The strength and deformation behaviour of a residual soil in Singapore

Meng, Guanghui

doi:10.32657/10356/42365

Cited by 2 publications

(3 citation statements)

References 106 publications

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“…implies an increase in pore water pressure, which in turn indicates normally consolidated (NC) behavior (Meng, 2010). This is also consistent with the effective stress paths showing in Fig.…”

Section: Direct Simple Shear (Dss) Tests On Kaolinsupporting

confidence: 87%

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Geotechnical properties of biocement treated sand and clay

Li¹

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This project would not have been possible and successful without the continuous guidance from my supervisor Prof Chu Jian. I would like to express the most sincere gratitude for his inspiration, patience and guidance. His endlessly support and invaluable experience came handy throughout all these years. His close monitoring and encouragement are especially appreciated. I would also like to express my special thanks to Prof Andrew Whittle and Dr Volodymyr Ivanov as co-supervisors. I sincerely thank them for the wonderful opportunity to be part of this project, and their patience, guidance and invaluable knowledge sharing. I wish to acknowledge the help provided by Mr. Heng Hiang Kim Vincent, Mr.

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Section: Direct Simple Shear (Dss) Tests On Kaolinsupporting

confidence: 87%

“…8.6b. As this is an undrained test and the total σ n is maintained constant, the change in the effective vertical stress is also the change in pore water pressure (Chu et al, 1999;Chu et al, 2003;Meng, 2010). A decrease in σ n '…”

Section: Direct Simple Shear (Dss) Tests On Kaolinmentioning

confidence: 99%

Geotechnical properties of biocement treated sand and clay

Li¹

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“…There were several studies in the literature on the K 0 consolidation behaviour of either naturally or artificially cemented sands (Maccarini, 1987;Zhu et al, 1995;Yun and Santamarina, 2005;Meng, 2010;Yun and Evans, 2011). Zhu et al (1995) found that the coefficient of lateral earth pressure at rest K 0 reduces with the Chapter 2 Literature Review 21 increase in cement content for sand and the imposed vertical stress will induce the breakage of cementation bonding inside the soil.…”

Section: Chaptermentioning

confidence: 99%

Engineering behaviour of artificially cemented sand : cement treatment versus biocement treatment

Wang¹

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The engineering properties of soil can be enhanced through artificial cementation which is realized by premixing or injecting chemical agents such as cement, lime and gypsum in soil. Biocementation of soil using biogenic cements has also been developed in recent years.In this thesis, the engineering behaviour of sand cemented using either cement or biocement was investigated. Cement-treated sand was prepared by mixing uncemented sand with Portland cement, while biocement-treated sand was made using the low-pH-one-phase-injection method via the microbially induced calcite precipitation (MICP) process. The differences and similarities in the cementation effects of the two different cementation materials and cementation processes were analysed.Drained and undrained shear behaviour of cemented sand were studied under both axisymmetric and plane-strain conditions using either triaxial or plane-strain apparatus. Under a drained axisymmetric condition, the stress-strain behaviour of cemented sand becomes brittle, and its volumetric deformation becomes dilative as compared with the ductile and compressive behaviour of the loose parent sand under the same conditions. The cementation effect was also affected by the effective confining stress. The lower the stress level, the more significant the cementation effect. Compared with cement-treated sand, biocement-treated sand with similar biocement content is more brittle with higher tangent modulus, but less dilation in general. The cementation effect and its mobilization could be analysed using an energy equation. The effect of cementation due to cement or biocement was dominated only at the early phase of shearing. During a drained triaxial test, the cementation effect was mobilized first while the dilation was restricted by bonding.With further shearing, bonding due to cementation began to break and the contribution of dilation increased. When dilation ceased to develop further, the shear Summary viii strength would be controlled mainly by friction. For both cement or biocement, cementation contributed mainly to the increase in the effective cohesion, but not much to the effective friction angle. The bonding or yielding stress increases with the increase in cement/biocement content. The bonding provided by biocement is stronger than that by cement.Under drained plane strain conditions, the bonding provided by cementation could be degraded during K 0 consolidation when the consolidation stress was higher than the yielding stress of the cemented soil. As a result, the stress-strain behaviour of cemented soil was affected by the consolidation state. When the mean effective consolidation stress was smaller than the mean yield stress, the shear stress versus shear strain curve of cemented sand could still be affected significantly by cementation as indicated by a steep peak in the stress-strain curve and the contractive volumetric strain. On the other hand, when the mean effective consolidation stress was greater than the mean yield stress, the stress-strain behaviour of cemente...

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The strength and deformation behaviour of a residual soil in Singapore

Cited by 2 publications

References 106 publications

Geotechnical properties of biocement treated sand and clay

Geotechnical properties of biocement treated sand and clay

Engineering behaviour of artificially cemented sand : cement treatment versus biocement treatment

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