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Journal ArticleDOI

Undrained strength characteristics of an artificially cemented marine clay

01 Oct 1998-Marine Georesources & Geotechnology (Taylor & Francis Group)-Vol. 16, Iss: 4, pp 335-353
TL;DR: A series of isotropically consolidated undrained triaxial tests has been performed on an artificially cemented marine clay using lime as an additive as discussed by the authors, and the results show that cemented soils display smaller strain at failure, higher strength, a gradual reduction in shearing resistance with increase in consolidation pressure, and a nonlinear failure envelope in effective stresses.
Abstract: A series of isotropically consolidated undrained triaxial tests has been performed on an artificially cemented marine clay using lime as an additive. This procedure is helpful to simulate the behavior of naturally cemented marine clays often found in many coastal and offshore areas. By comparing the undrained shear behavior of artificially cemented samples with the available data on the naturally cemented marine clays, the effect of cementation on the mechanical properties of clays is evaluated. The results show that cemented soils display smaller strain at failure, higher strength, a gradual reduction in shearing resistance with increase in consolidation pressure, and a nonlinear failure envelope in effective stresses. Within the degree of cementation considered in this study, the cementation is shown to have little affect on the generation of pore pressure. The article discusses the phenomenon of a “phase transformation”; and its relation to the existence of bisegmental stress‐strain behavior, typical o...
Citations
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Journal ArticleDOI
TL;DR: In this paper, a series of monotonic triaxial tests and long-term cyclic (50,000 cycles) TRIAXial tests have been carried out to investigate the undrained deformation behavior of undisturbed soft clay from Wenzhou, China.

171 citations

Journal ArticleDOI
TL;DR: In this article, a constitutive model for cemented clays, referred to as the Cemented Cam Clay model (CCC), was proposed to simulate the cementation degradation during loading.

103 citations


Cites background from "Undrained strength characteristics ..."

  • ...As a result, the failure envelope of cemented clays gradually approaches to the remoulded clay-cement mixture as observed by Moses et al. (2003); Panda and Rao (1998) and Lo and Wardani (1999)....

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  • ...Figure 3 displays a predicted failure envelope (Equation 9) for a set of triaxial tests from Indian marine clay performed by Panda and Rao (1998)....

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  • ...As suggested by Moses et al. (2003); Panda and Rao (1998) and Lo and Wardani (1999), when the confining pressure increases, the beneficial effects of cementation may diminish as a result of cementation degradation....

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  • ...This indicates that the behaviour of cemented clay is similar to overconsolidated soil and the cemented clay is more structured due to chemically induced cementation (Panda and Rao, 1998; Yin, 2001)....

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Journal ArticleDOI
TL;DR: In this article, a series of monotonic and cyclic triaxial shear tests were carried out to study the influence of the strain effect and load cycles on the undrained shear strength of a cemented marine clay from the East coast of India.

88 citations

Journal ArticleDOI
TL;DR: In this paper, a literature review and collecting information on the application of polyurethane chemical grout for improving the properties of weak soils has been conducted and the review concluded that improved polyurethsane has the potential to improve weak soil types for infrastructure development.

86 citations

Journal ArticleDOI
TL;DR: In this article, a bioencapsulation method was used to increase the unconfined compressive strength of marine clay aggregates with a size of 5mm from almost zero to more than 2MPa.
Abstract: Dredged or excavated soft marine clay can be improved by mixing it with cement or lime. However, these treatments are usually expensive. It is shown in this paper that soft marine clay can be strengthened through a bioencapsulation method in which the shear strength of clay aggregates can be substantially increased after the aggregates are treated with urease-producing bacteria, calcium chloride, and urea. We found that the bioencapsulation had increased the unconfined compressive strength of marine clay aggregates with a size of 5 mm from almost zero to more than 2 MPa. The strength of the bioencapsulated clay aggregates decreases with the increase in the size of the aggregate when the size is greater than 5 mm.

55 citations

References
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Journal ArticleDOI
TL;DR: In this article, the pore pressure coefficients A and B were derived and some typical values of the experimentally determined pore-pressure coefficients were given, and some practical applications of these coefficients have been outlined by Bishop.
Abstract: Synopsis In a number of problems involving the undrained shear strength of soils (especially in the design of earth dams) the change in pore pressure Δu occurring under changes in total stresses must be known. The equation Δu = B[Δσ3 + A(Δσ1 − Δσ3] is derived, and some typical values of the experimentally determined pore-pressure coefficients A and B are given. Some practical applications of these coefficients have been outlined by Bishop (1954). Pour un certain nombre de problemes comportant la resistance au cisaillement a teneur en eau constante des sols (en particulier, pour le calcul des barrages en terre), il est necessaire de connaltre les changements dans la pression interstitielle Δu qui se produisent lors des changements dans les contraintes totales. L'equation Δu = B[Δσ3 + A(Δσ1 − Δσ3] est derivee et certaines valeurs typiques des coefficients A et B de pression interstitielle obtenues experimentalement sont donnees dans cet article. Certaines applications pratiques de ces coefficients ont ete e...

1,514 citations

Journal ArticleDOI
TL;DR: In this paper, a laboratory investigation on the quicklime stabilization of sensitive clays has shown that significant strength increase can be obtained if enough water content above the liquid limit is added to the clays.
Abstract: A laboratory investigation on the quicklime stabilization of sensitive clays has shown that, even at a water content above the liquid limit, significant strength increase can be obtained if enough ...

261 citations

Journal Article
TL;DR: In this article, the authors presented the physical characteristics, index properties, unconfined compressive strength and compressibility characteristics of cement-treated soft Bangkok clay for 28-day curing time.
Abstract: This paper presents the physical characteristics, index properties, unconfined compressive strength and compressibility characteristics of cement-treated soft Bangkok clay. The cement-treated samples have reduced water contents and the reduction ceased after 30% cement content. The change in the liquid limit were insignificant while the plastic limit significantly increased. The unconfined compressive strength increased from 15 kPa to 35 kPa with cement content of 10% to 20% for curing time of 28 days. The undrained behavior of cement-treated clays corresponded to 3 zones, namely: Zone I (untreated), Zone II (treated), and Zone III (softening part). Phase transformation was manifested by the abrupt change in the curvature of the stress paths. Higher cement content as much as 10% to 25% was found effective in reducing the compressibility of the clay. For cement-treated clays, the coefficient of consolidation increased by 12 to 19 times with the highest increase at 15% cement content. The reduction of compression index reach optimum also at 15% cement content.

140 citations

Journal ArticleDOI
TL;DR: In this paper, the beneficial changes occurred in a marine clay due to the diffusion of lime from lime column and lime injected points have been studied using XRD and SEM techniques and new compounds formed have been identified using the XRD technique.
Abstract: The use of lime to improve the behavior of marine clays has been in practice in several parts of the world over a long period. In this paper, the beneficial changes occurred in a marine clay due to the diffusion of lime from lime column and lime injected points have been studied using XRD and SEM techniques. The new compounds formed have been identified using the XRD technique. The diffusion of lime has been established through the measurements of lime content and pH from the samples taken at different locations and at various time periods. The transformation of the soil particles due to lime attack on the clay minerals present in a marine clay has been studied and discussed.

111 citations