【摘要】 对一砂质泥岩风化土在300,400,500 k Pa及600 k Pa固结围压下,分别进行了原状土样与重塑土样的动三轴试验,得到了该砂质泥岩风化土的阻尼比曲线。试验结果表明,原状土与重塑土在各固结围压试验下,阻尼比随归一化剪应变γ取值的增大而增大,且在γ取值相同时,原状土阻尼比值大于相应重塑土;原状土与重塑土试样的λd~γ关系曲线均随固结围压的升高而逐渐降低,且降低幅度随着γ值的增大而减小,并在γ值接近于1时各关系曲线基本交叉重合;在同等试验条件下,通过经验公式与绘图两种方式求得的最大阻尼比值相差很小,但随着固结围压的增大,两种方式求得的最大阻尼比值相差变大。更多还原

【Abstract】 This paper focuses on the dynamic traxial test of remodeled and undisturbed sandy mudstone saprolite samples under confining pressures of 300 k Pa,400 k Pa,500 k Pa and 600 k Pa,and the damping ratio curves of the saprolite samples were obtained. The results show that the damping ratio of all saprolite samples will increase with the increment of normalized shear strainγ under different confining pressure; furthermore,for the same γ value,the damping ratio of the undisturbed saprolite is higher;the λd- γ curve of all saprolites goes downward with the increment of confining pressure and the reducing amplitude declines with the increment of value γ,when the γ value gets close to 1. 0,all the curves intersect and coincide; under the same test conditions,the maximum damping ratios obtained by empirical formula and drawing are close,however,with the increment of confining pressure,the difference of the maximum damping ratio calculated by the two ways becomes larger.更多还原