Geoenvironmental Testing

Delage, Pierre; Romero, E.

doi:10.1007/s10706-008-9199-y

Cited by 9 publications

(2 citation statements)

References 85 publications

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“…The hydro-mechanical behaviour of compacted expansive clay is one of the key issues in geotechnical and geoenvironmental engineering: structural and pavement damage due to expansive clays [1]; seasonal changes in embankments and dams [2]; soil-structure interaction caused by shrinkage and swelling of expansive soils [3]; geological high-level radioactive wastes disposal [4]; and surface wastes disposal [5][6]. In order to investigate the hydro-mechanical behaviour of compacted expansive clay in laboratory, suction-controlled oedometer tests are usually performed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the hydro-mechanical behaviour of compacted expansive clay

Cui

Tang

et al. 2010

Front. Archit. Civ. Eng. China

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International audienceThe hydro-mechanical behaviour of compacted expansive Romainville clay was investigated. The soil was air-dried, crushed, and passed through a 2 mm sieve before being statically compacted to a dry density of 1.35 Mg/m3. The mechanical behaviour was investigated by tests in oedometer with controlled suction using the vapor equilibrium technique (suction s = 0, 9, 39, and 110 MPa). The vertical stress was applied in the range of 0-800 kPa. The experimental results are shown as follows: 1) wetting-induced swelling was higher at lower vertical stresses; 2) the vertical stress under which no swelling occurred during water flooding was estimated at 60 kPa, which can be considered as the swelling pressure of the soil tested; 3) the soil compressibility (changes of volume upon stress increases) was strongly influenced by the soil suction: the lower the suction, the higher the compressibility. The hydraulic behaviour was investigated using a large-scale inltration chamber (800 mm × 1000 mm in section and 1000 mm high). The large size of the soil column allowed burying the volumetric water content sensors (ThetaProbe) without signicantly affecting the water transfer and the soil swelling during inltration. The soil suction was monitored along the soil height (every 100 mm) using various relative humidity sensors and psychrometers. In the inltration test, water was kept on the soil surface and changes in suction and volumetric water content were monitored for 338 d. The wetting front has reached the bottom of the soil column at the end of the test. The data from the simultaneous monitoring of suction and water content were used to determine the water retention curve and the unsaturated hydraulic conductivity using the instantaneous prole method. It has been observed that the soil water retention curve depends on the soil depth; that is to be related to the soil depth-dependent swelling. The unsaturated hydraulic conductivity was found to be quite low, comprised between 3 × 10−11 m/s (at saturated state) and 10−14 m/s (at about 100 MPa suction)

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Section: Introductionmentioning

confidence: 99%

Investigation of the hydro-mechanical behaviour of compacted expansive clay

Cui

Tang

et al. 2010

Front. Archit. Civ. Eng. China

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“…The water transfer in compacted expansive soil is a key issue in geotechnical and geoenvironmental engineering: in the safety assessment of geological radioactive disposal (Alonso et al, 2008) and surface waste disposal (Chapuis, 2002;Albright et al, 2006;Delage and Romero, 2008); in the analysis of the impact of seasonal changes on the behavior of embankments and dams (Ridley et al, 2003); in the analysis of soil-structure interaction caused by swell/shrinkage of expansive soils (Abduljauwad et al, 1998); in the assessment of surficial stability of compacted clay slopes (Day and Axten, 1989;Aubeny and Lytton, 2004). From an experimental point of view, the water transfer analysis requires measurement of soil suction or water content.…”

Section: Introductionmentioning

confidence: 99%

Development of a Large-Scale Infiltration Tank for Determination of the Hydraulic Properties of Expansive Clays

Tang

Cui

et al. 2009

Geotechnical Testing Journal

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A large-scale infiltration tank was developed to study the water transfer in compacted expansive clay. Volumetric water content sensors were buried in a soil column for water content monitoring during infiltration. In addition to water content, soil suction and temperature at various locations and the heave at the soil surface were also monitored. Emphasis was put in minimizing the effect of sensors installation on water transfer and soil deformation. The results obtained for 338 days of infiltration were presented in terms of changes in suction, volumetric water content, temperature, and the soil heave. Based on the recorded data, the performance and limitation of different suction and volumetric water content sensors and the adopted test procedure were analyzed. The recorded data on soil suction and volumetric water content were finally analyzed for determining the unsaturated hydraulic properties of soil, such as the water retention curve and the unsaturated hydraulic conductivity. Note also that the results constitute useful data for further physical analysis or numerical models’ calibration.

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Osmotic Swelling and Osmotic Consolidation Behaviour of Compacted Expansive Clay

Thyagaraj

Rao

2012

Geotech Geol Eng

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Geoenvironmental Testing

Cited by 9 publications

References 85 publications

Investigation of the hydro-mechanical behaviour of compacted expansive clay

Investigation of the hydro-mechanical behaviour of compacted expansive clay

Development of a Large-Scale Infiltration Tank for Determination of the Hydraulic Properties of Expansive Clays

Osmotic Swelling and Osmotic Consolidation Behaviour of Compacted Expansive Clay

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