Abstract
This paper aims at introducing the Fall Cone Test (FCT) to obtain the shear strength of clayey soils and reveals its applicability by comparing the results obtained from that of Unconfined Compression Test (UCT). Furthermore, the liquid and plastic limit obtained from Casagrande method also compared with that obtained from FCT. For these, soils were collected from Godagari, Tanore, and Nauhata from Rajshahi District (RD). At first, Hydrometer analysis was performed in each soil to know the physical properties. Then Atterberg Limit test was carried out by considering Casagrande Method. After that UCT was shown in each land to find the shear strength of the clay soils. Lastly, FCT was conducted to find out the shear strength, LL and PL. FCT shows a lower amount of liquid and plastic limit than the values measured in the Casagrande Method except plastic limit for Tanore for FCT whereas Godagari shows the higher value of shear strength considering FCT. This research can be concluded with further research should be conducted to ensure its accuracy. On the other hand, it can be drawn which soil have more consistency and shear strength considering others.
Highlights
Clay is a type of soil material which carries the fickle quantity of water entrapped in the mineral structure
This research was conducted to compare the experimented results of consistency behaviour and shear strength of clayey soils collected from three different locations of Rajshahi District, Bangladesh namely Godagari, Tanore, and Nauhata which were previously noted with clay by literature
The Liquid Limit (LL) for three grounds obtained from Fall Cone Test (FCT) results for Godagari, Tanore and Nauhata is 29.03%, 31.59%, and 27.98% whereas that of the soil derived from Casagrande method are 36.14%, 30.08%, and 28.96% respectively
Summary
Clay is a type of soil material which carries the fickle quantity of water entrapped in the mineral structure. Due to ample void ratio, clay can be classified as the fine-grained natural rock as well. Clays show plasticity because of their moisture content and convert into hard, brittle and non– plastic materials when clays undergo drying or firing. Silts and clays can be separated by the soils' Atterberg limits depending on the plasticity properties of the soil. Based on the gradation of ISO 14688, particles smaller than two μm are classified as clay particles, and silt particles are more substantial than that. The term Shear strength indicates the sustainability of shear stress of the soil. The shear resistance of land is a result of friction and interlocking of particles, and possibly cementation or bonding at particle contacts
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