土石混合体渗透侵蚀特性数值模拟研究

发布时间：2018-05-07 07:45

本文选题：土石混合体 + 渗流侵蚀　；参考：《岩土力学》2017年05期

【摘要】：土石混合体是由块石、砾石与砂土、黏土等固体颗粒组成,以块石镶嵌在细粒土体中为结构特征的松散介质。由于其颗粒松散特性,细颗粒在渗流作用下易于流失而形成渗流侵蚀。采用室内试验与数值模拟相结合的方法,扩展渗流侵蚀模型在土石混合体渗透侵蚀研究中的应用。选取云南某滑坡土石混合体为研究对象,采用自制的渗透侵蚀装置,模拟土体基质渗透侵蚀过程,获取土体基质侵蚀参数试验值。根据块石在土体基质中分布特征,建立不同块石含量特征的土石混合体计算模型。基于参数试验值及渗流侵蚀方程、耦合渗流控制方程及孔隙率控制方程,模拟土石混合体渗流侵蚀过程,分析块石含量对土石混合体渗透侵蚀特性的影响。模拟结果表明:在同等水力梯度及时间条件下,块石含量与土石混合体宏观平均流速初值、侵蚀颗粒密度值呈反比,与液化颗粒密度峰值呈正比;块石含量与渗流侵蚀方程中试验参数存在线性相关性。将块石含量作为土石混合体结构特征引入渗流侵蚀方程中,以构建适用于土石混合体的渗流侵蚀模型。
[Abstract]:The soil-rock mixture is a loose medium which is composed of solid particles such as block gravel sand clay and so on. Due to its loose properties, fine particles are easy to be lost under seepage and form seepage erosion. The application of extended seepage erosion model in soil and rock mixture is studied by using the method of laboratory test and numerical simulation. A mixture of landslide, soil and rock in Yunnan Province was selected as the research object. The soil matrix erosion parameters were obtained by using a self-made infiltration erosion device to simulate the process of soil matrix infiltration erosion. According to the characteristics of rock mass distribution in soil matrix, a calculation model of mixed rock with different mass content was established. Based on the experimental data, seepage erosion equation, coupled seepage control equation and porosity control equation, the seepage erosion process of soil-rock mixture is simulated, and the influence of rock mass content on seepage erosion characteristics of soil-rock mixture is analyzed. The simulation results show that under the same hydraulic gradient and time, the mass content is inversely proportional to the initial value of macroscopic average velocity of the soil-rock mixture, and the density of the erosion particles is inversely proportional to the peak value of the liquefaction particle density. There is a linear correlation between the rock mass content and the experimental parameters in the seepage erosion equation. The mass stone content is introduced into the seepage erosion equation as the structural characteristics of the soil-rock mixture, and a seepage erosion model suitable for the soil-rock mixture is constructed.
【作者单位】：上海交通大学船舶海洋与建筑工程学院;九江学院土木与城建学院;
【基金】：国家自然科学基金资助项目(No.51479112,No.50979055) supported by the National Natural Science Foundation of China(51479112,50979055)
【分类号】：TU43

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