原状土与重塑土的动三轴对比试验及研究

On comparative test of dynamic triaxial tests of undisturbed soil and remoulded soil

以甘肃中试厂的地基土为研究对象,采用GCTS STX-100双向振动三轴仪,开展了重塑粘性土样和原状粘性土样相对比的三轴试验,并评价了重塑粘性土及原状粘性土的动力特性,结果表明:原状粘性土和重塑粘性土的动弹性模量随着动应变的增加而减小,但是与围压成正比,同时动应力会随着动应变的增加而增大;最大动剪切模量在围压增大的时候会同时增大,但是当剪应变增大时则会减小;土体扰动减小了土体的动弹性模量和动剪切模量。

Taking the foundation soil of Gansu Pilot Plant as the research object, the paper adopts GCTS STX-100 double-direction vibration triax-ial device to undertake the triaxial test of the remoulded soil sample and the undisturbed soil sample, evaluates the dynamic property of the re-moulded soil and the undisturbed soil, and proves the dynamic elastic modulus of the two soils which reduces along with the increasing dynamic strain, but they increases with added confining pressure, illustrates the dynamic stress increases with more dynamic strains and the maximal dy-namic shearing modulus also increases with the added confining pressure, but it reduces with the increasing shearing strain, and the earthwork in-terruption reduces the dynamic elastic modulus and dynamic shearing modulus.