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TEST RESEARCH ON DYNAMIC PROPERTIES OF SATURATED SAND REINFORCED WITH GEOCELLS
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摘要: 以土工格室加筋饱和砂土作为研究对象，研究土工格室加筋饱和砂的动变形模量、阻尼比随加筋层数、格室高度、围压及动应变的变化规律。试验表明：相同工况下动应变随动应力的增大而增大，加筋率的提高对动应变抑制效果最显著；随着动应变的增大，同一工况在不同围压时的动变形模量均随之减小，较高围压时动变形模量也较大；同一工况阻尼比与动应变的变化无相关规律；当围压为50 kPa时，不同工况阻尼比均随动应变增大而减小并在动应变超过某一值后趋于稳定。Abstract: Taking geocell-reinforced saturated sand as research objects, the change laws of dynamic moduli of deformation, damping ratios of geocell-reinforced saturated sand with different reinforcement layers, geocell height, confining pressure and dynamic strain were studied. It was shown that the dynamic strain increased with the increase of dynamic stress in the same working condition, the increase of reinforcement contents could most obviously restrain the increase of dynamic strain. With the dynamic strain increase, the dynamic moduli of deformation decreased in the same working condition subjected to different confining pressure, the dynamic moduli of deformation under high confining pressure was larger. The damping ratios under the same working condition had no obvious rule with the increase of dynamic strain. The damping ratios under different working conditions decreased with the increase of dynamic strain subjected to confining pressure of 50 kPa and it tended to be contant after the dynamic strain exceeded a certain value.
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Key words:
- geocell /
- stress-strain relation /
- dynamic modulus of deformation /
- damping ratio
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