武隆炭质页岩泥化夹层的流变特性及长期强度研究

发布时间：2018-07-03 10:27

本文选题：炭质页岩 + 泥化夹层　；参考：《重庆交通大学》2017年硕士论文

【摘要】：水利工程大坝雍高水位后,库区岸坡受降雨及水位消涨的影响,在江水的长期浸泡下,其岩石性质劣化,可能进入失稳状态。为了预测库区沿岸岩石工程的长期稳定性,有必要对自然状态和饱水状态下岩石流变力学特性进行研究。本文以乌江武隆段炭质页岩泥化夹层为研究对象,基于炭质页岩泥化夹层在自然状态和饱水状态下的力学特性及蠕变规律,采用试验研究与理论分析,建立适用于炭质页岩泥化夹层流变特性的非线性粘弹塑性西原模型,并用逐步迭代的优化反演法进行非线性参数反演,确定流变模型参数并验证模型,最后由流变模型推求长期强度。本文所做主要研究工作如下:(1)分析讨论了几种常见流变模型参数反演方法的优缺点。(2)以武隆炭质页岩泥化夹层为研究对象,进行了岩石含水率试验、直接剪切试验、摩擦试验,得到了相关的力学参数。为炭质页岩泥化夹层剪切流变试验提供依据。(3)采用单试件逐级增量加载试验方式对炭质页岩泥化夹层在自然状态和饱水状态下进行剪切流变试验,分析了两种含水状态下得到的剪切位移-时间曲线,总结了炭质页岩泥化夹层的流变特性。(4)根据炭质页岩泥化夹层有非线性流变阶段,引入非线性粘塑性元件,对西原模型进行了改进,提出了适合炭质页岩泥化夹层流变特性的非线性粘弹塑性西原模型。并用MATLAB和ORIGIN分析软件进行非线性参数反演,确定了流变模型参数,验证了所建模型的恰当性。(5)运用等时应力-应变曲线法和非稳定蠕变判别法两种方法来确定了炭质页岩泥化夹层的长期强度,对比了两种方法的适用条件,最终以等时应力-应变曲线法得到的长期强度拟合出长期抗剪强度参数。
[Abstract]:After the high water level of water conservancy dam, the bank slope of reservoir area is affected by rainfall and water level rising. Under the condition of long-term soaking of river water, its rock property will deteriorate and it may enter into the state of instability. In order to predict the long-term stability of rock engineering along the coast of the reservoir area, it is necessary to study the rheological mechanical properties of rock in natural and saturated state. In this paper, based on the mechanical properties and creep law of carbonaceous shale clay intercalation in natural state and saturated state, the experimental study and theoretical analysis are carried out in Wulong section of Wujiang. A nonlinear viscoelastic-plastic model suitable for rheological characteristics of carbonaceous shale intercalation is established. The parameters of rheological model are determined and the model is verified by the optimization inversion method of step by step iteration. Finally, the long-term strength is derived from the rheological model. The main research work in this paper is as follows: (1) the advantages and disadvantages of several common rheological model parameters inversion methods are analyzed and discussed. (2) the water content test, direct shear test and friction test of rock are carried out in Wulong carbonaceous shale mudding intercalation. The related mechanical parameters are obtained. It provides the basis for shearing rheological test of carbonaceous shale mudding intercalation. (3) the shear rheological test of carbonaceous shale mudded intercalation in natural and saturated state is carried out by means of incremental loading of single specimen. The shear displacement-time curves obtained under two kinds of water-bearing conditions are analyzed, and the rheological characteristics of the carbonaceous shale mudding intercalation are summarized. (4) according to the nonlinear rheological stage of the carbonaceous shale mudding intercalation, a nonlinear viscoplastic element is introduced. A nonlinear viscoelastic-plastic model suitable for rheological characteristics of carbonaceous shale shale-shale intercalation is proposed. The parameters of rheological model are determined by nonlinear parameter inversion using MATLAB and Organ analysis software. (5) two methods, isochronous stress-strain curve method and unsteady creep discriminant method, are used to determine the long-term strength of the carbonaceous shale mudding intercalation, and the applicable conditions of the two methods are compared. Finally, the long term shear strength parameters obtained by isochronous stress-strain curve method are fitted.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV223

【参考文献】