² (100% coverage)
Overlap: 77.6 ft² (40%) Overlap: 25.8 ft² (13%)
Ø7.0 ft
Overlap
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CASE HISTORIES
SELA 22 PROJECT – NEW ORLEANS (USA)
Final Results
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SOIL MIXING - CASE HISTORIES
TREVI TURBO-MIX (single and double-axis)
The additional energy :
greatly improves the quality of the mixing of the soil with the grout slurry.
much larger quantity of soil can be treated than by conventional soil mixing methods
positive repercussions on production and costs.
Combines the injection of pre-set quantities of cement slurry at high velocity into the ground with the traditional mechanical mixing of the rotating blades.
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SOIL MIXING - CASE HISTORIES
LPV111 – New Orleans East
• Soil stabilization, settlement control, structural support (vertical & lateral)
• 1,300,000 cu.m of treated soil (21 m max depth)→ largest ever in
western hemisphere (up to 8 rig on site) • 460,000 ton of binder used → enough to build a sidewalk from NOLA
to Rome!
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SOIL MIXING - CASE HISTORIES
TECHNICAL SPECIFICATION FOR ACCEPTANCE CRITERIA
Core recovery: >80%
Unmixed material or inclusion <20%
Strength 100 psi @ 28 day
Allowable % UCS lower then design 10%
Coring Operations
0% failure in excess of 600 cores
LPV111 – New Orleans East
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SOIL MIXING - CASE HISTORIES
LPV111 – New Orleans East
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SOIL MIXING - CASE HISTORIES
SR83 over Choctawhatchee Bay– S. Rosa Beach, FL (ongoing)
• Ground stabilization, settlement control for causeway expansion • Deep & Shallow Mixing Method - Trevi Turbo Mix (double axis) • 255,000 cy of treated soil (45 ft max depth, 98% area coverage)
(random fill, sand, silt )
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SOIL MIXING - CASE HISTORIES
Rehabilitation of Historical Structures – San Marco bell tower Venice (Italy)
Foundation access chambers (reinforced DMM walls, DMM bottom plug, low-P injections, performed with a small drilling rig)
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JET – GROUTING – advantages
The main reasons for a big success ..........
improve the mechanical and permeability features od a wide range of di soils (from gravels to peaty clays);
obtain columns/panels of consolidated soil with diameter larger than 4 m and lenght deeper than 60 m (dams cut-off), starting from small-size drilling holes (i.e. ø 120÷200 mm);
go through possible underground obstacles and obstractions (i.e. old foundations, blocks of rock etc.)
perform treatment also within low-height and/or low-width spaces (i.e. inside cellars, courtyards, buildings etc.), by using small-size and low-weight drilling rigs.
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www.trevispa.com Foundation
specialist
www.soilmec.com
www.drillmec.it
www.trevipark.com
www.trevigroup.com