Unified Soil Classification System

2072 Words 9 Pages
I.a. Background Information

The data in this report were based on the practicals in the laboratory. The data were used to identify and classify soils for engineering applications. The data were tabulated using Unified Soil Classification System (USCS) method, which is non-laboratory test and 2 classification of soils based on laboratory test. The two laboratory test classify soil methods are Classification of soil based on particular size distribution and Classify soil based on Atterberg Limits. The soil samples from sites known as bore hole and called BH1, BH2, and BH3.

I.b. Problem Description

Sustainable Earth firm commissioned to conduct a feasibility study for an earthwork project that includes the construction of an earth dam. The
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Further, if the grains are classified with fine grained soils, it needs further tests. The tests basically to know the strength crushing charachteristics, dilatency (reaction to shaking), and toughness (consistency near plastic limit). By crushing a clump of the dried material, the dry strength can be determined. Then, it is mixed with water and formed to a flat disk shape. Shake your palm hand to determine the dilatency. The toughness then determined by push the soil with your fingers and see the …show more content…
Furthermore, from Figure 6 below reveal that BH3 was in the group of CH according to the plasticity chart. As the PI is more than 30%, this soil categorised as a highly plastic soil.

Figure 6: Plasticity Chart for laboratory classification of fine grained soils

III. Disscussion and Conclusion

Every zone has its principal purpose and function of a dam to achieve the basic objectives. The core zone needs to have an impermeable barrier as it is the body of the dam. To hold the body, it needs impervious soils. In addition, it needs to avoid soils that have high compressibility and high plasticity index as theyare easily swelled and cracked. The stability zones are between the cores, so, it needs to protect the core. The materials needed must relatively pervious and bear any exposures to the atmosphere. The filter zones handles the seepage water to maintain the original particles of soils. BH1 soil is suitable for the filter zones, as it consists particles of coarse grained, which is ideal for filtering and handling seepage due to their large sizes. BH2 is suitable for stability zones as it has low plasticity soil that shows low volume change and have a highly permeability to allow water to go through. Last but not least, BH3 soil is suitable for the core zone as it has relatively high plastic soil that exhibits large volume change within the moisture content. Moreover, it has low permeability and high liquid limit to

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