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Abstract
Artificial compaction is a commonly practiced ground improvement technique around the world. Yield stress is an important parameter to quantify and analyze the strength and compressibility behavior of the artificially compacted clays; such materials are indeed of practical significance in various projects, e.g., engineered landfills, clay liners, etc. The present study aims to investigate the influence of different geotechnical characteristics of compacted clays of wide plasticity range on the compaction induced yield stress, and also to develop the correlational models to quickly predict the yield stress. Three natural clayey soil samples of different geotechnical properties were collected from different sites; 27 more samples of varying index properties were prepared by mixing bentonite with natural soil samples at varying rates. Series of one-dimensional consolidation tests were performed to determine compressibility parameters like yield stress, compression index, and coefficient of volume compressibility. Atterberg’s limits, grain size, compaction characteristics, and compressibility have a significant influence on the compaction induced yield stress. Predictive models of yield stress are also developed by using the plasticity index, optimum water content, and maximum dry unit weight as independent variables. Moreover, developed models are validated based on the independent data.
Highlights
The shear strength and compressibility are considered to be the two most necessary characteristics of a cohesive soil mass in the design and analysis of many civil engineering structures like dams, highways, embankments, and foundations
There are two crucial consideration one is the compressibility of soil, which is the measure of the volumetric change response of the soil mass under the load, and other is the past pressure that soil mass has undergone
Having experienced high past pressure leads to lesser consolidation settlement and higher shear strength of the soil mass; such soil mass is termed as over-consolidated soil
Summary
The shear strength and compressibility are considered to be the two most necessary characteristics of a cohesive soil mass in the design and analysis of many civil engineering structures like dams, highways, embankments, and foundations. Yield stress is the quantitative parameter to examine the performance of the artificially compacted soil mass against failure and consolidation settlement. Keeping in view the feasibility of the usage of diversified compacted clayey soils in the fields and scarcity of literature on the induced yield stress behavior of such clays, the objectives of the present study are: (1) to investigate the yield stress behavior against grain size, Atterberg’s limits, compaction characteristics, and compressibility of low. To perform the one-dimensional consolidation tests, soil samples were remolded at a maximum dry density (γdmax) and optimum water content (wopt) determined from standard compaction test in a compaction mold. Consolidation test was performed to determine the compression index, coefficient of volume compressibility, initial void ratio, and yield stress. The effects of grain size, Atterberg’s limits, compaction characteristics and compressibility parameters on yield stress were
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