黄土湿化特性的三轴试验研究

研究目的：本文旨在通过三轴试验，研究黄土湿化应力应变关系、强度特征及影响因素。 研究方法：通过等围压固结湿化试验和三轴剪切湿化试验进行研究。 研究结果：获得不同围压条件下固结湿化变形随时间变化规律，初始含水量、压实度的影响规律；获得不同应力水平下湿化应力应变关系、剪切湿化变形规律以及湿化对强度的影响等成果。 研究结论：（1）湿化变形受初始含水量及压实度的影响很大；（2）湿化条件与不浸水条件下，应力一应变关系均表现为应变硬化特性；（3）剪切湿化体积变形随应力水平的增加而减小，轴向变形随应力水平的增大而增大；在同一应力水平下，体积变形与轴向变形均随平均主应力的增大而减小；（4）湿化不仅降低了黄土的强度，也降低了黄土达到破坏时的应变。

The Triaxial Test Study of Loess Wetting Properties

Research purposes: By using triaxial test,this paper researches the tress-train relationship,strength property of loess due to wetting,strength characteristics and influence factors.Research methods:Based on the tests under isotropic consolidation and triaxial shear,the wetting properties of loess are obtained.Research results:The strain-time relationship,the influences of initial moisture content and dry density under isotropic consolidation are obtained.The tress-train relationship varying with tress level,the properties of train,strength property of wetting loess under triaxial shear are obtained.Research conclusions:(1) The tremendous influence on humidification deformation by initial moisture content and compaction degree;(2)The stress-strain relationship should behave as strain hardening characteristics under the conditions of humidification and non-soaking;(3)The shearing humidification volumetric deformation decreases with the increasing of stress level while the axial deformation increases with the increasing of stress level;Under the same stress level,both the volumetric deformation and axial deformation decrease with the increasing of average main tress;(4)The humidification decreases not only the strength of loess but also the strain of loess when achieving failure.