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Stress relaxation of warm frozen soil under drained or undrained conditions

Research in Cold and Arid Regions 2011年第6期3卷 468-472页

作者： SongHe Wang JiLin Qi State Key Laboratory of Frozen Soil Engineering Cold and Arid Regions Environmental Engineering Research Institute Chinese Academy of Sciences Lanzhou Gansu 730000 China

To investigate the influence of drainage conditions on stress relaxation characteristics of warm frozen soil, a series of laboratory tests were carried out under drained and undrained conditions. The results indicate that confining pressure obviously influences the relaxation process of warm frozen soil. Under undrained condition, with increase in confining pressure, the critical relaxation du- ration tends to grow as well as instantaneous relaxation. But the relaxation rate is sensitive to confining pressure in the initial stage, and with further development, the effect tends to diminish. Under drained condition, the relaxation rate is greater than that under tmdrained condition in the initial stage but with the development of relaxation, the difference decreases. The volumetric defor- mation of warm frozen clay under drained condition is much larger than that under undrained condition.

关键词： warm frozen soil stress relaxation confining pressure drained and undrained conditions volumetric change

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The Use of Airborne LiDAR in Assessing Coastal Erosion in the Southeastern USA

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Journal of Geographical Research 2022年第3期5卷 22-40页

作者： David F.Richards IV Adam MMilewski Brian Gregory Water Resources&Remote Sensing Lab(WRRS) Department of GeologyUniversity of GeorgiaAthensGA 20602USA Southeast Coast Inventory&Monitoring Network(SECN) Main OfficeSoutheast Coast NetworkAthensGA 30605USA

changes in sea level along the coastal southeastern United States(U.S.)influence the dynamic coastal *** particular,the Southeast Coastal Network(SECN)of the National Park Service(NPS)has exhibited evidence of fluctuations in sea level which caused coastal *** LiDAR acquired from NOAA for Fort Matanzas National Monument,Fort Pulaski National Monument,Charles Pinckney National Historic Site,and Cape Lookout National Seashore were analyzed to identify changes in both elevation and the spatial volume of unconsolidated sedimentary material in the coastal southeast over *** that exhibited an increase(deposited material)or decrease(eroded material)in elevation were mapped across the study area from 2006 to *** indicate a quasi-cyclic process where unconsolidated sediment distribution and the morphodynamic equilibrium changes with *** coastal zones are steadily oscillating between the process of erosion and deposition affecting the coastal geomorphological *** use of LiDAR for evaluating coastal sustainability and resiliency due to this environmental phenomenon is clear.

关键词： Coastal Erosion LiDAR Elevation volumetric change Geomorphology Sea level

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