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中文摘要：
针对取自黄河三角洲地区的原状饱和海洋软黏土，进行了一系列非均等固结条件下的应力控制式双向耦合循环剪切试验，着重探讨了初始大主应力方向角α0、循环剪切荷载分量比R以及循环应力水平（用循环应力比皿来表示）对饱和海洋黏土残余变形特性的影响。试验结果表明，α0对循环剪切过程中产生的残余轴向应变禾破坏时的岛以及残余轴向应变比晶ετ/εmax与循环次数比N／Nf之间的关系具有显著影响。随着尺值减小，循环剪切过程中产生的品逐渐减小，且破坏时的ετ亦逐渐减小。对应相同N／Nf，随着R值减小，ετ/εmax值先增大后减小。试验数据经归一化处理后，不同R值对应的岛ετ/εmax-N/Nf关系曲线集中于一个狭窄的条带内，可用统一的表达式来表示。α0=0°与90°时，不同R值对应的残余剪应变γτ-循环次数Ⅳ关系曲线差异性并不十分明显，而α0=30°与60°时，R对γτ-N关系影响显著。低应力与高应力水平循环荷载作用下ετ与γr随Ⅳ的增加变化规律差异性明显，分别建议了相应的ετ/εmax-N/Nf关系表达式。
英文摘要：
Through a series of stress-controlled bi-directional cyclic shear tests under different three-dimensional anisotropic consolidation stress conditions on the undisturbed saturated marine soft clay from the yellow river delta area, the effects of the initial orientation angle of the maximum principal stress α0, the ratio of the two stress components R and the cyclic stress level （expressed by cyclic stress ratio Re） on the characteristics of residual deformation of the saturated marine clay are examined. The test results show that the α0 has remarkable effect on the residual axial strain er caused by cyclic loading, εr at failure and the relation between ratio of residual axial strain ετ/εmax and ratio of number of cycles N/Nf. Both εr caused by cyclic loading and εr at failure decrease with a decrease of R. At the same N/Nf, ετ/εmax increases at first then decreases with a decrease of R. The relation curves of ετ/εmax -N/Nf with different R concentrate in a narrow strip and can be expressed by a unified expression by normalizing the test data. At α0 =0° and 90°, the differences of relation curves between residual shear strain γr and cycle number N with different values of R are not remarkable. While at or0 =30° and 60°, the R has significant influence on the relation curves between γr andN. The differences of the variation regularities of ετand γr under low stress level and high stress level with an increase of N are obvious. The relational expressions between ετ/εmax and N/Nf are proposed.
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