【摘要】 保持大主应力、中主应力不变，增大小主应力是实际工程中可能存在的一种应力路径，土石坝蓄水和土方回填等就类似这种加荷方式。就该应力路径对宁波淤泥土进行了真三轴试验，针对真三轴试验结果，对弹塑性本构关系中涉及到的应力矢量增量与应变矢量增量的方向变化规律进行了特定条件下的研究。结果表明，在这种应力路径下排水剪切，应变矢量增量与应力矢量增量的方向不仅不一致，而且与π平面上相应的径向应力路径的偏角也不一致，这种应力路径下的现象和结果是岩上塑性力学和计算上力学中极少考虑的。更多还原

【Abstract】 Keeping both major and medium principal stresses unvaried and increasing minor principal stress are a potential stress path in practical projects such as the impounding of earth and stone dam and the backfilling of earthwork. Several groups of true triaxial tests on silt soils from Ningbo, Zhejiang are studied. The testing results indicate that the direction of stain vector not only disaccords with that of stress increment but also with that of radial stress path. These phenomena and results under the present stress path have been seldom considered in rock and soil plastic mechanics and computational soil mechanics.更多还原