加筋土动弹性模量的动三轴试验研究

用DDS-70动三轴仪研究了加筋土的动弹性模量，着重研究了动弹性模量随围压、密实度和加筋层数的影响。研究表明：加筋土试样动应力-应变关系曲线符合双曲线模型；加筋土动弹性模量和应变相关曲线与纯粉土的有关曲线相似；加筋土试样的动弹性模量随应力水平的增长而降低；在相同的动应力水平下，随围压、初始干密度的增大而增大。动弹性模量随动应变的增加而减小，其变化呈指数衰减。加筋土的最大动弹性模量与筋体自身性质、围压和土体的密实程度有关。

Study on dynamic elastic modulus of reinforced soil by dynamic triaxial tests

A DDS-70 dynamic triaxial apparatus is used to investigate the elastic modulus of reinforced soil. The influences of confining pressure, compactness and the reinforcing patterns on the elastic modulus are studied. The results show that the relationship of dynamic stress versus dynamic strain of reinforced soil tally with hyperbolic model. The curves of dynamic elastic modulus versus strain for reinforced soil are similar to that of pure soil. For reinforced soil sample the dynamic elastic modulus decreases with strain increasing; at the same dynamic stress level, the dynamic elastic modulus increases with the confining pressure and the initial dry density increasing and decreases with dynamic strain increasing; the relationship between modulus and strain is exponential decay. The maximum dynamic elastic modulus relates with reinforce material, confining pressure, and compactness of the soil.