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中文摘要：
为了研究应力路径对吹填土结构性特征的影响,利用WF应力路径三轴仪对天津滨海新区吹填土进行常规三轴固结不排水试验及K0固结下的增P、等P、减P应力路径试验,同时进行扫描电镜试验。试验结果分析表明,出现结构屈服的应变量在2%左右;减P、等P、增P应力路径下土体结构屈服应力逐渐增大,并且结构屈服应力随着围压的增大而增大,随着累积变形量的增加则保持一定值。微观结构测试分析表明,吹填土体微观结构变化规律受应力路径和累积变形量影响较为明显,土体结构屈服前后,土体微观结构有着明显的差异。
英文摘要：
Using the WF Automatic Triaxial System,conventional triaxial tests under consolidated undrained condition have been carried out on the dredger fill of Tianjin Binhai New Area. And the tests of different stress paths under K0 consolidation condition were carried out. Scanning electron microscopy（ SEM） tests also have been carried out. The test results showed that the structure yield when the strain exceed 2%.The structural yielding stress of INP is bigger than KCP,and DEP is the smallest. The yielding stress is increasing with the confining pressure,but maintain a certain value with the increase of cumulative deformation. Analysis of microstructure test showed that the effect of stress paths and damage degree on the microstructure of dredger fill is significant. The soil microstructure is quite different before and after the yield of soil structure.
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