20 Articles found
ASTM International Articles
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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 ...
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Grain-Size Distribution of Mixed Aggregates
When various aggregates are to be combined in order to obtain a mix having a desired grain-size distribution, current methods are based on a trial-and-error approach. It is shown in this paper that the process of combining various soils or ...
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Some Experiments on Restrained Shrinkage of Clays Undergoing Drying
This paper describes engineering applications which show the engineering significance of testing the phase composition of soils, including determining the level of water saturation. It further explains why, in order to accurately model in situ ...
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<i>B</i>-Value Measurements for Granular Materials at High Confining Pressures
The pore-pressure coefficient, B, is used often to check the degree of saturation of triaxial specimens. A B-value approaching unity is taken to indicate full saturation. The B-value has been measured experimentally at high confining pressures (0.07 ...
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Friction at the Cohesionless Soil-Structure Interface: Effect of Various Parameters according to a Classic Study and a New Approach
A direct shear box, a ring shear apparatus, and a minipressuremeter are used: (1) to study the behavior of the cohesionless soil-structure interface; (2) to evaluate the friction mobilized at this interface. Tests have been carried out with a ...
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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 ...
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The Behavior at the Shrinkage Limit of Clay Undergoing Drying
In this paper, possible links between the shrinkage limit and distinct changes in other properties of a clay soil undergoing drying are discussed. These properties include the volumetric air content of the soil, the heat of wetting, the tensile ...
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Measurement of the Pore Pressure Parameter <i>C</i> Less Than Unity in Saturated Sands
Two saturated sands, Monterey No. 0/30 and Enewetak coral, tested undrained under one-dimensional strain loading, were found to have values of the pore pressure parameter C, less than unity. The C parameter for Monterey No. 0/30 sand, determined to ...
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Blast-Induced Liquefaction of an Alluvial Sand Deposit
A series of six different explosive charges ranging from 0.0045 to 9.06 kg were detonated at a depth of 3 m below a sand island in the South Platte River, northeast Colorado. Pore pressure, particle velocity, and residual pore pressure were measured ...
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Tensiometers—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 ...
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Total Suction of Artificial Mixtures of Soil Compacted at Optimum Water Content
The effect of soil composition on total suction is investigated. Thermocouple psychrometers are used to measure total suction of compacted specimens of artificial soil mixtures prepared using kaolinite, sodium montmorillonite, and a fine sand. ...
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Resonant Column Tests on Partially Saturated Sands
This paper describes the measurement of the influence of capillary effects on the dynamic shear modulus of partially saturated sands. A Hall-type resonant column apparatus was used to perform the experiments. The materials tested included natural ...
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Determination of Clay Size Fraction of Marine Clays
This technical note describes a study on the effect of different dispersing agents and the quantity of same on the grain-size distribution and in particular the percentage of clay size. The results confirm that the existing practice of using 100 mL ...
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Compaction Control and the Index Unit Weight
Procedures for measurement of percent compaction and several related practical issues are discussed. When measuring percent compaction, the “maximum” unit weight should be determined for each field unit weight test or nuclear unit weight measurement ...
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The Thawed Strength of Soil Compacted While Frozen: An Introductory Study
In the northern United States and in Canada, expensive earthmoving equipment usually stands idle during winter months. Considerable overall economies would result if soil could be excavated, transported, and recompacted while frozen. If engineers ...
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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 ...
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Determining Preconsolidation Stress and Penetration Pore Pressures from DMT Contact Pressures
Over recent years, several geotechnical explorations in clay deposits have shown the flat dilatometer test (DMT) to provide reasonable estimates of in-situ overconsolidation ratio with depth. Why should the horizontal stress index (KD = initial ...
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Methods of Evaluating the Expansion Potential of Compacted Soils with Significant Fractions of Large Aggregate
A laboratory investigation of the expansion potential of compacted soils with large-sized aggregate has been conducted. Methods developed for determining expansion potential include (1) laboratory expansion testing of representative specimens ...
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Accuracy of the Density Scoop for Unit Weight Determinations in Cohesionless Soils
An assessment is made of the accuracy of the Selig density scoop for determining the unit weight of dry cohesionless soils. Seven different soils were used in the study. The results show grain size and density dependence. Recommendations are made ...
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Suggested Method for Soil Specimen Remolding by Wet-Raining
A method for remolding a granular soil material by a sedimentation process is proposed. The process may produce a soil structure which approximates that produced in a natural alluvium environment.