Dynamic Strength Theory and Energy Analysis of Saturated Saline Frozen Soil Under Uniaxial Impact Loading
In this paper,the effect of salt content and strain rate on the dynamic strength of saturated saline frozen soil under impact loading is investigated by using split Hopkinson compression bar(SHPB).The test results show that when the salt content is between 0%and 2%,the dynamic strength of soil decreases by about 1.5 MPa with each increase in salt content by 1%;it increases by 2.0 MPa for each 250 s-1 increase in strain rate.From an energy perspective,the absorbed energy density of soil during impact decreases by approximately 0.1 J/cm3 with each 1%increase in salt content;The strain rate increases by 0.2 J/cm3 for each 250 s-1 increase in strain rate.Based on the energy balance and fracture theory,a theoretical formula for calculating the dynamic strength of a compression expansion tensile failure model of saturated saline frozen soil is derived.The error between the calculated results and the experimental results is less than 10%,and it can predict the trend of dynamic strength with salt content and strain rate,indicating that this theory can reveal the dynamic failure mechanism of saturated saline frozen soil,and provide theoretical basis and reference significance for engineering practice.
saturated saline frozen soilsplit Hopkinson compression barabsorbing energy densitydynamic strength theory
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