SPTC Project 15.1-17
Tangential Heave Stress Acting on Deep Foundations in Cold Regions
Abstract
In this study, the research team performed an experimental investigation of the effect of frost heave during soil freezing on the development of tangential heave force acting on deep foundations. A novel, laboratory-scale tangential heave testing system, instrumented with a model pile,moisture sensors and thermocouples, was developed in this study. The model pile was specially manufactured by bonding two vertically-cut half piles into a single, closed ended pipe pile and instrumented with strain gages and thermocouples on inner surface of the pile.The test soil was subjected to a temperature gradient of 0.082°C/mm between the top(-10 °C)and bottom (15 °C) of the soil sample in an environmental chamber. The maximum heave amounts at the center and corner of the soil surface were about 18mm and 14 mm, respectively. The pile top reached a peak upward movement of 0.533 mm at 24 hours, and no significant change was observed thereafter. The tangential heave stress measured in this study varied from about 66 kPa to 280 kPa. The tangential heave tests using the instrumented model pile and image acquisition system provided a wealth of information that can improve fundamental understanding of ice-soil-pile interaction.Furthermore, the testing system and procedure developed in this study may contribute to establish a test standard for tangential heave testing.
Project PI: Hoyoung Seo
Researchers:
Project Duration: 2016-2019
Center for Multidisciplinary Research in Transportation (TechMRT)
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Address
Texas Tech University, Box 41023, Lubbock, TX 79409-1023 -
Phone
806.742.3523 -
Email
techmrt.outreach@ttu.edu