原状黄土一维蠕变试验及蠕变模型

中国高速公路银百线陕西境段的控制性工程支党河特大桥经过黄土大沟壑地区,区内存在一大型HP15古滑坡体,从长期角度看可能对桥梁后期稳定性存在威胁,为合理制定防范措施,需要研究黄土的长期蠕变特性.基于该工程面临的实际难题,开展了HP15滑坡体原状黄土在不同应力状态和含水率下的单轴蠕变特性实验,建立了基于Burgers模型的单因素、双因素元件蠕变模型,并通过实验数据曲线拟合的方式建立了考虑时间、含水率和应力状态的3因素经验蠕变模型,扩展了蠕变模型的适用范围,进一步提高了模型对实验黄土蠕变特性的表达,同时也为该黄土边坡的长期损伤防治提供实验基础和理论指导.

Study on one dimensional creep test and creep model of undisturbed loess

Zhidanghe super large bridge, a control project of Yinbai line in Shaanxi Province, passes through the loess gully area, where there is a large HP15 ancient landslide, which may threaten the stability of the bridge in the long term,in order to make reasonable preventive measures, it is necessary to study the long-term creep characteristics of loess.In this paper, based on the practical problems faced by the project, the uniaxial creep tests of intact loess of HP15 landslide under different stress states and water content are carried out,based on Burgers model, single factor and double factor creep models are established,a three factor empirical creep model considering time, moisture content and stress state is established by curve fitting of experimental data,the application scope of the creep model is extended, and the expression of the creep characteristics of the experimental loess is further improved, meanwhile, the experimental basis and theoretical guidance are provided for the long-term damage prevention of the loess slope.