Breakthroughs in Tunneling · PDF fileCompensation Grouting -or- Soilfrac® Grouting ......
43
www.HaywardBaker.com Compensation Grouting Breakthroughs in Tunneling August 14-16, 2017 Chicago Dennis W. Boehm
-
Upload
nguyenkien -
Category
Documents
-
view
258 -
download
9
Transcript of Breakthroughs in Tunneling · PDF fileCompensation Grouting -or- Soilfrac® Grouting ......
www.HaywardBaker.com
Compensation Grouting Breakthroughs in Tunneling
August 14-16, 2017
Chicago Dennis W. Boehm
2
Presentation Outline
• What is Compensation Grouting
• Installation Methods/Monitoring
• Case Histories
• Summary and conclusions
2
3
Presentation Outline
• What is Compensation Grouting
• Installation Methods/Monitoring
• Case Histories
• Summary and conclusions
3
4
Grouting Processes
5
Compensation Grouting -or- Soilfrac® Grouting
• Originally developed in the oil industry for fracturing formations to aide in the production of the well.
• Keller/Hayward Baker developed the process to accommodate small scale installation process for the geotechnical construction industry
• Allows precise control of lifting structures and when coupled with computer monitoring, control within millimeters
6
Soilfrac® Process
7
The injection pipes are made of multiple ported
tubes that allow design placement of grout
Grout after fracture initiated
Sleeve Port Pipe
Grouted Sheeth
Injection Port
Injection Pipe
Grout
Packer
Known as Tube-A-Manchette Pipes
8
Exposed Soilfrac lenses following a single
grout injection
9
Uses for Soilfrac® Grouting
10
Typical Grout Mix
• High to medium mobility cement based grout
• Typically 2-3:1 by weight of solids
• Common fillers are pre-hydrated bentonite, flyash, rock rock powders (i.e. limestone)
• Stabilizers and Fluidifiers
• Accelerants (i.e. granular or liquid sodium silicates)
10
11
Grouting Efficiency
• Ratio of ground volume change to grout volume injected
• Varies from site to site due to ground conditions
12
Presentation Outline
• What is Compensation Grouting
• Installation Methods/Monitoring
• Case Histories
• Summary and conclusions
12
13
Several methods of installing the grout pipes are
available based upon site restrictions
13
14
Soilfrac® - City-Tunnel Leipzig Control of drilling deviation
15
Compensation grouting from a shaft
15
16
Compensation grouting from nearby basement
16
17
Control of grouting parameters possible in real
time
17
All grouting parameters under real time control
Use of computer controlled pumping
units allow grout quantities to be
individually controlled controlled
pumping unit
18
Typical instrumentation types and locations
considered for compensation grouting
18
19
ww
w.Ke
llerG
rund
bau.
com
Compensation grouting “San Ruffillo”
TYPICAL CROSS SECTION Original design with SHAFT
fill sand
gravel, sandy, silty
grouting pipes 2 layers
tunnel 9.1m diameter
railway bridge
shaft
20
Pipe Installation by Horizontal Directional
Drilling (HDD)
20
21
Compensation grouting “San Ruffillo”
www.KellerGrundbau.com
TYPICAL CROSS SECTION
railway bridge
grouting pipes 2 layers maximum length 68m HDD-drilling
tunnel 9.1m diameter
fill sand
gravel, sandy, silty
22
Sophisticated and non sophisticated methods
allow for movement monitoring
22
Systems allow monitoring within 0.005 in
23
Soilfrac® - City-Tunnel Leipzig
Monitoring
24
Soilfrac® - City-Tunnel Leipzig
Grout control
Grout volume
Vertical displacement
TAM
25
Compensation grouting “Via Rimesse”
www.KellerGrundbau.com
3D graph of total grout volume
26
Presentation Outline
• What is Compensation Grouting
• Installation Methods/Monitoring
• Case Histories
• Summary and conclusions
26
27
San Francisco 3rd Street Light Rail - Central
Subway Drilling and Grouting Programs
Chinatown Station (CTS) Issue: Adjacent
Building Settlement along Station Excavation
Solution: Compensation Grouting
Union Market Square Station (UMS) Issue: Adjacent
Building Settlement along Station Excavation
Solution: Compensation Grouting
8/30/2017 27
28
CTS Compensation Grouting
28
Total Installed Grout Holes = 94
TAM Installed = 13,320 LFT
Treatment = 10 Buildings – 41,150 Sq. Ft.
29
CTS Compensation Grouting
Drilling and TAM Installation
30
CTS Compensation Grouting
Pre-conditioning Grouting
31
Union Square Market Station Array (UMS)
Compensation Grouting
Total Grout Holes = 209
TAM Installed = 19,605 LFT
Treatment = 15 Buildings – 126,815 Sq. Ft.
32
UMS Drilling and TAM Installation
33
UMS Pre-conditioning Grouting
34
LACMTA Regional Connector
As-Built TAM Locations
35
LACMTA Regional Connector
• Cross section - 13 precisely directionally navigated TAM’s up to 450 feet beneath the overlying structures on shallow spread footings
36
LACMTA Regional Connector
TAM Installation (cont.)
37
LACMTA Regional Connector
TAM Installation
38
LACMTA Regional Connector
HBI I-Grout Pumps and DAQ
39
LACMTA Regional Connector
Liquid Level and Tilt Meter Monitoring
40
Visualization software for monitoring the
grouting
40
41
LACMTA Goldline Monitoring
Portable tilt meters used on interior floor slabs. Near real time robotic total stations used on exteriors
42
SUMMARY and CONCLUSIONS
• Compensation grouting allows for quicker tunnelling applications
• Precise levelling of sensitive structures is more efficient with compensation grouting
• HDD installation procedures extend the treatment possible on project sites
• Visualization of the grouting process can be used to minimize “over grouting”
