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中文摘要：
采用研制的卧式三轴拉压试验仪对糯扎渡和双江口心墙堆石坝心墙土料进行了常规三轴压缩试验、三轴拉伸（伸长）试验和三轴压缩–拉伸组合试验。根据试验结果,研究了压实黏土在三轴压缩、拉伸以及从压缩到反向拉伸状态下的应力应变特性。在此基础上,对邓肯张EB模型的应用范围进行了扩展,扩展后的模型可描述压实黏土从压缩到反向拉伸过程的变形特性,可用于进行土体张拉裂缝扩展问题的模拟计算。
英文摘要：
The conventional triaxial tests,triaxial tension（extension） tests and combined compression-tension triaxial tests on core clay materials of Nuozhadu and Shuangjiangkou earth-rockfill dams are carried out by using the developed horizontal triaxial tension-compression apparatus.Based on the test results,the stress-strain behaviors of compacted clay under triaxial compression,triaxial tension and compression-to-tension states are investigated.Furthermore,the applicability of Duncan-Chang’s EB constitutive model is extended,so that it can be used to describe the deformation properties of compacted clay from compression state to tension one.This extended Duncan-Chang model can be used for numerical simulation of tensile crack propagation in soil structure.
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