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首页> 外文期刊>Canadian Journal of Pure and Applied Sciences >THE STATUS OF SOIL AT THE PERMANENT SITE OF THE NNAMDI AZIKIWE UNIVERSITY, AWKA, SOUTHEASTERN NIGERIA
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THE STATUS OF SOIL AT THE PERMANENT SITE OF THE NNAMDI AZIKIWE UNIVERSITY, AWKA, SOUTHEASTERN NIGERIA

机译：尼日利亚东南部阿卡纳纳姆迪·阿齐基韦大学永久站点的土壤状况

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This paper presents an investigation on the properties of soils underlying the permanent site of the Nnamdi Azikiwe University, Awka, Nigeria. A total of 450 samples collected from 150 Hand auger drilled holes across the campus were subjected to different geotechnical tests. Geotechnical parameters tested for in the soil samples were mechanical analysis, Atterberg limits, compaction, CBR, bulk density, natural moisture content and shear strength. Results indicated that the soils consisted of predominantly sand-sized grains overburden (either SM or SC); percentage of fines ranged from 7 to 72%, sand 28 to 93% and gravel 0 to 40 %. Liquid limit values ranged from minimum value of 15 (at depth 0 to 1.5m) to maximum value of 78 (at depth ≥1.6m), while Plasticity index values ranged from non-plastic samples to a maximum value of 41. Plots of samples in the plasticity chart revealed the fines are predominantly clays and silts of low plasticity (CL - ML), and less amount of organic silts (MH or OH). Medium to high plasticity resulting from moderate to high clay content of the soil suggests volumetric changes, especially when the site is waterlogged. The bearing capacity and settlement (in particular compressibility) analyses confirmed that most locations within the site have low stability. A number of sampled points have their compression index values above 0.20, suggesting that those points would experience moderate compressibility over engineering time.
机译：本文提出了对尼日利亚Awka的Nnamdi Azikiwe大学永久站点下面的土壤特性的研究。从校园内的150个手持式螺旋钻机钻孔中收集的总共450个样品经过了各种岩土测试。在土壤样品中测试的岩土参数为机械分析，阿特伯格极限，压实度，CBR，堆积密度，天然水分含量和剪切强度。结果表明，土壤主要由覆盖沙粒的颗粒（SM或SC）组成。细粉的百分比为7％至72％，砂为28％至93％，砾石为0至40％。液体极限值的范围从最小值15（在0到1.5m深度）到最大值78（在≥1.6m深度），而可塑性指数值的范围从非塑料样品到最大值41。从可塑性图表中可以看出，细粉主要是低塑性的粘土和淤泥（CL-ML），而有机淤泥（MH或OH）的含量较少。由中等至较高的粘土含量导致的中等至较高的可塑性表明了体积的变化，尤其是在该场地为涝渍时。承载力和沉降（特别是可压缩性）分析证实，该场地中的大多数位置稳定性较低。许多采样点的压缩指数值都在0.20以上，表明这些点在工程时间内会经历中等程度的压缩性。

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