Variation of friction angle and dilatancy for anisotropic cohesionless soils
18th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2013, Paris, Fransa, 2 - 06 Eylül 2013, cilt.2, ss.895-898, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Cilt numarası: 2
- Basıldığı Şehir: Paris
- Basıldığı Ülke: Fransa
- Sayfa Sayıları: ss.895-898
- Anahtar Kelimeler: Dilatancy, Friction angle, Granular material, Ko-consolidation, Sand
- Boğaziçi Üniversitesi Adresli: Evet
Özet
The goal of this paper is to investigate and quantify the variation of peak friction and dilatancy angles of anisotropic cohesionless soils as functions of the in-situ state of the soil. In this context, in-situ state of the soil is used as a broad term that encompasses the combined effects of the stress state, volumetric state, and stress history of the soil prior to any shearing. Accordingly, the parameters that define the in-situ state of soil are in-situ confining pressure (p′i), relative density (ID) and overconsolidation ratio (OCR), respectively. In order to quantify the influences of these parameters on the peak friction angle and dilatancy angle, a special testing program was designed that employs mainly CKoD triaxial tests. These tests were conducted on reconstituted sand samples at different p′i-ID-OCR combinations. Analyzing the obtained results, two new functions are proposed that allow the calculation of the peak friction angle and dilatancy angle of anisotropic cohesionless soils. The greatest advantage of the proposed functions is that they use directly measurable or calculable parameters as input. Finally, using similar test data collected from literature, the proposed empirical equations are validated.