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Analysis on the effects of gradation of sand on shear strength characteristicsn

Analysis on the effects of gradation of sand on shear strength characteristics / Prabagaran Srigaran
Kajian ini tertumpu pada penggredan pasir yang mempengaruhi parameter kekuatan ricih dengan ketara. Kajian ini juga memberi tumpuan kepada kesan kotak ricih kecil dan besar pada penggredan tanah yang berlainan. Semua ujian dijalankan pada pasir kering, saiznya dari 0.063mm hingga 2mm. Analisis ayakan dilakukan untuk mengklasifikasikan bahan ke pasir halus, pasir sederhana dan pasir kasar, manakala, ujian ricih langsung dalam skala kecil dan besar dijalankan untuk menentukan parameter kekuatan ricih sampel. Peningkatan ini disebabkan oleh kesudutan yang lebih baik dan kekasaran permukaan pasir kasar yang menjadikan pasir lebih tahan terhadap ricih. Saiz kotak ricih mempunyai kesan terhadap keputusan ujian. Skala kotak ricih yang lebih besar memberikan sudut geseran yang rendah. Penurunan sudut geseran disebabkan oleh ruang yang cukup untuk zarah-zarah pasir di dalam kotak untuk mengembangkan kumpulan geseran individu sepenuhnya dalam zon ricih. Dibuktikan bahawa pasir kasar mempunyai sifat kekuatan ricih yang lebih baik dan sesuai digunakan untuk pembinaan struktur geoteknik yang akan menghalang kegagalan pada masa akan datang. Hasil kotak ricih yang lebih besar lebih dipercayai kerana ia memberikan hasil yang lebih tapat berbanding dengan kotak ricih kecil. Ia akan menghalang penganggran berlebihan parameter kekuatan ricih dalam reka bentuk. _______________________________________________________________________________________________________ This study concentrated on gradation of sand which affects shear strength parameters significantly. This study also focusing on the effects of small and large shear boxes on different soil gradation. All tests were conducted on fully dried sand, sizes ranging from 0.063mm to 2mm. Sieve analysis is done to classify the material into fine sand, medium sand and coarse sand, while direct shear test in small and large scale were conducted to determine shear strength parameters of the samples. It was found that friction angle tend to increase as the percentage of coarse sand increases in the sample. This is due to the improved angularity and surface roughness of the coarser sand which makes the sand to be more resistant against shearing. Size of shear box has an impact on test results as friction angle decreases when larger scale of shear box is used. The decrement in friction angle is caused by space enough for the sand particles in the box to develop individual shear bands fully within the shear zone. It is proven that coarser sand has better shear strength properties and suitable to be used for the construction of geotechnical structures which will prevent failures in future. Results of larger shear box is more reliable as it gives more accurate results compared to small shear box. It will will prevent overestimation of shear strength parameters in design.
Contributor(s):
Prabagaran Srigaran - Author
Primary Item Type:
Final Year Project
Identifiers:
Accession Number : 875008343
Language:
English
Subject Keywords:
gradation; sand; shear
First presented to the public:
6/1/2019
Original Publication Date:
9/27/2019
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Civil Engineering
Citation:
Extents:
Number of Pages - 79
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2019-09-27 16:25:05.674
Submitter:
Mohd Jasnizam Mohd Salleh

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