Abstract

Geotechnical heterogeneous materials contain a large number of defects, such as granular structures of different types and spatial geometric distribution, cracks, and voids, and have a complex internal meso-structure. Moreover, the mechanical properties and defect structures of various meso-media have an important influence on the fracture mechanism, which makes the analysis of the fracture process of geotechnical materials a nonequilibrium and nonlinear three-dimensional mechanical problem in space. However, due to the complexity of mathematical theory, the limitation of laboratory test and field observation, test conditions, and technology, it is very difficult to study the three-dimensional fracture process of geotechnical materials, and numerical simulation has become one of the powerful tools to solve these problems. This paper first introduces the concept of digital image and the development of geotechnical engineering, and then analyses the types of engineering materials used in geotechnical engineering construction. A finite element method for mechanical analysis based on digital images is proposed. The method can be used to study the influence of the internal microstructure of geotechnical engineering materials on the mechanical response of materials. By analyzing the images, it can be concluded that the aggregate content is 36.1%, the matrix content is 48.9%, and the rest is the proportion of interface elements. The digital image numerical analysis method in this paper is based on two-dimensional space, but according to the principle of stereological logic transformation, it can be applied to three-dimensional finite element analysis.

摘要

岩土异质材料含有大量缺陷，如不同类型和空间几何分布的粒状结构、裂缝、空隙等，具有复杂的内部细观结构。此外，各种细观介质的力学性能和缺陷结构对断裂机理有重要影响，使岩土材料断裂过程的分析成为空间非平衡非线性三维力学问题。但由于数学理论的复杂性、室内试验和现场观察、试验条件、技术等方面的限制，研究岩土材料三维断裂过程非常困难，数值模拟已成为强有力的研究手段之一。解决这些问题的工具。本文首先介绍了数字图像的概念和岩土工程的发展，然后分析了岩土工程建设中使用的工程材料的种类。提出了一种基于数字图像的力学分析有限元方法。该方法可用于研究岩土工程材料内部微观结构对材料力学响应的影响。通过图像分析可以得出，骨料含量为36.1%，基体含量为48.9%，其余为界面元素的比例。本文的数字图像数值分析方法是基于二维空间的，但根据立体逻辑变换的原理，可以应用于三维有限元分析。