应变控制下压实黄土的动三轴试验研究

Study on compacted loess under strain control at dynamic triaxial test

在动应变控制条件下,对压实黄土进行了应力松弛特性研究,得出应力松弛随湿度、围压、激振频率和初始应变变化的关系。对压实黄土在动应变控制方式下的振陷进行了研究,结果表明:压实黄土的振陷时间很短,振陷量随围压、频率的增加而减小,随着湿度的增加而增加。在试验及理论推导基础上,提出了压实黄土在动应变控制下的动力流变试验模型。研究结论对实际工程中处理压实黄土的振陷,有一定的理论指导意义。

Under dynamic strain control, the stress relaxation characteristics and vibration settlement of compacted loess are studied. The tests give the variation amplitude of stress relaxation according to humidity content, confining pressure, frequency and initial strain. The time of vibration settlement is very short. Vibration settlement decreases with the increasing of confining pressure and frequency, but increases with increase of humidity content. The conclusion has important theoretical significance to projects. Finally, a dynamic rheological test model is put forward based on the tests and theoretical derivation.