Swelling pressure of sodium montmorillonites

Sridharan, A.; Choudhury, Deepankar

doi:10.1680/geot.52.6.459.38745

Cited by 6 publications

(7 citation statements)

References 7 publications

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“…Soil behaviour concerning to the water flow, pore water exclusion, soil deformation and consolidation requires a knowledge of characteristics of water movement in the macro and micro pores and also of rearrangement of fabric units. For example, Sridharan [41] and Sridharan et al [45,69] showed for partly saturated soils that the finer pores had significant bearing on the soil shear strength characteristics. The narrow pores mobilise significant matric suction leading to larger shear strength values.…”

Section: Pore Spaces and Fabricmentioning

confidence: 99%

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Fourth IGS-Ferroco Terzaghi Oration: 2014

Sridharan

2014

Indian Geotech J

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Engineering behavior of fine-grained soils depends upon the clay mineralogical composition of the soils and the pore medium chemistry as well. A greater part of the soil-pore liquid interaction is both physical and physico-chemical in nature. This can be attributed to the charge deficiency on the surfaces and edges of the clay platelets and the associated electrical attractive and repulsive forces. Clay minerals that are present in the finegrained soils can be broadly grouped into kaolinitic and montmorillonitic types. This paper discusses in detail the physical and engineering behavior of fine-grained soils as influenced by the dominant clay minerals composing them and by the pore medium chemistry. It has been brought that the liquid limit, sediment volume, undrained shear strength and compressibility behavior of kaolinitic and montmorillonitic clayey soils are quite opposite to changes in the pore medium chemistry. The drained strength and secondary compression coefficient of both kaolinitic and montmorillonitic fine-grained soils are primarily controlled by the modified effective stress (i.e., net contact stress at the particle level), which takes into consideration both attractive and repulsive forces in addition to the conventional effective stress. The hydraulic conductivity of fine-grained soils is significantly influenced by the nature of the fluid, especially so in montmorillonitic soils.

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Section: Pore Spaces and Fabricmentioning

confidence: 99%

“…The validity of Eqs. (10) and (11) have been qualitatively studied extensively considering the volume change behaviour [62,65], the strength behaviour [1,45,54,60,64,69], the shrinkage phenomena [61], the secondary compression behaviour [59] and the sediment formation [53].…”

Section: Effective Stress Conceptmentioning

confidence: 99%

Fourth IGS-Ferroco Terzaghi Oration: 2014

Sridharan

2014

Indian Geotech J

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“…According to the fundamental concepts of soil mechanics the placement of an external load on a low-permeable soil layer will induce excess pore water pressure, causing a consolidation process in which pore water is squeezed out of the soil, accompanied by a gradual increase in effective stress and a corresponding decrease in excess pore water pressure (Hansbo 1979). Fundamentals of such mechanics for soft clay soil rich with montmorillonites were reported by Sridharan 2 and Choudhury (2002) which essentially needs modification for further use in civil engineering constructions. Hence, a number of ground improvement techniques has been used by several researchers in the last past decade (Choudhury et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Ground Improvement of Marine Clay for Highway Construction in Mumbai, India

Desai¹,

Choudhury²,

Salunkhe³

2015

Ifcee 2015

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Ground improvement of marine clays is the most inventive field of geotechnical engineering. Various techniques such as use of prefabricated vertical drains (PVDs), vacuum consolidation, stone columns etc. are available for improving the mechanical and engineering properties of the marine clays. In the present paper, the use of PVDs with preload for improving the soft marine clay that support the sub grade of State Highway No. 54 from Panvel to Uran at Mumbai, India is studied. The 3.25km stretch of marine clay was present up to a depth of 12-15m. As the road connects to the Jawaharlal Nehru Port (India's major hub port) road, heavy traffic is expected to be moving through this road. Staged embankment construction of 4.30m height with PVDs was employed to sustain the heavy vehicular traffic load and to reduce the post-construction settlement. A total of 650 thousand running meter PVDs were installed at a spacing of 1.20m. The 4.30m high preload was kept in stages for a period of 6months. Various instruments were installed to monitor the pore water pressure, settlement and lateral displacements. The substantial settlement of 636mm was achieved during this period.

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“…The relations between index and engineering properties are confirmed in the literature by analyzing the variations in the equivalent DDL thickness due to the changes in pore-fluid characteristics for given clay-electrolyte systems. The mechanisms by which equivalent DDL thickness influences the liquid limit (Sridharan et al, 1986;Lambe and Whitman, 1979), sediment volume (Chen and Anadarajah, 1998;Sridharan and Prakash, 1999a), hydraulic conductivity (Fernandez and Quigley, 1985;Sridharan and Choudhury, 2002), and undrained shear strength (Sridharan and Prakash, 1999b) have been well documented. The relations between clay-surface properties and equivalent DDL thickness are also well known (Muhunthan, 1994).…”

Section: Introductionmentioning

confidence: 99%

A Critical Appraisal of Debye Length in Clay-Electrolyte Systems

Bharat

Sridharan

2015

Clays and clay miner.

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The equivalent diffuse double layer (DDL) thickness in clay-electrolyte systems is a very useful parameter for analyzing the engineering behavior of clays under different environmental conditions. The equivalent DDL thickness is generally assumed to be equal to the characteristic (Debye) length. The present work examined critically the applicability of characteristic length to define equivalent DDL thickness under various clay-surface and pore-fluid conditions. A critical analysis is presented of the changes in the equivalent DDL thickness and characteristic length under the influence of different clay-surface and electrolyte properties. The equivalent DDL thickness was found to be smaller than the characteristic length for a wide range of surface and pore-fluid parameters normally encountered in engineering practice. An accurate and simple power relationship was developed to predict the equivalent DDL thickness from the characteristic length, which is applicable to a wide range of clay-electrolyte systems.

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Swelling pressure of sodium montmorillonites

Cited by 6 publications

References 7 publications

Fourth IGS-Ferroco Terzaghi Oration: 2014

Fourth IGS-Ferroco Terzaghi Oration: 2014

Ground Improvement of Marine Clay for Highway Construction in Mumbai, India

A Critical Appraisal of Debye Length in Clay-Electrolyte Systems

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