Author(s): Li Zhijun; Xu Zijun; Wang Qingkai; Li Guoyu
Linked Author(s): Zhijun Li
Keywords: No keywords
Abstract: In order to accumulate the uniaxial compressive strength of thermal growth fresh water ice, we chose the columnar ice from Wuliangsu Lake where is a kind of furiotile lake beside the Yellow River to be the test samples. The samples were loaded in the directions vertical to the ice surface and parallel to the ice surface under different displacement speeds at -2ºC, -5ºC, -7ºC, -10ºC and -15ºC by electronic universal test machine with strict temperature control and displacement speed control. The influence of strain rate, loading direction and temperature on the uniaxial compressive strength were studied. The tests find that the uniaxial compressive strengths vary with the strain rates and temperatures. At a certain temperature, the strength increases to a peak value first, then reduces, and finally tends to smooth with the increase of strain rate and the ice samples include three failure forms: bulging failure, shear failure and splitting failure. In the range of the test temperature, the ice strength decreases with the increase of test temperature. The uniaxial compressive strength can be fitted into a surface with temperature and strain rate. The strength loaded in the direction vertical to the ice surface is larger than that parallel to the ice surface. The peak uniaxial compressive strength loaded in the direction vertical to the ice surface is 2.1 times as large as the strength loaded in the direction parallel to the ice surface. The strain rate at the peak strength increases with ice temperature decreasing, and logarithmic function can be used to express the variation of peak strength with ice temperature.
Year: 2018