Study of the soil-reinforcement friction coefficient

Soomar, Khattri Mohammed (1982) Study of the soil-reinforcement friction coefficient. MSc(R) thesis, University of Glasgow.

Abstract

This research study has been carried out to gain further insight into existing available testing methods for measuring a soil-reinforcement friction coefficient. Previous research work pertaining to soil-reinforcement friction mobilization, including testing methods and the relative influences of different factors affecting the value of the soil-reinforcement friction coefficient has been reviewed. Actual site material, strip and soil has been employed in this investigation. Shear tests on soil samples compacted at various densities using both direct shear and triaxial tests were carried out in order to develop a relationship between dry density and angle of internal friction. The relationships obtained using both testing methods were linear. Friction tests on both smooth and ribbed reinforcing strip samples at varying density were performed using a shear box. The results indicated a linear relationship between dry density and angle of skin friction for both types of reinforcement. On comparing the results of smooth and ribbed strips, it appeared that ribbed strip yielded a greater value of skin friction coefficient than smooth strip, both being lower at all densities than the coefficient internal friction of the soil alone. It was also noted that density had very little effect on the soil-reinforcement friction coefficient in the case of the smooth strip where as it had a significant influence in the case of the ribbed strip. The main part of the present investigation was a study of pull-out testing methods. For this purpose, an apparatus, at large scale, was constructed in which three series of tests were conducted. The first series of tests consisted of pulling the strip out and calculating the apparent friction coefficient. In the second series of tests the strip together with the facing plate was pulled out at the same normal pressure range, as in the first series, in order to determine the effect of the testing method. The results showed that both pull-out testing methods in loose and dense soil gave higher value of apparent friction coefficient compared to the direct shear method and indicated a trend of decreasing apparent friction coefficient-with-increasing normal pressure. The dense soil yielded higher value of apparent friction coefficient than the loose soil. A decrease of 3.5

• Item Type: Thesis (MSc(R))
• Qualification Level: Masters
• Additional Information: Adviser: H B Sutherland
• Keywords: Civil engineering
• Date of Award: 1982
• Depositing User: Enlighten Team
• Unique ID: glathesis:1982-72568
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 11 Jun 2019 11:06
• Last Modified: 11 Jun 2019 11:06
• URI: https://theses.gla.ac.uk/id/eprint/72568