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首页> 外文会议>International conference on cold regions engineering >Development of Bearing Capacity of Fine Grained Permafrost Deposits in Western Greenland Urban Areas Subject to Soil Temperature Changes
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Development of Bearing Capacity of Fine Grained Permafrost Deposits in Western Greenland Urban Areas Subject to Soil Temperature Changes

机译：西部格陵兰市区土壤温度变化对细粒多年冻土沉积物承载力的影响

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The bearing capacity of frozen soils is high, compared to non-frozen soils of same composition. Projected climatic warming in the Arctic will increase the soil temperature, thus affecting the bearing capacity and the deformation properties. Western Greenland temperatures are projected to increase by 2-3 °C during the 21st century. This paper presents a relation between undrained shear strength and temperature based on a series triaxial tests of fine-grained permafrost in the interval from -3 °C to -1 °C. Moderately ice-rich permafrost and excess ice free refrozen active-layer were retrieved from the Western Greenland towns of Sisimiut and Ilulissat respectively. Tests reveal undrained shear strengths ranging from 409 kPa to 940 kPa, where low temperatures and low excess ice content yield higher strengths. Normalized strengths are used for establishing a trend for the strength decrease with increasing temperature. Both excess ice free and moderately ice-rich samples show a strength decrease of 21 %/°C from -3 °C to -1 °C. Other authors' data suggest the same trend for moderately ice-rich samples, whereas it is suggested that further studies are conducted to validate the trend for excess ice free samples. Unfrozen water contents are seen to be directly inversely proportional to the undrained shear strength when both are normalized, which may reduce costs for establishing reliable soil strength parameters. It is suggested that a relation to deformation parameters are investigated as well. The established trends could provide a valuable tool for foundation design in fine-grained permafrost areas.
机译：与相同成分的非冻土相比，冻土的承载力较高。预计的北极气候变暖将增加土壤温度，从而影响承载能力和变形特性。预计21世纪格陵兰西部的温度将上升2-3°C。本文基于在-3°C至-1°C区间内的细粒多年冻土的三轴系列试验，提出了不排水的剪切强度与温度之间的关系。从西格陵兰的西西缪特镇和伊卢利萨特分别回收了适度富冰的永久冻土和多余的无冰冻冷冻活性层。测试显示不排水的剪切强度范围为409 kPa至940 kPa，其中低温和低过剩冰含量可产生更高的强度。归一化强度用于建立强度随温度升高而降低的趋势。从-3°C到-1°C，过量的无冰样品和中度富冰样品均显示出强度降低21％/°C。其他作者的数据表明中度富冰样品的趋势相同，但建议进行进一步的研究以验证过量无冰样品的趋势。当将两者均进行归一化时，未冻结的水分含量与不排水的剪切强度成反比，这可以降低建立可靠的土壤强度参数的成本。建议也研究与变形参数的关系。既定的趋势可以为细颗粒多年冻土地区的基础设计提供有价值的工具。

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