SSC/Geocolumns SSC Technology MECTOOL Millgard Hayward Baker Method Hayward Baker Rotomix Inquip END E ROTARY R END E TurboMix Trevi ICOS HYDRAMECH Geocon GEOJET Condon Johnson Lim
Trang 7SSC/Geocolumns (SSC Technology)
MECTOOL (Millgard)
Hayward Baker Method (Hayward Baker)
Rotomix (Inquip)
END (E)
ROTARY (R)
END (E)
TurboMix (Trevi ICOS)
HYDRAMECH (Geocon)
GEOJET (Condon Johnson)
Lime-Cement Columns (Underpinning)
Trevimix (Trevi ICOS)
LiMix (Trevi ICOS and Hercules)
END (E)
SMW (SMV Seiko, Raito and others)
Multimix (Trevisani)
Mixed Wall (Schnabel Foundation)
SHAFT (S)
SLURRY (W)
DRY (D) DEEP MIXING METHODS
ROTARY + JET (J)
ROTARY (R)
DSM (Geocon) SWING (Spread Wing Raito)
DJM (Raito)
SSM (Geocon)Bruce and Bruce (2003)
Trang 8DEFINITIONS AND RELATIONSHIPS
Trang 9Water-to-cement ratio of slurry
Cement content on the dry-weight
Volume ratio
Cement dosage
Cement dosage in-place
Total water-to-cement ratio
c
slurry w
W
W c
w : ,
s
c w
W
W c
soil w slurry
w mix
Trang 10slurry d
slurry d
place in
s
s
wG S
wG VR
soil d
a VR
w
w VR
d
G c w
G
) : ( 1
Trang 11Modulus of elasticity, E50 350 to 1000 qu : trong phòng
150 to 500 qu : hiện trường direct shear 40 – 50% qu at qu < 1 Mpa
Tensile strength 8 – 14% qu
28-day qu (1.4 - 1.5) qu(7-day) for silts and clay
2 qu(7-day) for sands 60-day qu 1.5 qu(28-day),
(0.33 -1) qu(15 years)
Trang 14Ảnh hưởng của hàm lượng cement
After Bergado et al (1996)
Trang 15Ảnh hưởng của thời gian
(After Zeng et al., 1998)
Trang 18Ảnh hưởng của pH
Trang 20Ảnh hưởng của nhiệt độ
Trang 21ng (Consoli et al., 2000)
Trang 22
Trang 23Tương quan giữa phòng thí nghiện và hiện trường
(after Kamon, 1996)
L u F
q . 0 5 .
L u F
Trang 24Cường độ thiết kế dựa trên dữ liệu thu thập ngoài hiện trường
(Matsuo 1999)
Trang 26Cường Độ Chịu Kéo
(After Terashi et al 1980 )
Takenaka and Takenaka (1995) : 10-20%
Brandl (1981) : 10 – 15%
Kawasaki et al (1981) : 15 -20%
CDIT (Japan) : 15%
Trang 27Cường Độ Chịu Uốn
(After Terashi et al 1980 )
Kitazume et al (2000)
u col
Trang 28Áp lực tiền cố kết
(After Terashi et al 1980 )
Trang 29(Ekstrom 1994) Baker (2000); Broms (2003) Jacobson et al (2003)
Dry cement 65 – 250·qu
50 – 200·qu
50 – 200·qu
Baker (2000); Broms (2003) Yang et al (1998)
Ahnberg et al (1995) Wet cement 350 – 1,000·qu
100-250 qu140-500 qu
30 – 300·qu150·qu
350 – 800·qu
Kawasaki et al (1981) Futaki et al (1996) Asano et al (1996) Fang et al (2001) McGinn and O'Rourke (2003) Tan et al (2003)
Trang 30Diff erent dry weight rat io of cement t o clay Diff erent rat io of addit ional wat er t o cement
Biến dạng phá hoại
Trang 32Determination of design condition
Determination of dimensions for superstructure
Assumptions of dimensions for improved ground Strength, improvement range
and depth Improvement area ratio
Examination of sliding stability Slip circle analysis
Study of lateral displacement FEM analysis Examination of sliding stability
Examination of bearing capacity
Determination of design condition
Determination of dimensions for superstructure
Assumptions of dimensions for improved ground Strength, improvement range
and depth Improvement area ratio
Examination of sliding stability Slip circle analysis
Study of lateral displacement FEM analysis Examination of sliding stability
Examination of bearing capacity
Phương pháp đánh giá độ ổn định (CDIT 2002)
Examination of stabiity
Trang 33I E
S S
E
R S S
Pa Pa
' tan B W W
Pp Pa
Pa
F Pp FS
Trang 34s s col col e
e D
R
x W
l l
l R
tan
R centre of rotation
composite soil
Trang 35Sức chịu tải
Broms (1994), Bergado et al (1996), Kasali and Taki (2003)
Group of column Single column
Block failure Local failure
p p s s ult A f A q
u p
c f
c
q 9 Q ult,group 2c u HBL(6to9)c u HBL
)2.01(5.5,
l
b c
Trang 36Ứng suất đứng giới hạn
Tiêu chuẩn của Phần Lan
FS
u.col v.col
(
u a
q
Trang 37Xác định độ lún
Nhật
unstab stab S