Abstract
Tensile strength of frozen soil is an important index for frozen soil engineering design. It is found that uniaxial tensile strength, three-point bending and four-point bending tensile strength values of frozen soil are inconsistent in the test. For this reason, the meso-level numerical method is adopted, assuming that the meso-level material parameters conform to Weibull distribution, and the damage model is adopted, and the macro-level material properties conform to linear elasticity assumption. Uniaxial tensile test, three-point bending tensile test and four-point bending tensile test are respectively simulated. The results show that the difference comes from the non-uniformity of materials. The results of this paper provide effective guidance for frozen soil strength design.
Highlights
Referring to "Influence of Loading Rate and Mode on Bending Strength of Artificial Frozen Soil", in the process of artificial freezing, natural rock and soil changes into artificial frozen soil, and its physical and mechanical properties will change significantly
The test found that the bending tensile strength and direct tensile strength of frozen soil are different[1], mainly due to the following factors: (1) Test error; (2) Tensile modulus and compressive modulus are different; (3) Test the surface effect of the sample, that is, the material is layered and the surface layer covers the material with higher strength; (4) non-uniformity of materials; (5) non-linear change of stress-strain; Firstly, this paper introduces the principle and calculation process of RFPA in mesoscopic mechanics system
Comparison of flexural properties of specimens under two loading modes The loading rate under four-point loading mode has no effect on flexural strength and the maximum relative deflection in mid-span when specimens are damaged, while the flexural strength and the maximum relative deflection in mid-span when specimens are damaged under three-point loading mode both increase linearly with the loading rate
Summary
Referring to "Influence of Loading Rate and Mode on Bending Strength of Artificial Frozen Soil", in the process of artificial freezing, natural rock and soil changes into artificial frozen soil, and its physical and mechanical properties will change significantly. Thermophysical and mechanical testing of artificial frozen soil is the premise and necessary condition for reasonable design and safe construction in the design process of artificial freezing method. At present, there are many methods to test the tensile strength of frozen soil: direct stretching, Brazilian disc stretching, four-point bending and three-point bending. The difference of results of different test intensities is analyzed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
