Measurements of Soil Suction

2010 ◽

Author(s):

Pan Hu ◽

Qing Yang ◽

Maotian Luan

Keyword(s):

Soil Water ◽

Vapor Phase ◽

Unsaturated Soils ◽

Characteristic Curve ◽

Phase Method ◽

Soil Suction ◽

Compacted Bentonite ◽

Water Characteristics ◽

Wide Range ◽

High Level

The soil-water characteristic curve (SWCC) is a widely used experimental means for assessing fundamental properties of unsaturated soils for a wide range of soil suction values. The study of SWCC is helpful because some properties of unsaturated soils can be predicted from it. Nowadays, much attention has been paid to the behaviours of highly compacted bentonite-sand mixtures used in engineering barriers for high level radioactive nuclear waste disposal. It is very important to study the various performances of bentonite-sand mixtures in order to insure the safety of high-level radioactive waste (HLW) repository. After an introduction to vapor phase method and osmotic technique, a laboratory study has been carried out on compacted bentonite-sand mixtures. The SWCC of bentonite-sand mixtures has been obtained and analyzed. The results show that the vapor phase method and osmotic technique is suitable to the unsaturated soils with high and low suction.

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SOIL STRUCTURE IN RELATION TO SOIL SUCTION (pF)

Journal of Soil Science ◽

10.1111/j.1365-2389.1954.tb02177.x ◽

1954 ◽

Vol 5 (1) ◽

pp. 75-84 ◽

Cited By ~ 154

Author(s):

D. CRONEY ◽

J. D. COLEMAN

Keyword(s):

Soil Structure ◽

Soil Suction

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Effect of an Anionic Surfactant on the Clayey Soil Suction Behavior

Geo-Frontiers 2011 ◽

10.1061/41165(397)283 ◽

2011 ◽

Author(s):

Kalaiarasi Vembu ◽

C. Vipulanandan

Keyword(s):

Anionic Surfactant ◽

Clayey Soil ◽

Soil Suction

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Simulating transient infiltration in unsaturated soils

Canadian Geotechnical Journal ◽

10.1139/t98-059 ◽

1998 ◽

Vol 35 (6) ◽

pp. 1093-1100 ◽

Cited By ~ 6

Author(s):

J R McDougall ◽

I C Pyrah

Keyword(s):

Hydraulic Conductivity ◽

Unsaturated Soils ◽

Flow Model ◽

Unsaturated Flow ◽

Surface Region ◽

Infiltration Rate ◽

Soil Suction ◽

Wetting Front ◽

Near Surface ◽

Unsaturated Hydraulic Conductivity

Transient responses to various infiltration events have been examined using an unsaturated flow model. Numerical simulations reveal a range of infiltration patterns which can be related to the ratio of infiltration rate to unsaturated hydraulic conductivity. A high value of this ratio reflects a prevailing hydraulic conductivity which cannot readily redistribute the newly infiltrated moisture. Moisture accumulates in the near-surface region before advancing down through the soil as a distinct wetting front. In contrast, low values of the ratio of rainfall to unsaturated hydraulic conductivity show minimal moisture accumulation, as the relatively small volumes of infiltrating moisture are readily redistributed through the soil profile.Key words: numerical modelling, infiltration, unsaturated soil, soil suction, groundwater.

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