固化土动力特性与三因素动力模型试验

Experimental on Dynamic Characteristics and Three-parameter Dynamic Model of Stabilized Soil

通过动三轴试验研究了Aught-set固化剂掺量、含水率、围压对固化土动力特性的影响。结果表明,固化土的抗动剪切破坏能力和动剪切模量随着围压增加而提高,而随固化剂掺量和含水率的增加呈现出先增后减趋势,最佳配比为固化剂掺量6%和含水率12. 5%。在高速列车循环荷载作用下,固化土的骨干曲线符合Hardin-Drnevich双曲线模型,依据模型参数(初始动剪切模量、最大动剪应力幅值)关于三参数的影响规律,提出了考虑三因素影响下的动参数模型,进而可发展出固化土的三因素动力模型。该研究成果可为高速铁路路基的设计、动力反应分析与灾害预防提供有力的量化依据,也可为公路路基的研究提供有益参考。

The influences of aught-set stabilizer content, water content and confining pressure on the dynamic properties of stabilized soil are investigated by dynamic triaxial tests. Test results show that, the dynamic shear failure resistance and dynamic shear modulus of stabilized soil increase with increasing confining pressure, whereas increase firstly and then decrease with the increase of stabilizer content and water content. The optimum proportion of the soil is achieved at stabilizer content of 6% and water content of 12.5%. Under dynamic train loads, the backbone curves of stabilized soil highly comply with Hardin-Drnevich hyperbolic model. According to the variations of model parameters (initial dynamic shear modulus, maximum amplitude of dynamic shear stress) with the three parameters , a dynamic parameter model is developed accounting for the influences of the three parameters, and then a three-parameter dynamic model is put forward. The research results can provide a powerful quantitative basis for design, dynamic response analysis and disaster protection of high speed railway subgrade, and also provide a useful reference for the research of highway subgrade.