Strength characteristics of an array of fine-grained sandy soil with vertical reinforcement elements from coarse aggregate

Abstract

This work's main objective was to increase the value of the coefficient of friction between soil grains in the test specimen by adding coarse gravel columns to the fine, sandy soil. In this regard, it was determined that a soil's lowest void ratio should be used as a measuring criterion because it matches the crucial requirement of an independent friction angle from soil gradation, all of the results above were calculated using the outcomes of a laboratory test method. Pressure addition was used to determine the relationships between a mixture with a low void ratio and the critical state or high coefficient of friction angles. Determining the strength characteristics of sand-gravel mixtures may be helped by the linkages. The riverbanks of the Tigris, which had previously been subject to similar cracks and collapses, served as the location for the collection of samples for the purpose of this research. The completion of the study and examination, it was discovered that the soil is composed of river sediments and that it has the potential to be categorized as soil that is constructed of fine sand. It is generally acknowledged that shear loads are a significant element that contributed to the demise of numerous riverbanks. In this particular field of research, a variety of coarse aggregate column widths and aggregate sizes used to increase the friction angle of soil are investigated via direct shear testing. When analyzing the qualities of soil, the minimal void ratio is important, Particle size distributions and particle shapes influence their relationship to compressive characteristics, permeability, and shear strength of the soil. While previous studies have modeled the minimal void ratio in terms of the impact of particle size distributions, they have largely disregarded the role that particle shape might play in this parameter. This work examines the effects of three different sizes of coarse aggregate on the minimal void ratio with respect to particle size distributions. Experiments have shown that when the number of fine particles increased the minimum void ratio reduced. The more irregularity there was in the particle shapes, the more difficult it was for particles to make touch with one another, and the more space there was between them. Diagrams depicting the connection between shear strength, angle of friction, and particle size distribution were created from experimental data.