Obtaining representative samples for laboratory shear strength testing forms the foundation of a successful geotechnical investigation program. The selection of suitable laboratory testing methods and the understanding of their limitations in the mining of a mineral sands deposit is discussed. The pit slopes will comprise of cohesionless sand and silty sand. The method of recovering undisturbed samples in a deep drilling program is outlined. The use of undisturbed samples increases confidence and reliability in probabilistic stability analysis. The effective friction angle values from 40 consolidated undrained triaxial and 46 direct shear tests are compared. The direct shear test results are 5% lower than the triaxial test results due to subhorizontal bedding. In addition, the coefficient of variation for the triaxial and direct shear friction angle results are 4.3% and 9% respectively, indicating a larger dispersion in the direct shear test results. The triaxial and direct shear datasets result in distinctly different outcomes for pit slope optimisation studies with substantial financial implications. Incorporating triaxial test data in a 35° pit slope stability assessment results in a 36% higher confidence level of achieving or exceeding a factor of safety of 1.3, relative to using the direct shear test data.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Comparing Shear Strength Dispersion Characteristics of the Triaxial and Direct Shear Methods for Undisturbed Dense Sand


    Weitere Titelangaben:

    KSCE J Civ Eng


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2022-04-01


    Format / Umfang :

    9 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    A Comparative Study Between Unconsolidated Undrained Triaxial Shear Test and Direct Shear Test

    Raghava Swamy, B. V. / Balakrishna Reddy, S. / Girija Manohar, M. et al. | British Library Online Contents | 1998


    Simulating Ballast Shear Strength from Large-Scale Triaxial Tests

    Qian, Yu / Lee, Seung Jae / Tutumluer, Erol et al. | Transportation Research Record | 2013


    Review on soil shear strength with loam sand soil results using direct shear test

    El Hariri, Alaa / Elawad Eltayeb Ahmed, Ahmed / Kiss, Péter | Elsevier | 2023