soil shear testing Articles

  • 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

  • Bromhead Ring Shear Test Procedure

    Existing test procedures and a proposed modification for the Bromhead ring shear apparatus were found to yield drained residual strengths higher than values back-calculated from field case histories. A new test procedure is presented that yields drained residual strengths that are in excellent agreement with field case histories. The new test procedure utilizes the unmodified Bromhead ring shear ...


    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

  • 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

  • Effect of Testing Procedure in Ring Shear Tests

    This technical note describes a comparison between the results obtained from single-stage and multistage ring shear tests on two different types of normally consolidated clay. The results confirm the brittle behavior of normally consolidated soils containing a high proportion of clay particles and the curved nature of the residual stress failure envelope. Detailed examination of the test data ...


    By ASTM International

  • A Biaxial Apparatus for Testing Soils

    A biaxial compression apparatus for investigating shear-band formation and growth in dry and water-saturated sand and clay specimens is described. This apparatus is a modification of the device designed by Vardoulakis and Goldscheider [1] for testing planar shear banding in sands. The modifications involve improved axial load guidance, low friction linear bearing, and enhanced load and ...


    By ASTM International

  • Statistical Description of Triaxial Shear Test Results

    Any probabilistic approach to slope stability assessment requires an adequate statistical description of soil strength. Current statistical methods of strength description are unsuitable for this purpose. A statistical technique of soil strength description appropriate for the probabilistic assessment of slope stability in c', f' soils under drained conditions is developed here. The technique is ...


    By ASTM International

  • Suggested Method for Performing the Borehole Shear Test

    ASTM Committee D18.02 on Sampling and Related Field Testing for Soil Investigation (Mr. Ralph Brown, Chairman) suggested that this proposed suggested method be published herein to provide exposure and solicit comments for users. The purpose is to improve its clarity, accuracy, and acceptibility, so that in the future, Committee D18.02 may submit it for publication in the Annual Book of ASTM ...


    By ASTM International

  • Testing Techniques for Evaluating the Shear Strength of Lime/Fly Ash Slurry Stabilized Soil

    Lime slurry pressure injections have been successfully used to stabilize and control swelling and expansive soils and low-strength clay soils to depths of up to 40 ft (12 m). When the activity of soils is somewhat lower, or when soils have large void ratios, lime/fly ash (L/FA) slurry mixtures have been injected to fill voids. It has been postulated that this action creates stronger seams, helps ...


    By ASTM International

  • A Multiple Purpose Soil Testing Apparatus

    A relatively compact soil testing system that is capable of performing monotonic/cyclic triaxial and torsional simple shear tests has been developed. A high-torque direct-drive, servo/stepper motor is used to provide the driving force. Under the servo mode, the motor could be controlled to provide a constant torque, which is used in stress-controlled tests. Strain-controlled tests are conducted ...


    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

  • 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

  • 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

  • Clay-on-Steel Ring Shear Tests and Their Implications for Displacement Piles

    This paper presents results from ring shear tests involving shearing of clay against steel interfaces. The effect of rate of shearing on the shear resistance between the soil and steel at large displacements was examined. It is shown that the rate of shearing has a significant effect on the shear resistance between soil and steel. The implications of the results for the behavior of displacement ...


    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

  • 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

  • Direct and Simple Shear Testing of Two Canadian Sensitive Clays

    Several series of consolidated undrained direct translatory shear (DTS) and direct simple shear (DSS) tests have been performed on two sensitive clays of eastern Canada. Before shearing, the specimens were consolidated to pressures varying between 20 and 350 kPa. The investigation was performed with the aim of determining both the anisotropic nature and the effect of the consolidation pressure ...


    By ASTM International

  • Modified Bromhead Ring Shear Apparatus

    The main factor affecting the drained residual strength measured in the Bromhead ring shear apparatus is the magnitude of wall friction developed along the inner and outer circumferences of the confined specimen. The magnitude of wall friction increases with the depth of the remolded specimen, and thus the plane of least wall friction occurs at or near the soil/top porous stone interface. As the ...


    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

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