<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Cement-slag-bentonite slurry walls are self-hardening structures, and they are mainly used to retard contamination transport into the groundwater stream. Whilst permeability of a mixture is an initial criterion in slurry wall design and material selection, long-term performance is mainly influenced by curing ages and stress-state caused by adjacent soil. In this study, the steady-state of effective stresses at 7 days and 28 days of curing age is predicted. The effect of the modulus of horizontal subgrade reaction, interface friction, and transition of the earth pressure from at-rest to the active condition was applied to develop the model. Unlike the quantities that the geostatic model presented, this method gives a slight decrease of stresses after a certain depth, and the trend is in good agreement with trends provided by previous studies. Furthermore, the predicted stresses are then applied to estimate the permeability of the wall at each depth and compare it with those obtained in the laboratory. Finally, predicted effective stresses stay lower than geostatic stress, and the slurry wall consolidation along with the sidewalls’ lateral squeezing leads to keeping the stress state under control.</p>
</abstract>

Cement-slag-bentonite slurry walls are self-hardening structures, and they are mainly used to retard contamination transport into the groundwater stream. Whilst permeability of a mixture is an initial criterion in slurry wall design and material selection, long-term performance is mainly influenced by curing ages and stress-state caused by adjacent soil. In this study, the steady-state of effective stresses at 7 days and 28 days of curing age is predicted. The effect of the modulus of horizontal subgrade reaction, interface friction, and transition of the earth pressure from at-rest to the active condition was applied to develop the model. Unlike the quantities that the geostatic model presented, this method gives a slight decrease of stresses after a certain depth, and the trend is in good agreement with trends provided by previous studies. Furthermore, the predicted stresses are then applied to estimate the permeability of the wall at each depth and compare it with those obtained in the laboratory. Finally, predicted effective stresses stay lower than geostatic stress, and the slurry wall consolidation along with the sidewalls’ lateral squeezing leads to keeping the stress state under control.

Lateral squeezing effects on cement-slag-bentonite slurry wall performance

Materials and Geoenvironment

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Lateral squeezing effects on cement-slag-bentonite slurry wall performance"}

Cement-slag-bentonite slurry walls are self-hardening structures, and they are mainly used to retard contamination transport into the groundwater stream....

Parameter	Unit	C50-S50-B5			C50-S45-L5-B9
		Curing age (days)
		7	28		7		28
		Value
Gs	/		2.76			2.70
LL	%		42			62
PI	%		15			38
Clay Size	%			17		17
Silt Size	%			67		73
Sand Size	%		16			10
C_v	cm²/s	2.03×10^-3		1.24×10^-3	3.34×10^-4		3.0×10^-3
(q_u)	kPa	78		380	80		505

Parameter	Unit	C50-S50-B5		C50-S45-L5-B9
		Curing age (days)
		7	28	7	28
		Value
B	m		1.2*
H	m		30*
γ′_csb	kN/m³	11.9	13.8	12.3	12.6
υ	/	0.26	0.22	0.25	0.18
C′	kPa	66	133	67	160
Ø′	°	18	21	23	25
n_h	kN/m³		4500†
R	/		0.1—0.25‡

Lateral squeezing effects on cement-slag-bentonite slurry wall performance

Article Category: Original Scientific Article

Published Online: Sep 04, 2023

Page range: 57 - 68

Received: Oct 26, 2021

Accepted: Dec 06, 2021

DOI: https://doi.org/10.2478/rmzmag-2021-0008

Keywords
cement-slag-bentonite, compressibility, lateral squeezing, permeability, slurry wall

© 2021 Davood Talefirouz et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Consolidation and index properties.

Geometric and mixture properties.

Lateral squeezing effects on cement-slag-bentonite slurry wall performance

Article Category: Original Scientific Article

Published Online: Sep 04, 2023

Page range: 57 - 68

Received: Oct 26, 2021

Accepted: Dec 06, 2021

DOI: https://doi.org/10.2478/rmzmag-2021-0008

Keywordscement-slag-bentonite, compressibility, lateral squeezing, permeability, slurry wall

© 2021 Davood Talefirouz et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Consolidation and index properties.

Geometric and mixture properties.

Keywords
cement-slag-bentonite, compressibility, lateral squeezing, permeability, slurry wall