Uniformity Coefficient Cu And Coefficient Of Curvature Cc Of Soil The uniformity coefficient (cu) is defined as the ratio of d60 to d10. a value of cu greater than 4 to 6 classifies the soil as well graded. when cu is less than 4, it is classified as poorly graded or uniformly graded soil. uniformly graded soil has identical particles with cu value approximately equal to 1. a uniformity coefficient value of 2. Uniformity coefficient (cu): it is the ratio between the sieve size which will pass 60% of the sand by weight (d60) to the effective size (d10). cu = d60 d10. a higher cu value indicates a wider range of particle sizes and, consequently, a less uniform soil. coefficient of curvature (cu): it is calculated as the square of the ratio (d30)^2.
Uniformity Coefficient Cu And Coefficient Of Curvature Cc Of Soil Curve can be described through two simple parameters, namely, coefficient of uniformity (cu) and coefficient of curvature (cc or cz). they are defined as: c d u d = 60 10 and c d c dd = 30 2 60 10 0 20 40 60 80 100 0.001 0.01 0.1 1 10 100 grain size (mm) % passi n g d 30 hydrometer sieve d = 0.013 mm d = 0.47 mm d = 7.4 mm 10 30 60 fines sands. Information obtained from the particle size analysis (uniformity coefficient c u, coefficient of curvature, c c, and effective size, d 10, etc.) is used to classify the soil. particle size is one of the criteria used to ascertain whether the soil is suitable for building roads, embankments, dams, etc. The uniformity coefficient (c u) the uniformity coefficient (c u ) expresses the variety in particle sizes of soil and is defined as the ratio of d 60 to d 10 ( figure 1 ). the value d 60 is the grain diameter at which 60% of soil particles are finer and 40% of soil particles are coarser, while d 10 is the grain diameter at which 10% of. Soil gradation is determined by analyzing the results of either a sieve analysis or a hydrometer analysis. uniformity coefficient calcultaion. cu = d60 d10. coefficient curvature calculation. cc = (d30)2 d10 x d60. calculating the coefficients of uniformity and curvature requires determining grain diameters.
Uniformity Coefficient Cu And Coefficient Of Curvature Cc Of Soil The uniformity coefficient (c u) the uniformity coefficient (c u ) expresses the variety in particle sizes of soil and is defined as the ratio of d 60 to d 10 ( figure 1 ). the value d 60 is the grain diameter at which 60% of soil particles are finer and 40% of soil particles are coarser, while d 10 is the grain diameter at which 10% of. Soil gradation is determined by analyzing the results of either a sieve analysis or a hydrometer analysis. uniformity coefficient calcultaion. cu = d60 d10. coefficient curvature calculation. cc = (d30)2 d10 x d60. calculating the coefficients of uniformity and curvature requires determining grain diameters. The coefficient of gradation may he expressed as: where cc is the coefficient of gradation and d30 diameter corresponding to 30% finer. for the particle size distribution curve of soil b shown in figure 2, the values of d10 d30 and d60 are 0.096 mm, 0.16 mm and 0.24 mm, respectively. the uniformity coefficient and coefficient of gradation are:. For this aim, genexprotools 5.0 software was used. in this model, hybrid cement (hc), percentage nanostructured quarry fines (nqf), clay content (c), clay activity (ac) and frictional angle (f) are considered the inputs of the model (terminal set) and coefficient of curvature (cc) and coefficient of uniformity (cu) are set as the outputs.
Uniformity Coefficient Cu And Coefficient Of Curvature Cc Of Soil The coefficient of gradation may he expressed as: where cc is the coefficient of gradation and d30 diameter corresponding to 30% finer. for the particle size distribution curve of soil b shown in figure 2, the values of d10 d30 and d60 are 0.096 mm, 0.16 mm and 0.24 mm, respectively. the uniformity coefficient and coefficient of gradation are:. For this aim, genexprotools 5.0 software was used. in this model, hybrid cement (hc), percentage nanostructured quarry fines (nqf), clay content (c), clay activity (ac) and frictional angle (f) are considered the inputs of the model (terminal set) and coefficient of curvature (cc) and coefficient of uniformity (cu) are set as the outputs.
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