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Utilization of soil nailing technique to increase shear strength of cohesive soil and reduce settlement

Journal of Rock Mechanics and Geotechnical Engineering 2017年第6期9卷 1104-1111页

作者： W.R.Azzam A.Basha Faculty of Engineering Tanta UniversityTantaEgypt Faculty of Engineering Kafrelsheikh UniversityKafrelsheikhEgypt

This article deals with the assessment of the soil nailing technique with a vertical inclusion to improve the geotechnical parameters of cohesive soil. A series of unconfined compression tests and direct shear tests were carried out to establish the stressestrain relationship and strength characteristics of the reinforced clay sample by vertical steel nails. The shear strength performance of the new composite material was tested by varying the number of vertical inclusions, the embedment depth and the alignment radius. The results confirmed that the vertical bars/inclusions shared the vertical applied load with clay. Increase in the number of vertical inclusions significantly increases the shear strength and the stiffness with a remarkable reduction in settlement. When the clay samples were reinforced with six inclusions along the perimeter, the shear strength was increased to 231% for the embedment depth ratio equal to 0.85. To obtain the optimum effect in eliminating shear failure, the vertical inclusions should be extended to a deeper zone with sufficient numbers. It has been found that the vertical inclusions significantly influence the shear strength, and the brittle or general shear failure of the unreinforced sample can be diverted to partial/plastic shear failure.

关键词： Cohesive soil Shear strength vertical inclusion Stiffness Settlement

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