soil shear testing Articles

  • Shear Strength Tests for Coarse Granular Backfill and Reinforced Soils

    In order to overcome the limitations of the current standard small direct shear box in testing the shear strength of coarse granular backfill materials, a large direct shear apparatus (1000 by 1000 by 940 mm) was constructed at Carleton University and a series of direct shear tests were conducted with coarse granular soils. In addition, several direct shear tests on soils reinforced with geogrids ...


    By ASTM International

  • Mikasa's Direct Shear Apparatus, Test Procedures and Results

    Mikasa´s direct shear apparatus and test procedures are presented. This test apparatus was developed in 1960 to conduct constant volume shear tests, which correspond to undrained shear tests for saturated soils. This apparatus overcomes several defects of the traditional apparatus. The advantages of the direct shear test over the triaxial test are discussed, and typical examples of test results ...


    By ASTM International

  • Effect of Reinforcement Layout on Soil Strength

    This paper presents the results of a laboratory investigation of the shear strength of soil reinforced with metal strips. The investigations were conducted using a large, specific purpose-built shear box. The effects of reinforcement layout, as well as type of strips and quantity of reinforcement, on soil shear strength at failure were tested. The investigations involved three reinforcement ...


    By ASTM International

  • Multistage Direct Shear Testing of Unsaturated Soils

    A conventional direct shear box was modified to accommodate the testing of an unsaturated soil. The design concepts and necessary modifications to the apparatus are described. A multistage testing procedure is outlined. Typical results from direct shear tests are presented. The results illustrate the relationship between suction and shear strength for a glacial till ...


    By ASTM International

  • A Cyclic Undrained Simple Shear Testing Method for Soils

    An undrained simple shear testing method for soils using a torsional shear apparatus is described, in which a hollow cylindrical specimen is sheared under plane strain conditions without deforming and rotating all horizontal planes. In this testing method, the simple shear deformation mode is achieved only by several mechanical means without using an automated pressure control system. Typical ...


    By ASTM International

  • The Vane Cone: A New Device for Soil Shear Strength Measurement

    A considerable number of in-situ tests have been devised for measuring field soil shear strength parameters. These tests include, among many others, cone penetration and vane shear devices. The conventional form of each of these two devices controls the type of soil deformation, which may limit the use of the measured soil shear resistance data. In this study both vane and cone devices were ...


    By ASTM International

  • An Automated Electropneumatic Control System for Direct Simple Shear Testing

    This paper describes the design and implementation of an automated electropneumatic control system for direct simple shear testing of cohesive soils. The hardware and software used to perform automated application of consolidation increments and for subsequent constant volume shear of soil specimens is described in detail. Two servo-control algorithms are used to conduct a test, one for ...


    By ASTM International

  • Evaluation of Shear Strength in Cohesive Soils with Special Reference to Swedish Practice and Experience

    The paper describes how the Swedish Geotechnical Institute (SGI) currently proceeds in the evaluation of shear strength in cohesive soils. Information is given on how different test results and empirical experience can be weighted and combined to give the best possible estimation of the shear strength properties in cohesive soils. The procedure described has evolved during the continuing work at ...


    By ASTM International

  • Cohesive Soil Behavior Under Random Excitation Conditions

    A testing program was undertaken in which cohesive soil at different confining pressures was tested in a resonant column device using random torsional excitation in addition to conventional sinusoidal excitation. The damping and shear modulus from random loading testing were determined by both the power spectral density function and the transfer function method. Evaluation of the dynamic soil ...


    By ASTM International

  • A Constant Normal Stiffness Direct Shear Device for Static and Cyclic Loading

    A device has been designed and built to carry out both static and cyclic direct shear tests on specimens of soil and rock and on interfaces of soil or rock and construction materials. The device has the special capability of allowing the shear deformation to proceed under conditions of constant normal stiffness. This is in contrast to the more conventional direct shear devices, which permit ...


    By ASTM International

  • In-Situ Shear Modulus of Sands by a Flat-Plate Penetrometer: A Laboratory Study

    A flat-plate penetrometer, similar to the flat-dilatometer, has been constructed and used in a series of laboratory experiments to estimate the shear modulus of cohesionless soils under repetitive loading conditions. Tests were performed on sand specimens prepared at different relative densities and loaded vertically to simulate the overburden pressure at different depths. Results indicate, ...


    By ASTM International

  • The Multidirectional Direct Simple Shear Apparatus

    The paper describes a new simple shear testing device, the multidirectional direct simple shear (MDSS) apparatus, for testing soil specimens under conditions that simulate, at the element level, the state of stress acting within the foundation soil of an offshore Arctic gravity structure. The MDSS uses a circular specimen that is consolidated under both a vertical effective stress (s'vc) and a ...


    By ASTM International

  • Influence of Test Chamber Boundary Conditions on Sand Bed Response

    Two series of tests were performed on calcareous and silica sands in different test chamber sizes and with different base conditions to investigate the influence of test chamber boundary conditions on model pile foundation behavior.

    The first series of tests investigated the effects of shear resistance between the soil and the internal wall of the test chamber upon the distribution of ...


    By ASTM International

  • Soil-Geogrid Reinforcement Interaction by Pullout and Direct Shear Tests

    Pullout and direct shear tests have been conducted to investigate the soil-reinforcement interaction behavior in pullout and direct shear mechanisms. An apparatus—discussed in this paper—has been developed that is capable of performing both pullout and direct shear tests. Displacement measurements to monitor dilatancy on the backfill soil during pullout tests are incorporated in the apparatus. ...


    By ASTM International

  • Design and Testing of a Synthetic Clay Soil

    A synthetic clay soil mixture was designed and fabricated to comply with similitude requirements set forth in a dynamic scale-model pile group foundation test. The prototype soil was a stiff, fissured, overconsolidated clay soil at the University of Houston Pile Test Facility. The dynamic response of the model soil was determined through testing by resonant column/torsional simple shear methods ...


    By ASTM International

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