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针对饱和重塑黄土进行了一系列等向固结和偏压固结下的排水与不排水动三轴试验,分析了饱和重塑黄土的动力性质、骨干曲线模型及其影响因素。基于动三轴试验结果,探讨了在考虑累积塑性应变影响下,修正Hardin-Drnevich模型的适用性。结果表明,考虑累积塑性应变时,修正Hardin-Drnevich模型能够较好地模拟饱和重塑黄土的骨干曲线试验结果。进而分析了等向固结和偏压固结、固结围压、波形和排水条件等因素对饱和重塑黄土骨干曲线的影响,得到偏压固结和固结围压的增大使骨干曲线上移,土体强度增加,而波形对骨干曲线的影响较小;排水条件下的骨干曲线较不排水条件下的有所上移,土体强度增加。所得结论可供工程设计人员参考。
A series of triaxial tests of drained and undrained solidified remolded loess under constant consolidation and bias consolidation were carried out. The dynamic properties of the saturated remolded loess, the backbone curve model and its influencing factors were analyzed. Based on the moving triaxial test results, the applicability of the modified Hardin-Drnevich model under the influence of cumulative plastic strain is discussed. The results show that the revised Hardin-Drnevich model can well simulate the experimental results of the backbone curve of saturated remolded loess when cumulative plastic strain is considered. Furthermore, the effects of isotropic consolidation and bias consolidation, consolidation confining pressure, wave form and drainage conditions on the backbone curve of saturated remolded loess were analyzed. The results of bias consolidation and consolidation confining pressure increase The strength of the soil increased, but the waveform had little effect on the curve of the trunk; the curve of the trunk under the condition of drainage increased slightly compared with that under the condition of no drainage, and the soil strength increased. The conclusions can be referenced by engineering designers.