ASTM International

ASTM International

22 Articles found

Articles

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  • Consolidation Behavior of Clayey Soils Under Radial Drainage

    Consolidation Behavior of Clayey Soils Under Radial Drainage

    For Barron´s degree of consolidation, Ur, versus the time factor, Tr, relationship for soils undergoing consolidation with radial drainage for the equal vertical strain condition, a simple method has been developed to determine the value of the ...

    Sridharan A; Prakash K; Asha SR

  • The Relationship Between the Soil-Water Characteristic Curve and the Unsaturated Shear Strength of a Compacted Glacial Till

    The Relationship Between the Soil-Water Characteristic Curve and the Unsaturated Shear Strength of a Compacted Glacial Till

    Soils compacted at various “initial” water contents and to various densities should be considered as “different” soils from a soil mechanics behavioral standpoint even though their mineralogy, plasticity, and texture are the same. The engineering ...

    Vanapalli SK; Fredlund DG; Pufahl DE

  • Determination of Coefficient of Consolidation from Early Stage of Log <i>t</i> Plot

    Determination of Coefficient of Consolidation from Early Stage of Log <i>t</i> Plot

    The standard curve-fitting methods, Casagrande´s log t method and Taylor´s root t method, for the determination of the coefficient of consolidation use the later part of the consolidation curve and are influenced by secondary compression effects. ...

    Robinson RG; Allam MM

  • A Study of Strike-Slip Faulting Using Small-Scale Models

    A Study of Strike-Slip Faulting Using Small-Scale Models

    Results from tests on small-scale soft clay models subjected to strike-slip faulting in a 1-g environment are presented. Kinematic/boundary conditions and material ductility were dominant factors on model response. Material ductility significantly ...

    Lazarte CA; Bray JD

  • Wave Propagation in Soils: Multi-Mode, Wide-Band Testing in a Waveguide Device

    Wave Propagation in Soils: Multi-Mode, Wide-Band Testing in a Waveguide Device

    This paper presents the development of a waveguide device and the corresponding processing methodology to study wave propagation in particulate materials. Its main advantages are: the cancellation of biasing transfer functions (e.g., transducer, ...

    Fratta D; Santamarina JC

  • Advances in Conductometric Phase Transition Porosimetry

    Advances in Conductometric Phase Transition Porosimetry

    The paper describes advances in conductometric phase transition porosimetry (CPTP) test methods and procedures for measuring the pore size distribution of soil. Included are test methods and procedures for (1) measuring the “throat or neck” size ...

    Gunnink BW

  • Laboratory Evaluation of Horizontal Stress in Overconsolidated Sands

    Laboratory Evaluation of Horizontal Stress in Overconsolidated Sands

    This paper describes a method for the determination of in situ horizontal stresses of heavily overconsolidated sands using a stress-path triaxial apparatus. This method was proposed by Garga and Khan (1991), who applied it to overconsolidated clays. ...

    Abdi H; Garga VK

  • Effect of Simulated Roots on the Permeability of Silty Soil

    Effect of Simulated Roots on the Permeability of Silty Soil

    A preliminary laboratory testing program was conducted to investigate the potential effect of vegetation on the hydraulic conductivity of soils used to construct levee structures. The testing program was conducted using a silty sand soil with a ...

    Gabr MA; Akram M; Taylor HM

  • Moisture Increase in Expansive Soils at Developed Sites

    Moisture Increase in Expansive Soils at Developed Sites

    The purpose of this paper is to provide information pertinent to post-development depth-of-moisture increase in expansive soils underlying developed sites. In southern California, the developments are generally accompanied by irrigation around ...

    Sikh TS

  • Estimating Water Content of Soils from Electrical Resistivity

    Estimating Water Content of Soils from Electrical Resistivity

    Electrical resistivity has been demonstrated to be an effective predictor of various soil hydraulic properties including water content, degree of saturation, and hydraulic conductivity. Standardized laboratory procedures for measuring soil ...

    Kalinski RJ; Kelly WE

  • Temperature Dependence of Soil Water Potential

    Temperature Dependence of Soil Water Potential

    To understand the process of coupled heat and water transport, the relationship between temperature and soil water potential must be known. Two clays, Avonlea bentonite and Lake Agassiz clay, are being considered as the clay-based sealing materials ...

    Mohamed A-MO; Yong RN; Cheung SCH

  • Strength Changes in Sand Following Cyclic Shear

    Strength Changes in Sand Following Cyclic Shear

    Static torsional simple shear tests were performed on poorly graded sand, with and without prior cyclic loading, to evaluate changes in static shear strength. Specimens were prepared at three densities (loose, medium, and dense) and were subjected ...

    Turner JP; Kulhawy FH

  • Tensiometers&mdash;Theory, Construction, and Use

    Tensiometers&mdash;Theory, Construction, and Use

    Standard tensiometers are used to measure matric potential as low as -870 cm of water in the unsaturated zone by creating a saturated hydraulic link between the soil water and a pressure sensor. The direction and, in some cases, quantity of water ...

    Stannard DI

  • A New Method for the Determination of Coefficient of Consolidation

    A New Method for the Determination of Coefficient of Consolidation

    The time factor, T, and the degree of consolidation, U, from Terzaghi´s theory of consolidation can be shown to have a bilinear behavior when plotted as log (U/T) versus log T. Using this property, a method is proposed for the evaluation of the ...

    Pandian NS; Sridharan A; Kumar KS

  • Swelling/Shrinkage Characteristic Curve of Desiccated Expansive Clays

    Swelling/Shrinkage Characteristic Curve of Desiccated Expansive Clays

    The change in void ratio with change in water content of expansive clayey soils due to soil desiccation and water absorption has been identified as the integral/combined curve referred to as S-curve, which describes both swelling and shrinkage paths ...

    Hanafy EADE

  • Log-Log Method for Determination of Preconsolidation Pressure

    Log-Log Method for Determination of Preconsolidation Pressure

    A new method called the “log-log method” has been proposed for a more accurate determination of preconsolidation pressure. The method consists of plotting both the pressure p and corresponding void ratio e in logarithmic scale. The log e - log p ...

    Jose BT; Sridharan A; Abraham BM

  • Pore-Water Pressure Buildup in Clean Sands Because of Cyclic Straining

    Pore-Water Pressure Buildup in Clean Sands Because of Cyclic Straining

    The prediction of pore-water pressure buildup in sands caused by undrained cyclic loading is one of the key items in evaluating the potential for liquefaction of sandy sites during earthquakes. Presented herein are data indicating that, in ...

    Ladd RS; Dobry R; Dutko P; Yokel FY; Chung RM

  • Removal of Cementation Bonds in Stressed Overconsolidated Clays

    Removal of Cementation Bonds in Stressed Overconsolidated Clays

    Soils develop cementation during and after formation because of the effects of stress, time, and environment. The effects of cement removal on the change of state of soil under stress are discussed in this paper. The change in the state of stiff, ...

    Griffiths FJ; Joshi RC; Nagaraj TS

  • Stress Path and Permanent Deformations in Sand Subjected to Repeated Load

    Stress Path and Permanent Deformations in Sand Subjected to Repeated Load

    The development of permanent deformations in soil has been studied by a number of researchers using triaxial systems. In most cases soil specimens were subjected to a pulsating axial stress while the confining pressure was maintained constant. This ...

    Leshchinsky D; Rawlings DL

  • Compressibility Properties of a Horticultural Peat

    Compressibility Properties of a Horticultural Peat

    The compressibility of a typical horticultural peat has been studied in the laboratory. Compressibility is an important factor in the processing of this material since volume governs the cost of shipping. The final reconstituted volume and the ...

    Morin P