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本文通过动三轴进行饱和砂的液化试验,考察三种砂的剪切模量和阻尼比随孔隙水压力变化的规律。由试验可知:①饱和砂的剪切模量与阻尼比随孔隙水压力的增加而降低;②在一般情况下,剪切模量、阻尼比与孔隙水压力及剪应变幅之间的关系可分别表示为可分离变量的函数:G(u,γ)=f(u)·Gm(γ)及λ(u,γ)=g(u)·λ_m(γ),对试验所用的三种砂已给出表达式;③在接近液化时,橡皮膜对试验结果有较大的影响,应进行修正。
In this paper, dynamic triaxial tests of saturated sands are conducted to investigate the variation of shear modulus and damping ratio of three kinds of sands with pore water pressure. From the test, it can be known that: 1 The shear modulus and damping ratio of saturated sand decrease with the increase of pore water pressure; 2 Under normal circumstances, the relationship between shear modulus, damping ratio and pore water pressure and shear strain amplitude can be Respectively expressed as a function of separable variables: G(u, γ) = f(u) · Gm(γ) and λ(u, γ) = g(u) · λ_m(γ), the three types of sand used for the test The expression has been given; 3 When the liquefaction is approached, the rubber film has a great influence on the test result and should be corrected.