Abstract
Freeze-thaw effects are the main reason that cause damage and instability to engineering structures in cold regions. Laboratory tests for freeze-thaw effects on soil geotechnical properties have made great progress during the past decade. Based on analyzing and summing up current freeze-thaw test methods for soil, the research results in effects of freeze-thaw on the structures, basic physical parameters and mechanical properties of soil and corresponding frost-resistant measures for soil are summarized, the main results shown as followed: (1) an united freeze-thaw test method is the base of analyzing the freeze-thaw effects on soil geotechnical properties and establishing soil database for freeze-thaw properties. (2) Degrees of freeze-thaw effects on soil structure depend on particle size distribution, pore shape and initial moisture content of soil. (3) Freeze-thaw test method and initial state of soil are the main reasons that determine the influence degree of freeze-thaw effects on physical properties of soil, and some physical properties of soil will not be affected by freeze-thaw effects when the corresponding parameters value at a critical state. (4) Strength and modulus of soil decrease with the increasing freeze-thaw cycles at first, and tend to a stable state later. But there are differences in the change rules of freeze-thaw effects on the shear strength parameters because of diversity of test method and initial state of soil. And the phenomenon of temperature threshold during the thawing process of soil should be noted. (5) Methods of mitigating the freeze-thaw effects on soil geotechnical properties should be started by improving the particle size distribution, pore shape, and initial moisture content of soil.
Published Version
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