石灰土填料在动载作用下弹性模量的试验研究

EXPERIMENTAL STUDY ON ELASTIC MODULUS OF LIME SOIL UNDER DYNAMIC LOADING

在大量动三轴试验的基础上，研究了石灰土试样的动弹模量的变化规律；同时还针对掺灰比、固结比以及频率等影响因素进行了深入研究，得出了下列的结论：石灰土的动弹模量随应变水平的变化规律与粘土基本一致；在相同应变水平下，随着围压的增大动弹模量将增大：增大掺灰比，动弹模量亦相应增加；当掺灰比大于5％时，效果尤其明显：固结比对动弹模量有很大影响，最大动弹模量随固结比增减而增减，动应变幅值较小时，动弹模量随固结比增减而增减，但超过某一应变幅值时，将随固结比增加而减少；在相同的振动荷载作用下，频率愈高，动弹模量愈大，但增长的幅度并不是很大。所得出的结论对工程应用具有一定的指导意义。

Based on a lot of dynamic triaxial tests, the variation laws of dynamic elastic modulus of lime soil sample were studied. Meanwhile, the influences of lime dosage ratio, consolidation ratio, and frequency on elastic modulus were investigated. It is concluded that the relationship between elastic modulus and dynamic strain of lime soil is similar to that of natural soil. The elastic modulus increases as the confining pressure increases at the same level. With dosage ratio increasing, the elastic modulus also increases, and when it exceeds 5%, the elastic modulus increases evidently. The influence of consolidation ratio on modulus is significant. At a lower strain, the modulus increases with the consolidation of ratio increasing. When strain exceeds a certain value, the modulus decreases with consolidation ratio increasing. The higher the frequency is, the larger the modulus is. But the influence of frequency on modulus is not as evident as above factors. It is verified that the way to adopt the soft soil of unfavourable mechanical properties by adding lime as road fillings is economical and practicable. The achieved conclusions can provide a useful guidance for the preliminary estimation of lime requirements to improve the dynamic properties of clays.