AL-Kinani 2020 IOP Conf. Ser. Mater. Sci. Eng. 737 012083
AL-Kinani 2020 IOP Conf. Ser. Mater. Sci. Eng. 737 012083
AL-Kinani 2020 IOP Conf. Ser. Mater. Sci. Eng. 737 012083
To cite this article: Ali M AL-Kinani and Mahmood D Ahmed 2020 IOP Conf. Ser.: Mater. Sci. Eng.
737 012083
Email: al1984kinani@gmail.com
1. Introduction
Jet under high pressure is widely used in the industry, while in construction of civil engineering are
most significantly used to cut soil structures in-situ the high velocity of jetting material are used for
ground improvement [1]. Jet grouting is a soil treatment technique adopting a high hydraulic energy to
destroy the surrounding soil. Ground improvement by Jet grouting technology can be used in varied
and difficult geological and geotechnical situations, showing its practical and economic advantages, in
addition to the importance of the performance control on the site, before and during the construction of
the final foundations [2]. When soil particles were excavated then spoil outside the hole and recouped
with cementing materials such as Portland cement to create a soil cement column aspect (soilcrete) [3]
Construction of spoil, which could then again be recycled or integrated on the ground works [4]. When
designing jet injection columns, change in the length of the jet grout columns and soil conditions must
be carefully and correctly defined [5]. Jet grouting has increasing uses in the last few years in ground
improvement that has low strength, permeability and seepage problems. Jet Grouting has high
potential application to decrease settlement in embankments [6]. Soft soil development technologies
based on chemical effects, such as deep mixing and jet grouting are usually accepted to improve
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IOP Conf. Series: Materials Science and Engineering 737 (2020) 012083 doi:10.1088/1757-899X/737/1/012083
stability when substructures are constructed in soft sediments. According to the interaction between
the jet grout column installations of soil-cement reinforcing elements significantly increase the
serviceability of the foundation by ways of increasing its strain features and active protection of soils
from the effect of the seismic vibrations, as long as for the safe operation of the sporting structure [7].
The jet grouting method is one of the greatest common techniques for strengthening soft soils. Jet
grouting columns allow for transmitting substantial loads through the reinforced soft soils and reduce
the construction's settlement [8] [9]. The major factors that effect jet grouting columns geometry are
soil property and technical parameters of the jet grouting system such as jetting pressure, size of
nozzles and rotation speed during jet grouting [10].
(Meyers et al., 2003) calculated the strength parameters of jet grouting columns structured in a firm to
soft soil deposit as follows: The UCS of soilcrete was near 3.5 (MPa). According to the concrete
design requirements, the tensile strength of concrete was given to be 520 times of these square root of
the unconfined compressive strength of conventional concrete 0.972(MPa). The compressive and the
tensile strength amounts were then used to draw a Mohr’s circle and the envelope of failure described
by these circles provided the predictable soilcrete shear strength limits. Meyers et al. also noticed that
C equal to 0.9 (MPa) and ∅= 340 [13]. (Nikbakhtan and Osanloo, 2009) examined the effects of the
clay soil properties improved by the jet grouting process before and after the processes, and the grout
flow and grout pressure effects on soilcrete unconfined compression strength (UCS). The study
showed that the UCS in (MPa) of soil increases logarithmically by raising the grout pressure and flow
[14]. (Akinpelu, et al., 2017) researched both experimentally and analytically the relationship
between the tensile strength and the compressive strength of both vibrated concrete (VC) and self-
compacting concrete (SCC) of the same grades. Both kinds of concrete were designed so that the level
of compressive strength of 20 (N / mm3), 30 (N/mm3) and 40 (N/mm3) is achieved at 28th days. As a
result, the results showed that the relation of the tensile to compressive strengths for VC and SC
reduces by rising compressive strength [15].
Li and Liang (2009) [16] conducted a series of laboratory tests on silt-cement samples with an
amount of cement about 20% by weight. Their test calculations exhibited that the variety of internal
friction angle reaches about from 32o to 38o, which is close to the conclusions of Balmer (1958).
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IOP Conf. Series: Materials Science and Engineering 737 (2020) 012083 doi:10.1088/1757-899X/737/1/012083
simulation of jet grouting in a field with the real soil condition and with actual jet grouting parameters
and instruments.
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IOP Conf. Series: Materials Science and Engineering 737 (2020) 012083 doi:10.1088/1757-899X/737/1/012083
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IOP Conf. Series: Materials Science and Engineering 737 (2020) 012083 doi:10.1088/1757-899X/737/1/012083
rotation, rod vertical motion and the length to width ratio (L/d) etc. The Jet grout column diameter was
150, 200 (mm), and the total length was 2000 (mm) and the (L/d) ratio was 13.3 for the single and
group columns with centre to centre clear distance (S=3D). The drilling tools generally rotated at a
continuous rate 30 (rpm) to erode the soil and create column geometry. Therefore, after the erosion
process is done, the high pressure of grout slurry (Portland cement and water) was 6-10 (bar) with
water cement ratio (1:1) is injected into the hole. In general, the setting time of the hardening slurry
and soil mixture was 24 (hr). On the other hand, the total time of the process to complete the drill
borehole by water jetting and slurry injection to build up the soilcrete was 2 (hr). The overall
construction works of group are represented in Figure 3.
Figure 3: Construction steps of single and group jet grout soil-cement column
(D=150 and 200 mm & L=2000 mm).
The effects of jet grouting activity on the soil properties before and after the processes can be
estimated by uniaxial compression strength (UCS). After completing the pile load test process a series
of core barrel samples were taken from different depth of jet grouting columns by using the continued
Coring method. Based on the results of the unconfined compressive test a total 18 samples in different
ages, including 1, 6, 12 (month) were used for analysis of strength of jet grouting columns. The
average of unconfined compression strength of jet grouting soil cement column results is illustrated in
Table 4. Therefore, the result shows that the jet grouting produces an increase in unconfined
compression strength of the soil.
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IOP Conf. Series: Materials Science and Engineering 737 (2020) 012083 doi:10.1088/1757-899X/737/1/012083
The strength properties of the jet grouting columns are represented by the cohesion and internal
friction angle. In other words, the compressive strength of jet-grouting cement soil is the important
step for the design of jet grouting functions progress. Different methods have been used to estimate the
cohesion and internal friction angle. The relationship between the split tensile and the compressive
strength results will be used to draw Mohr’s Circles and failure enveloped even to estimate the shear
strength parameters. According to that there are a lot of Mohr’s Circles that can plotted according to
the values of unconfined compression test for jet grouted column that is explained in Table 4. The
results of tensile strength based of many theories are illustrated in Table 5 and Mohr’s Circles and
failure enveloped in Figure 4. The shear strength (Cu) and internal friction of jet grouting column can
represented in Table 6 based on Mohr’s Circles theory and other methods.
The process of jet grouting is influenced by several parameters of the soft soil and the jet grouting
method, the effects on the soil properties before and after jetting, and the influences of jetting pressure,
age of curing and unconfined compression strength of soilcrete’s strength. According to the data
results obtained from field and experiments, it can be concluded that:
1- Unconfined compression results of soil treated by jet grouting column increase with increasing the
jetting pressure as shown in Figure 5 and Figure 6. Thus, these results are in line with
(Nikbakhtan and Osanloo, 2008), as explained above.
2- Unconfined compression results of soil treated by the jet grouting column increase with increasing
average tensile strength of the jet grouting soilcrete as shown in Figure 7. These results are in line
with (Akinpelu, et al. 2017).
3- The average cohesion results of soil treated by jet grouting increase with increasing average
unconfined compressive strength of soilcrete as shown in Figure 8, and it can be concluded that
the results are in good agreement when compared to the field cohesion of soilcrete based on
Mohr’s Circle with experimental equations explained by Mitchell, 1976.
Table 5: Evaluation of splitting tensile strength based on unconfined compressive strength from
different model.
Average Split Tensile Strength (N/mm2)(T)
Unconfined
compressiv
e strength ACI CEB- Carino and Oluokun et Arioglu et Lavanya Average
qu (N/mm2) Committee FIB(1991)[1 lew al. al.(2006)[21 and jegan Tensile
318 8] (1982)[19] (1991)[20] ] (2015)[22] Strength
(2014)[17] N/mm2
T1 = 0.56* T2 = 0.3* T3 = 0.272* T4 = 0.294* T5 = 0.387* T6 = 0.249*
qu 0.5 qu 0.66 qu 0.71 qu 0.69 qu 0.63 qu 0.772
2.78 0.93 0.59 0.56 0.60 0.74 0.55 0.66
3.34 1.02 0.66 0.64 0.67 0.83 0.63 0.74
4.21 1.15 0.77 0.75 0.79 0.96 0.76 0.86
3.68 1.07 0.71 0.68 0.72 0.88 0.68 0.79
4.62 1.20 0.82 0.81 0.85 1.01 0.81 0.92
5.52 1.32 0.93 0.91 0.96 1.14 0.93 1.02
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IOP Conf. Series: Materials Science and Engineering 737 (2020) 012083 doi:10.1088/1757-899X/737/1/012083
Figure 4: Estimation of shear strength of jet grouted soil cement column from compressive strength
and split tensile strength.
Table 6: Evaluation of the shear strength (cu) and internal friction (∅) of jet grouting column.
Average Average Pressure Column Age Angle of friction Cohesion (cu)
Unconfined Split (bar) Diameter (month) (∅)degree
compressive Tensile (mm) (N/mm2)
strength qu Strength
(N/mm2) (N/mm2)
[77] [76] [75] [74] [73] [72] M [71] M [70] M [69] M
o i o i
h t h t
r c r c
’ h ’ h
s e s e
l l
C l C l
i i
r ( r (
c 1 c 1
l 9 l 9
7
BCEE4 IOP Publishing
IOP Conf. Series: Materials Science and Engineering 737 (2020) 012083 doi:10.1088/1757-899X/737/1/012083
e 7 e 7
s 6 s 6
) )
t t
h h
e e
o o
r r
y y
[89] 2.78 [88] 0. [87] 75 [86] 150 [85] 1 [84] 3 [80] [79] 0 [78] 0
6 [81]
8 . .
6 [82] 6 6
[83] 3 8 7
[97] 3.34 [96] 0. [95] 75 [94] 150 [93] 6 [92] 4 [91]
8 0 [90] 0
7 0 - . .
4 4 7 8
3 8 0
[105] 4.21 [104] 0. [103] 75 [102] 150 [101] 1 [100] 4 [99] 0 [98] 1
8 2 1 . .
6 9 0
6 0
[113] 3.68 [112] 0. [111] 125 [110] 200 [109] 1 [108] 3 [107] 0 [106] 0
7 8 . .
9 8 8
6 7
[121] 4.62 [120] 0. [119] 125 [118] 200 [117] 6 [116] 4 [115] 1 [114] 1
9 2 . .
2 0 0
3 9
[129] 5.52 [128] 1. [127] 125 [126] 200 [125] 1 [124] 4 [123] 1 [122] 1
0 2 4 . .
2 1 2
8 9
6000 6000
Average Unconfined compressive strength-kPa
5000 5000
4000 4000
kPa
3000 3000
2000 2000
1000
1000
0
0
60 70 80 90 100 110 120 130
5 5.5 6 6.5 7 7.5 8 8.5
Jetting water pressure -bar
Jet Grout pressure -bar
Figure 5: Relationship between water jetting Figure 6: Relationship between grout jetting
pressure and average unconfined compressive pressure and average unconfined compressive
strength. strength
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IOP Conf. Series: Materials Science and Engineering 737 (2020) 012083 doi:10.1088/1757-899X/737/1/012083
Mohr's
5000 Circle's
1200
a) based on
1000 Mitchell,197
3000 6
900
2000 Linear
800 (Cohesion(k
Pa) -Based
1000 700 Mohr's
Circle's)
600
0
540 640 740 840 940 1040 1140 500
2500 3500 4500 5500 6500
Average Tensile strength -kPa UCS (kPa)
Figure 7: Relationship between average tensile of Figure 8: Relationship between average cohesion
jet grouting soilcrete and of jet grouting soilcrete and average unconfined
average unconfined compressive strength. compressive strength.
Conclusion
Although the use of jet grouting in the last few years is very common in foundation constructions, an
estimated strength of soil-cement column is still based on simple assumptions that often come from
accumulated deep foundations practice. Field work studies can be characteristic of jet grout soil-
cement column response to certain interactions with the surrounding soil, effect of jet grouting
operation parameters and grouting materials because of facility difficulties, dimensions, physical and
mechanical properties of jet grout columns. As a result, the effects of jet grouting method on the soil
properties before and after the processes can be estimated by uniaxial compression strength (UCS).
Therefore, the result shows that the jet grouting produces an increase in unconfined compression
strength of the soil from (36-40) kPa to average (4) MPa.
Acknowledgments
The research work described herein was corresponding by author Ali M. AL-Kinania.
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