Abstract
The regularity of dynamic change of real mesostructures of soil is the foundation of the macro- and mesointegrated research. Mesoscale research about continuous image acquisition in real soils, identifying and quantifying mesostructures, is the subject of current interest. Soil mesostructure measurement method is the basis of modeling, and the development of rapid, direct, and lower-cost methods has great practical value for engineering practice. Combined with conventional triaxial loading test equipment, optical measurement, mesoscopic imaging tracking system, and digital image technology, a new method for measuring the dynamic change of the soil mesostructure is designed. This integrated approach to observation and acquisition is realized by direct observation and continuous image capture for dynamic change of real mesostructures of soil. The methods are used to analyze the high compressibility of a certain clay, shear zone development of cement soil, and erosive effects of ecological soil in order to investigate the continuous variation of mesostructures during the shear test. The aim of this paper is to provide a simple, straightforward, continuous, and low-cost test method for revealing the characteristics of consecutive change of real mesostructures of soil in the conventional triaxial test.
Highlights
Academic Editor: Lei Hou e regularity of dynamic change of real mesostructures of soil is the foundation of the macro- and mesointegrated research
Combined with conventional triaxial loading test equipment, optical measurement, mesoscopic imaging tracking system, and digital image technology, a new method for measuring the dynamic change of the soil mesostructure is designed. is integrated approach to observation and acquisition is realized by direct observation and continuous image capture for dynamic change of real mesostructures of soil. e methods are used to analyze the high compressibility of a certain clay, shear zone development of cement soil, and erosive effects of ecological soil in order to investigate the continuous variation of mesostructures during the shear test. e aim of this paper is to provide a simple, straightforward, continuous, and low-cost test method for revealing the characteristics of consecutive change of real mesostructures of soil in the conventional triaxial test
According to the Chinese National Standard “standard for engineering classification of the soil” [44] (Chinese 2007) and the Chinese National Standard “Test Methods of Soils for Highway Engineering” [45], it is low liquid limit clay and not expansive soil. e reason for its high compressibility cannot be explained from the macroscopic characterization
Summary
Dynamic change of real mesostructures of soils is the embodiment of macroscopic property For this reason, Zhang et al [30], Tang et al [31], and Wang et al [32] characterized the mesostructures’ evolution by digital images observed from a glass window on pressure vessels, but the soil sample has limitations. The above research efforts indicate that the testing methods for dynamic change of real mesostructures of soil lack being simple, straightforward, continuousness, and of low cost. Combined with triaxial equipment and observation equipment, the simultaneous observation and measurement of macro- and mesotests in the process of three-dimensional loading of soil are realized It provides equipment and method support for macro- and mesointegrated observation. The automatic tracking of dynamic change of pores (particles) and cracks is realized by using photogrammetry. en, statistical parameters, such as probability entropy and fractal dimension, are introduced to describe the pores (particles) and cracks direction distribution, area distribution, and complexity variation, respectively, by image processing technologies. e methods are used to analyze the high compressibility of a certain clay, shear zone development of cement soil, and erosive effects of ecological soil in order to investigate the continuous variation of mesostructure during the shear test. e results show that the characteristics of mesostructures correspond to the macroscopic law using this method. e aim of this paper is to provide a continuous and reliable test method for the characteristics of dynamic change of real mesostructure of soil in the conventional triaxial test
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