Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Swelling pressure of compacted expansive soil over a wide suction range
Abstract A series of wetting experiments was performed on a compacted expansive clay to evaluate the swelling pressure generated over a wide suction range. Both osmotic and vapor equilibrium techniques were introduced and implemented to apply the suction required in the swelling pressure measurements. It is shown that, associated with the evolution of the microstructure of soil during wetting, the development of swelling pressure with decreasing suction is nonmonotonic. The soil water retention characteristics were independent of dry density at high suction in the adsorption regime, and a threshold suction was identified to distinguish adsorbed and capillary waters. The development of swelling pressure was closely related to the water retention characteristics. At high suction, the swelling pressure stems mainly from interlayer hydration; at low suction, however, the swelling pressure was controlled by the development of double layers, accompanied by the collapse of some macropores. The nuclear magnetic resonance (NMR) technique was introduced to determine the specific amount of adsorbed and capillary water contents, shedding new insights into the swelling behavior of compacted expansive soil during the wetting process under confined conditions.
Highlights Swelling pressure is controlled by interlayer hydration and macropore collapse. Adsorbed and capillary water contents are determined over a wide suction range. Evolution of swelling pressure is related to pore water redistribution.
Swelling pressure of compacted expansive soil over a wide suction range
Abstract A series of wetting experiments was performed on a compacted expansive clay to evaluate the swelling pressure generated over a wide suction range. Both osmotic and vapor equilibrium techniques were introduced and implemented to apply the suction required in the swelling pressure measurements. It is shown that, associated with the evolution of the microstructure of soil during wetting, the development of swelling pressure with decreasing suction is nonmonotonic. The soil water retention characteristics were independent of dry density at high suction in the adsorption regime, and a threshold suction was identified to distinguish adsorbed and capillary waters. The development of swelling pressure was closely related to the water retention characteristics. At high suction, the swelling pressure stems mainly from interlayer hydration; at low suction, however, the swelling pressure was controlled by the development of double layers, accompanied by the collapse of some macropores. The nuclear magnetic resonance (NMR) technique was introduced to determine the specific amount of adsorbed and capillary water contents, shedding new insights into the swelling behavior of compacted expansive soil during the wetting process under confined conditions.
Highlights Swelling pressure is controlled by interlayer hydration and macropore collapse. Adsorbed and capillary water contents are determined over a wide suction range. Evolution of swelling pressure is related to pore water redistribution.
Swelling pressure of compacted expansive soil over a wide suction range
Liang, Wei-yun (Autor:in) / Yan, Rong-tao (Autor:in) / Xu, Yong-fu (Autor:in) / Zhang, Qin (Autor:in) / Tian, Hui-hui (Autor:in) / Wei, Chang-fu (Autor:in)
Applied Clay Science ; 203
01.02.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Hydromechanical behaviour of a compacted swelling soil over a wide suction range
| Online Contents | 2005
Hydromechanical behaviour of a compacted swelling soil over a wide suction range
| British Library Online Contents | 2005
Swelling Behavior of Compacted Expansive Soils
| British Library Conference Proceedings | 2009
Swelling Behavior of Compacted Expansive Soils
| ASCE | 2009