Q_3黄土的三轴蠕变试验研究

Research on the Triaxial Creep Characteristics of Loess of Q_3

采用改进的应力型三轴蠕变仪对Q3黄土进行了三轴剪切蠕变试验,对比分析了围压、干体积质量、含水率的变化对蠕变特性的影响,并通过对试验数据的分析,建立了Q3黄土的经验蠕变模型。试验结果表明:在同等条件下,饱和原状样的蠕变变形量大于重塑土样的蠕变变形量,且两者都大于天然含水状态的原状土样的蠕变变形量。围压越大,蠕变变形量越小;干体积质量越小、含水率越大,蠕变变形量越大。将模型计算出的结果与试验数据进行对比,两者基本吻合,从而验证了该模型的正确性。

The triaxial creep tests of Q3 loess specimens are performed by the improved stress triaxial creepmeter.An analysis is made of the influence of variation of the confining pressure,the dry density,the water content on the creep features.The test results show that the creep deformation of saturated samples is greater than the creep deformation of remodeling samples,and that both of them are greater than the creep deformation of original samples.Under the same conditions,as confining pressure increases,the creep deformation increases;as the dry density decreases,the water content increases,the creep deformation also increases.Compared with the experimental data,the calculated results of model are almost identical with it,and proves the correctness of the model.