黄土—三趾马红土滑坡蠕变特性研究

发布时间：2018-04-01 10:15

本文选题：黄土-三趾马红土滑坡　切入点：蠕变模型　出处：《长安大学》2015年硕士论文

【摘要】：黄土-三趾马红土滑坡在黄土高原地区普遍发育,其滑面主要由第四系黄土和新近系三趾马红土复合而成,地下水的长期浸润和雨季的大量降水使得黄土和三趾马红土饱和,强度显著降低,并发生蠕滑,进而形成滑动面,导致边坡失稳破坏。本文在总结相关文献资料的基础上,通过一系列的室内试验,对Q1黄土、三趾马红土的蠕变特性,进行了专门研究。获得的主要成果包括:(1)对饱和重塑Q1黄土、饱和重塑三趾马红土的直剪蠕变试验,得到了相应的蠕变曲线和应力—应变等时曲线,建立了相应的Burgers蠕变模型,并对模型参数进行了分析,提出了统一的Burgers蠕变模型;(2)对比了几种确定长期强度极限值的方法,提出了基于1-曲线的最大曲率点确定长期强度极限值的方法,同时分析了饱和重塑Q1黄土和饱和重塑三趾马红土的强度特性,给出了边坡稳定性分析的强度参数;(3)改进了斋藤公式,并建立了符合长期强度准则的蠕变方程,使之在滑坡的预测预报方面具有实际意义。
[Abstract]:The loess-three-toed red earth landslide is widely developed in the Loess Plateau, and the sliding surface is mainly composed of the Quaternary loess and the Neogene three-toed red soil. The long-term infiltration of groundwater and the heavy precipitation in the rainy season make the loess and the three-toed red soil saturated. The strength is obviously decreased, and creeping surface is formed, which leads to slope instability and failure. Based on the summary of relevant literature and a series of laboratory tests, the creep characteristics of Q1 loess and three-toed red soil are studied in this paper. The main results obtained include the direct shear creep tests of saturated remolded Q1 loess and saturated remolded three-toed red soil. The corresponding creep curves and stress-strain isochronous curves are obtained, and the corresponding Burgers creep model is established. The parameters of the model are analyzed, and a unified Burgers creep model is put forward. Several methods of determining the ultimate value of long-term strength are compared, and the method of determining the limit value of long-term strength based on the maximum curvature point of 1-curve is put forward. At the same time, the strength characteristics of saturated remolded Q1 loess and saturated remolded three-toed red soil are analyzed, the strength parameter of slope stability analysis is given, the Saito formula is improved, and the creep equation that accords with long-term strength criterion is established. It is of practical significance in the prediction and prediction of landslides.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

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