Fuzzy classification of soils based on Iranian standard of 2800

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Meshginghalam Haleh; EMAMI Tabrizi Mehrdad; Chenaghlou Mohammad Reza

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Journal Paper

Paper Information

Journal: Amirkabir Journal of Civil Engineering Year:2023 | Volume:54 | Issue:10 Page(s): 4035-4052

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Information Journal Paper

Title

Fuzzy classification of soils based on Iranian standard of 2800

Author(s)

Meshginghalam Haleh | EMAMI Tabrizi Mehrdad | Chenaghlou Mohammad Reza | Issue Writer Certificate

Keywords

Soil classification

Iranian Standard of 2800

Uncertainty

Statistical and Probabilistic methods

Fuzzy inference system

Abstract

Soil classification is a function of a region’s geological conditions, which according to the Iranian earthquake standard of 2800, it is consequently a function of average shear wave velocity, as well as average SPT blow count, and average undrained shear strength of cohesive soils in different layers for up to 30 meters depth. Boundaries of these geotechnical parameters are often defined as different crisp values in the earthquake design codes. Because of the uncertainties in the mentioned parameters and also the difference between values of these parameters in the real material and values obtained from the experimental tests for the determination of these parameters, Statistical and Probabilistic methods is needed. Due to the computational complexity of Statistical and Probabilistic methods, in this research, a Fuzzy inference system has been used for the decision of the classification of soil type, which can consider uncertainties without the need for complex mathematical calculations. For this purpose, after defining the effective parameters for determining the soil type, triangular membership functions were selected for them, and finally, a Fuzzy inference system was designed. According to the results, the proposed model provides more accuracy than the standard in the boundaries between two successive soil classes. Also, when the values of the parameters are far from the boundaries between successive soil classes, the Fuzzy inference system and the standard provide the same answers.

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