Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Temperature and Freeze-Thaw Effects on Dynamic Properties of Fine-Grained Soils
AbstractConsider that the Mable Creek silt in central Alaska liquefied during the November 2002 earthquake. Subsequently, frozen samples of these fine-grained soils were retrieved for laboratory study. This paper presents the influence on dynamic properties by temperature changes from below freezing to near freezing, and by freeze-thaw cycles. Sample temperature change was simulated by gradually applying the increasing temperatures of –0.2, 0.5, 1, 5, and 24°C. Sample seasonal climate change was simulated by applying 1, 2, and 4 freeze-thaw cycles. Tests on specimens conditioned at 0.5 and –0.2°C through different thermal conditioning paths were also performed. Determination of the soil’s dynamic properties was investigated using triaxial strain-controlled cyclic tests. The shear modulus was found to decrease when the temperature increased from near freezing to above freezing; however, the damping ratio reached a maximum value when temperature was at or near freezing. Applying 1, 2, and 4 freeze-thaw cycles resulted in an increase in both the dynamic shear modulus and the damping ratio. Thermal conditioning paths with the same target near-freezing temperature were found to impact dynamic properties.
Temperature and Freeze-Thaw Effects on Dynamic Properties of Fine-Grained Soils
AbstractConsider that the Mable Creek silt in central Alaska liquefied during the November 2002 earthquake. Subsequently, frozen samples of these fine-grained soils were retrieved for laboratory study. This paper presents the influence on dynamic properties by temperature changes from below freezing to near freezing, and by freeze-thaw cycles. Sample temperature change was simulated by gradually applying the increasing temperatures of –0.2, 0.5, 1, 5, and 24°C. Sample seasonal climate change was simulated by applying 1, 2, and 4 freeze-thaw cycles. Tests on specimens conditioned at 0.5 and –0.2°C through different thermal conditioning paths were also performed. Determination of the soil’s dynamic properties was investigated using triaxial strain-controlled cyclic tests. The shear modulus was found to decrease when the temperature increased from near freezing to above freezing; however, the damping ratio reached a maximum value when temperature was at or near freezing. Applying 1, 2, and 4 freeze-thaw cycles resulted in an increase in both the dynamic shear modulus and the damping ratio. Thermal conditioning paths with the same target near-freezing temperature were found to impact dynamic properties.
Temperature and Freeze-Thaw Effects on Dynamic Properties of Fine-Grained Soils
Hulsey, J. Leroy (Autor:in) / Zhang, Yu
2015
Aufsatz (Zeitschrift)
Englisch
Temperature and Freeze-Thaw Effects on Dynamic Properties of Fine-Grained Soils
| British Library Online Contents | 2015