Experimental study on shear characteristics of soil and concrete/soil interface in thawing and freezing state [融化和冻结状态下土及混凝土/土界面剪切特性试验研究]

作者：Huang X.; Zhou H.; Di S.; Sheng Y.^*; Peng E.; Zhang X.; Cao W.

来源：Journal of Central South University(Science and Technology), 2021, 52(11): 4137-4147.

DOI：10.11817/j.issn.1672-7207.2021.11.033

• Concrete/soil interface
• Direct shear tests
• Shear strength
• Thawing and freezing state

To study the shear behavior of the soil/soil and structure/soil in thawing and freezing state, the method of direct shear test was adopted, and a series of tests were conducted on soil at various temperatures, and on concrete/soil interface at various temperatures and water contents. Based on the test results, the failure mechanism of the pile-soil interface with the uplift load was analyzed, and the values of the tangential frost heave stress in different codes were discussed. The results show that a hardening behavior is observed during shearing of soil and concrete/soil interface in the thawing state, while there exists a softening behavior in the freezing state. The shear strength of soil is greater than that of the concrete/soil interface whether in thawing or freezing state. The cohesion of the concrete/soil interface increases with the increase of water content, while the internal friction angle decreases with the increase of water content in thawing state. In freezing state, the cohesion of the concrete/soil interface increases by 33.26-129.28 kPa for every 1 ℃ decrease in temperature (the moisture content increases from 15% to 35%), and increases by 7.61-25.90 kPa (the temperature decreases from -1 ℃ to -5 ℃) for every 1% increase in water content.

• 单位
  冻土工程国家重点实验室; 中国科学院大学