Long-Term Stability of Natural Slopes

天然斜坡的长期稳定性

• 批准号: 8920603
• 负责人: Timothy Stark
• 金额: $ 1.32万
• 依托单位: San Diego State University Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-03-15 至 1991-01-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8920603&HistoricalAwards=false
• 关键词: Long; Term; Stability; Natural; Slopes

The long-term stability of slopes can change due to a progressive reduction in the shear strength parameters. Seasonal cycles of wetting and drying and fluctuations in the water table may contribute to the gradual reduction in the shear strength of natural cohesive soils thus, increasing the probability of landslides. The study will examine the effects of these environmental loadings and the reduction in shear strength of natural claystones, cohesive colluvium and cohesive alluvium, and on the long-term stability of slopes in or affected by these materials. Ring shear tests will be used to measure the accumulation of permanent shear deformation and the subsequent degradation in shear strength. Laboratory data will be applied to documented landslide case histories to validate the research conclusions. The results will be the basis for the development of mitigation measures.

由于抗剪强度参数的逐渐降低，边坡的长期稳定性可能会发生变化。湿润和干燥的季节性循环以及地下水位的波动可能导致天然粘性土的抗剪强度逐渐降低，从而增加滑坡的可能性。这项研究将考察这些环境荷载的影响，以及天然粘土岩石、粘性冲积层和粘性冲积层抗剪强度的降低。以及在这些材料中或受这些材料影响的斜坡的长期稳定性。环形剪切试验将被用来测量永久剪切变形的累积和随后剪切强度的退化。实验室数据将应用于记录在案的山体滑坡案例，以验证研究结论。研究结果将成为制定缓解措施的基础。