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首页> 外文期刊>Geosciences >Engineering Characterization of Subgrade Soils of Jimma Town,Ethiopia,for Roadway Design
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Engineering Characterization of Subgrade Soils of Jimma Town,Ethiopia,for Roadway Design

机译：埃塞俄比亚Jimma镇路基土壤工程特征，巷道设计

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摘要

Soils are naturally occurring materials that carry loads of civil engineering structures including roads and buildings. However, not all natural soils are suitable for such uses due to limited strength and instability under varying environmental conditions. A lack of adequate geotechnical investigations and soil characterization can result in the over-design of foundations, unexpected excavations to remove unsuitable soils, cost overruns, construction delays; and, contract disputes. In this research, an experimental plan was executed to determine the engineering properties of subgrade soil in Jimma Town in southwestern Ethiopia by using both disturbed and undisturbed soil samples. The plan included tests to determine the moisture content, specific gravity, grain-size analysis, Atterberg limits, compaction-density relationship, California Bearing Ratio (CBR), unconfined compression strength, and triaxial shear strength. X-ray diffraction (XRD) analysis was also conducted to determine the chemical composition of the soil. The soil characterization indicated that soft clay is the predominant subgrade soil type and that it has a very low load-bearing capacity, high plasticity, low strength and, high compressibility, which makes the soil unsuitable to serve as a highway subgrade without the help of soil improvement techniques.
机译：土壤是天然存在的材料，可承载包括道路和建筑物在内的土木工程结构的负荷。然而，由于在不同的环境条件下，所有天然土壤都适用于由于有限的强度和不稳定性。缺乏足够的岩土性调查和土壤表征可能导致基础的过度设计，出乎意料的挖掘来消除不合适的土壤，成本超支，建设延误;而且，合同纠纷。在这项研究中，执行了一个实验计划，以确定埃塞俄比亚西南部吉米镇的吉米镇的工程性质，通过扰乱和未受干扰的土壤样品。该计划包括测试确定水分含量，比重，粒度分析，Atterberg限制，压实密度关系，加利福尼亚轴承比（CBR），非束缚的压缩强度和三轴剪切强度。还进行了X射线衍射（XRD）分析以确定土壤的化学成分。土壤表征表明，柔软的粘土是主要的路基土壤类型，其具有非常低的承载能力，高可塑性，低强度以及高压缩性，使土壤不适用于没有帮助的高速公路路基土壤改进技术。

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