Cone penetration test based design and quality control of ... · Soil improvement design 5800...
Transcript of Cone penetration test based design and quality control of ... · Soil improvement design 5800...
Cone penetration test based design and quality control of soil improvement works
Zayed City, Emirati Neighbourhood Package 4, Abu Dhabi
23-Aug-18 Presentation 1
Contents
01 Menard
02 Soil Improvement Concepts
03 Cone Penetration Test & SBT
04 Soil Improvement Design
05 Case Study Abu Dhabi
Menard• Founded in 1960s• Subsidiary of Soletanche Freyssinet Group, specialist division of
Vinci Group (40.2 Billion EUR Turn Over in 2017).• Design & build ground improvement specialist contractor• Market leader in the world of soil treatment
23-Aug-18 Presentation
3
Permanent offices
Project basis
Soil Improvement – Why?
23-Aug-18 Presentation
4
Bearing Capacity
Absolute Settlement Differential Settlement
Liquefaction Remediation
Soil Improvement – Why?
23-Aug-18 Presentation
5
Why ground Improvement
?
Global solutions to
multiple problems
Time Savings~30-50%
Costs Savings~20-30%
Soil ImprovementApproachWhat? Requirements Soil performance
o Structureo Behaviouro Depth of improvement
23-Aug-18 Presentation
6
How? Compaction Reinforcement Consolidation
Soil ImprovementRequirementsParameter requirements Density Degree of compaction
23-Aug-18 Presentation
7
Functional requirements Settlement
o 20.0 mm (w/o long term)o For 3.0 m x 3.0 m footing
under 150 kPa load
Bearing Capacity
Factor of safety against liquefactiono Magnitude M = 6.0
earthquake with PGA = 0.15g at rock level.
Soil PerformanceCone Penetration Test (CPT) Geotechnical engineering properties and stratigraphy of the soil Accurate, repeatable & cheap Well established theory
23-Aug-18 Presentation
8
Soil PerformanceCPT: Structure and Behaviour
23-Aug-18 Presentation
9
Soil PerformanceCPT: Requirements / Performance
23-Aug-18 Presentation
10
Treatment TechniquesChoosing the most efficient technique based on requirements and existing soil performance
Most important limitations are: Soil type and
behavior Depth of treatment
23-Aug-18 Presentation
11
Treatment TechniquesRapid Impact Compaction (RIC) Low energy amplitude, high frequency Shallow zone of influence Fast and cheap
23-Aug-18 Presentation
12
~4m
Treatment TechniquesDynamic Compaction (DC) High energy amplitude, low frequency Deep zone of influence
23-Aug-18 Presentation
13
~8m
Treatment TechniquesDynamic Compaction (DC)
23-Aug-18 Presentation
14
Treatment TechniquesDynamic Replacement (DR) Used to reinforce non-compactable soil
(cohesive) with inclusions of granular fill material
Performed similar to DC Higher point energy used to drive material
inside the ground
23-Aug-18 Presentation
15
4-7m
Treatment TechniquesDC vs DR
23-Aug-18 Presentation
16
Treatment TechniquesStone Column (SC) AKA Vibro Replacement (VR) Rock aggregate columns usable to
reinforce most types of soil Relatively deep treatment depth
23-Aug-18 Presentation
17
10/16/40m
Treatment TechniquesSC InstallationDry Bottom Feed (DBF) Better quality
Wet Top Feed (WTF) Better penetration
23-Aug-18 Presentation
18
16m
40m
Treatment TechniquesOthers Vibro Compaction Roller/Impact Compaction Semi-Rigid Inclusion
o Controlled modulus columno Jet Grouting
Consolidationo Vertical Drains (+ surcharge)o Vacuum Bed
23-Aug-18 Presentation
19
23-Aug-18 Presentation
20
By Mechanical Modification
COMPACTION methods
Dynamic Compaction
Vibro Compaction
By Inclusions REINFORCEMENT methods
Semi-Rigid Inclusion (cement grout etc.)
Controlled ModulusColumns
Jet Grouting Columns
Dynamic Replacement
Vibro Replacement
Natural Inclusion (sand, stone, etc.)
By Hydraulic Modification
CONSOLIDATION methods
Vertical Drains
VacuumConsolidation
Treatment TechniquesProduction parameters
23-Aug-18 Presentation
21
D = √ W*H
Case StudyZayed City Package 4, Abu Dhabi
Zayed City is a key project of Plan Abu Dhabi 2030
“A livable and modern Arab capital” designed around 4 pillars of sustainability: Natural environment Economic development Cultural heritage Social Cohesion
The new seat of United Arab Emirates federal government
23-Aug-18 Presentation
22
Case StudyZayed City Package 4, Abu Dhabi
The full Zayed City development spans 4,500 hectares
Menard’s scope is the ground improvement of Package 4, a 500 hectare portion of the Emirati Neighbourhood residential area
Helsinki city centre for scale
23-Aug-18 Presentation
23
Case StudyRegional & general site stratigraphy
23-Aug-18 Presentation
24
Case StudySite characterization / Pre-CPTTesting interval 1 CPT / 625 m2
23-Aug-18 Presentation
25
Case StudyPre-treatment CPT examples
23-Aug-18 Presentation
26
A B C
Case StudyPre-treatment soil performanceMain criteria: Total Settlement < 20 mm & FoS liquefaction > 1.10
23-Aug-18 Presentation
27
A
B
C
Case StudySoil improvement design 5800 pre-treatment CPT
Compaction techniques in granular soil (DC & RIC)
Inclusion techniques in cohesive soil (DR & SC)
Liquefaction risk mitigation with SC
Total area treated is 214 ha
23-Aug-18 Presentation
28
Case StudyTypical soil improvement layouts
23-Aug-18 Presentation
29
Case StudyPost-treatment quality controlPurpose is to confirm that the specified requirements are met
10000 post-treatment CPT
344 Plate load test (PLT)o To assess quality of
stone columns
48 Zone load test (ZLT)o Simulation of actual
footing behavior under design load
o Expensive
23-Aug-18 Presentation
30
A BC
Case StudyPost-Treatment Soil ParametersRIC, DC & DR
23-Aug-18 Presentation
31
1234-2
-1
0
1
2
3
4
50 5 10 15 20 25 30
Soil Index Behavior Type (Ic)
Elev
atio
n (m
NAD
D)
Tip Resistance (MPa)
Tip Resistance (MPa)Pre-Test Tip Resistance (Mpa)B test Tip Resistance (MPa)C test Tip Resistance (MPa)Pre-Test Soil Behaviour Type Index [Ic]Ic = 2.2
1234-2
-1
0
1
2
3
4
50 5 10 15 20 25 30
Soil Index Behavior Type (Ic)
Elev
atio
n (m
NAD
D)
Tip Resistance (MPa)
Tip Resistance (MPa)Pre-Test Tip Resistance (Mpa)A test Tip Resistance (MPa)B test Tip Resistance (MPa)C test Tip Resistance (MPa)Pre-Test Soil Behaviour Type Index [Ic]Ic = 2.2
1234-2
-1
0
1
2
3
4
50 5 10 15 20 25 30
Soil Index Behavior Type (Ic)
Elev
atio
n (m
NAD
D)
Tip Resistance (MPa)
Tip Resistance (MPa)Pre-Test Tip Resistance (Mpa)B test Tip Resistance (MPa)C test Tip Resistance (MPa)Pre-Test Soil Behaviour Type Index [Ic]Ic = 2.2
Case StudyZone Load test – DR & SC
23-Aug-18 Presentation
32
0
5
10
15
20
25
30
35
40
45
50
Tota
l set
tlem
ent (
mm
)
zlt pre Linear (pre)
Thank you for your attentionAny questions?
Markus NapariM: +971 (0)54 305 9066@: [email protected]
23-Aug-18 Presentation 33