Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 27 for “"silty sand"”.
-
Landslide-pipeline interaction for onshore slopes in silty sand
Onshore oil and gas pipelines are often routed through hazardous terrain owing to the need to traverse large distances and inevitably crosses large slopes and river valleys. A type of linear critical infrastructure, pipelines must be designed to withstand the soil forces created by landslides, …
-
Evaluation of liquefaction potential of silty sand based on Cone Penetration Test
… it was thought to be mainly a problem with clean sand, and most of the research has focused on these soils. However, as case history information has come to light, it has become apparent that silty sands are commonly involved, and in some cases even silts. This has generated a need for knowledge …
-
Dynamic Full-Scale Testing of a Pile Cap with Loose Silty Sand Backfill
… full-scale testing of a pile cap with loose silty sand backfill to quantify the contribution of the passive earth resistance to the lateral force resistance. The test cap is 1.12 m tall and 5.18 x 3.05 m in plan view, connecting 12 steel pipe piles (324mm O.D) placed in a 4 x 3 pattern with …
-
Dynamic Testing of a Full-Scale Pile Cap with Dense Silty Sand Backfill
… tests were performed on a pile cap with a dense silty sand backfill condition. Two hydraulic load actuators connected a test pile cap with a reaction cap. The load actuators incrementally loaded the test cap up to 50 mm of displacement. After each load increment, the displacement was held …
-
Περιβάλλοντα αποθέσεως των ιζημάτων του Πηδάσου (Ν.Δ. Πελοπόννησος)
… and beds to be carried out. The lower beds are sandy and clayey silts interbedded with conglomerate and are probably alluvial fan deposits. Overlying is a sei sequence of marine faciès, mostly deposited in a lagoon. Silty sand and clayey silt were probably built up in lagoonal euxinic bottom. …
-
Marine resistivity as a tool for characterizing groundwater discharge zones at Lake Lacawac, PA
… permeable (10'^ cm/s) fine grained sand; an electrically resistive (-300 Qm), less permeable (lO''* cm/s) silty sand; and an electrically conductive (-150 Qm), hydrologically impermeable (10'^ cm/s) silty clay layer. Although the resistivity measurements could not discriminate …
-
Análise de fundações de máquinas sujeitas a excitações verticais
… research purpose, test results carried out on silty clay soil from Vicksburg (WES) (USA), sandy soils of Eglin (USA) and silty sand from Volta Redonda (BRAZIL) are analysed. The Brazilian soil was of young residual gneiss type. Finally, this work, also, shows design criteria, calculations …
-
Performance of Silty Sands and their Use in Flexible Airfield Pavement Design
… has centred on the performance of clean sands. This is in conflict with actual practice where a wide range of fines and soil gradations could be present in a real-world project. This research investigates the characteristics of natural sands and examines the influence of these marginal …
-
Development of a New Ring Shear Apparatus for Investigating the Critical State of Sands
… study investigates the shearing behavior of sands pertinent to liquefaction and critical state soil mechanics using an improved ring shear apparatus designed and constructed at the University of Illinois. Undrained/constant volume and drained triaxial compression and ring shear tests (sheared …
-
Experimental study of earth pressures on retaining structures
… the results of a series of tests on Monterey sand #0/30. The Instrumented Retaining Wall Facility developed to provide a means of obtaining experimental measurements of the earth pressures exerted on retaining structures is described. The instrumented wall of the facility is seven feet high …
-
Laboratory Performance of Geosynthetic-Stabilized Pavement Sections
… road in Virginia which is constructed over a silty sand subgrade material. Loading of the pavement sections was accomplished through the use of a computer-controlled pneumatic system which delivered 80 lb/in2 (552 kPa) through a rigid plate at a frequency of approximately one-half Hertz. The …
-
Axial load transfer in large scale physical model drilled shaft foundations
… be controlled. Soils tested were a loose clean sand, dense clean sand and compacted silty sand. A bladder system was used to apply vertical effective stress to the soil to simulate depths of embedment up to 70 feet below the ground surface. Based on test results, a relationship between the …
-
Review of the mechanical properties of lunar soils
… size distribution that resembles a well graded silty sand with angular particles and often containing a significant fraction of crushable (hollow) glass spheroids and agglutinates. The soil typically has a specific gravity of 3.1 and is found at an average porosity of approximately 45 - 50 %. …
-
Paleoenvironmental reconstruction of late quaternary lacustrine sediments (Seibold Site) in southeastern North Dakota
… silt; 3) organic mud; 4) calcareous mud; 5) sandy silt and clay; 6) silty sand; and 7) sandy silt and clay.</p> <p>The stratigraphic sequence and biota suggest a 5-phase history for the area during the last 11,000 years. During phase 1 (units 1 and 2, late Wisconsinan) an oligotrophic lake …
-
Physical Performance of Geomembranes Used in Heap Leach Pad Applications
… from underliner material having gravel and sand placed directly beneath the geomembrane and a peak tensile strain of 40% was induced. Increasing the sand fraction to obtain a well graded gravel and sand underliner resulted in peak tensile strains of 14% in the geomembrane and caused no …
-
The sedimentology and palaeoecology of the Coralline Crag (Pliocene) of Suffolk
… Crag is a Pliocene, shallow marine, bioclastic sand formation with an outcrop restricted to south-east Suffolk. Four distinct sedimentary facies have been recognised which indicate that the Coralline Crag was deposited during a single marine transgression. The stratigraphically lowest facies is …
-
Site Response Characteristics of Compacted Gravel Fill in Iceland
… of gravel fill atop dense to very dense silty sand underlain by bedrock shifts the predominant frequency between 10 and 16 Hz with a relative peak amplification between 2.5 and 5.3 times, generally increasing with fill thickness. Fill underlain by undulating lava rock also results in a …
-
Holocene Geology and Migration of a Low-Profile Barrier Island System, Metompkin Island, Virginia
… (11/83 to 11/85) showed significant deficits of sand along northern Metompkin Island and small additions along the southern island segment. Washover was the primary sand source to landward profile segments during recession, supporting the concept of barrier rollover.</p> <p>Sediment deposits of …
-
Refining tsunami inundation limits for the 1700 CE Cascadia earthquake: detailed mapping of fine-grained deposits and diatom biostratigraphy at the Salmon River estuary, central Oregon
… evidence of coseismic subsidence and sandy tsunami deposits preserved in coastal wetlands provide tangible evidence of the 1700 CE Cascadia Subduction Zone (CSZ) earthquake and tsunami. Such evidence has been used to evaluate earthquake source models by comparing simulated tsunami …
-
An experimental and analytic study of earth loads on rigid retaining walls
… were performed with two soils, moist Yatesville silty sand and dry Light Castle sand. Two hand-operated compactors, a vibrating plate compactor and a rammer compactor, were used to compact the backfill. The backfill height was 6.5 feet in all of the tests. Analyses of backfill loads were made …
Page 1 of 2