含水量对高含冰量冻结砂土屈服面的影响

Previous researches on yield properties of frozen soil rarely consider the change of water content. However，water content often changes in practical engineering. So a series of triaxial compressive tests are con⁃ ducted on ice-rich frozen silty sands at -5. 0 ℃ to investigate systemically the effect of water content on yield properties and then to establish a relationship between deviatoric stress and shear strain with change of water con⁃ tent. The experimental results show that with water content changing，there are obvious changes in the stress-strain curves，which show that water content has different influence on hardening law in different ranges of water content. So the concrete form about yield function should be determined according to ranges of plastic shear strain（hardening parameter）and water content to make the yield function simple and accurate. When plastic shear strain is within 1. 00%，deviatoric stress always increases with water content. However，with water con⁃ tent increasing，deviatoric stress firstly decreases and then increases when plastic shear strain is beyond 1. 00%. And water content of 42. 0% can be regard as a turning point. The yield function and the increment type relation between deviatoric stress and shear strain have been established with change of water content by segmented hard⁃ ening principle. The testing results show that experimental values are basically consistent with simulated values. So they can be used to predict yield-surfaces and deviatoric stress-shear strain curves at different water contents. © 2019 Journal of Glaciology and Geocryology. All rights reserved.

Effect of water content on yield surface of ice-rich frozen silty sand

Previous researches on yield properties of frozen soil rarely consider the change of water content. However,water content often changes in practical engineering. So a series of triaxial compressive tests are conducted on ice-rich frozen silty sands at -5.0℃ to investigate systemically the effect of water content on yield properties and then to establish a relationship between deviatoric stress and shear strain with change of water content. The experimental results show that with water content changing,there are obvious changes in the stressstrain curves,which show that water content has different influence on hardening law in different ranges of water content. So the concrete form about yield function should be determined according to ranges of plastic shear strain(hardening parameter)and water content to make the yield function simple and accurate. When plastic shear strain is within 1.00%,deviatoric stress always increases with water content. However,with water content increasing,deviatoric stress firstly decreases and then increases when plastic shear strain is beyond 1.00%. And water content of 42.0% can be regard as a turning point. The yield function and the increment type relation between deviatoric stress and shear strain have been established with change of water content by segmented hardening principle. The testing results show that experimental values are basically consistent with simulated values. So they can be used to predict yield-surfaces and deviatoric stress-shear strain curves at different water contents.