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.
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Showing 1 to 20 of 50 for “"soil strength"”.
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A procedure for measuring soil strength values in the field
Thesis (M.S.)--Michigan State University. Dept. of Agricultural Engineering, 1964
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A wetland trafficability hazard index based on soil physical properties and site hydrology evaluations
… activities are performed on wetland soils highly susceptible to rutting and puddling. Potential decreases in pine productivity have been connected with increased soil strength and decreased aeration that are commonly remnants of site disturbances associated with wet-weather …
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Soil conditions and early crop growth after repeated manure applications
… on the effects of manure application on soil physical and chemical properties. The objective of this study was to examine the effect of repeated applications of manure on soil physical and chemical properties and to relate those effects to early plant growth and development.Four …
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Tillage effects on soil physical properties, weed seed distribution in soil and shifts in species
… a study on how long-term tillage systems affect soil strength, bulk density, soil water characteristics, weed seed distribution in soil, and shifts in species. The experiment included a corn-soybean rotation with both crop grown each year. For this study, only the corn crop was considered. The …
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Growth and Physiology of Several Urban Tree Species in Soils Disturbed by Construction Fill or Compaction
… to determine the effects of applying fill soil around existing trees and mechanisms for species tolerance to soil compaction, both common site disturbances in urban forestry. Groups of 22-year-old white oak (Quercus alba) and 13-year-old sweetgum (Liquidambar styraciflua) were subjected to …
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Forest Productivity as a Function of Root Growth Opportunity
… are usually complex interactions between soil properties and tree species. We used a 7 by 7 factorial greenhouse experiment to create a matrix of bulk density ((Ï b)) and volumetric water content (θv) to determine soil compaction effects on seedling growth of: (i) ponderosa pine (Pinus …
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The Effects of Prescribed Burning on Soil Water Infiltration Rates and Other Select Soil Physical and Chemical Properties in East Texas
… focused on whether prescribed burning affects soil physical and chemical properties, especially water infiltration, in Western Gulf Coast forests. Soil water infiltration rates were measured 1) pre-burn (before the fire), 2) post-burn (one month after the fire), and 3) at vegetation green-up …
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Understanding plant water relations and root biomechanics for hydro-mechanical reinforcement of slopes
… reinforcement (through transpiration-induced soil matric suction). However, relatively little is known about the effectiveness of different plant species in stabilising soil slopes via the two reinforcing mechanisms, and so decisions on species selection are seldom made with optimisation of …
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New methods for <i>in situ </i>measurement of mechanical root-reinforcement on slopes
… mechanical contribution of roots to the shear strength of the soil is however difficult to measure in situ. Existing methodologies are time-consuming and therefore not suitable to quantify spatial variability on the slope. Furthermore, some existing methods, for example large in situ shear box …
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Land Use and River Systems: Impacts of Suburban Residential Development on Channel Stability and Water Supply, Oak Ridges Moraine, Southern Ontario
… Bolton. Channel morphology was assessed via bank soil strength measurements, vegetation cover, quantification of large woody debris, and visual assessment, allowing for inferences about potential downstream bank degradation symptomatic of streams in urban areas. Hydrology was evaluated using …
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Influência de escavações nos recalques em edificações vizinhas
… movements of the wall, and in this case the soil strength and bracing stiffness are factors of paramount importance.
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Examination of the Correlation between Shear Strength, California Bearing Ratio, and Index Properties of Fine-grained Soil
… Bering Ratio (CBR) is used to evaluate the strength of the pavement materials by comparing bearing capacity of the material with that of a high-quality crushed stone. This test adopted by transportation agencies and widely used in the design and analysis of pavement. Several agencies …
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Ground source heat storage and thermo-physical response of soft clay
… design. However, seasonal heat storage can cause soil temperature fluctuations and possibly deformation of soft clays. This thesis evaluates the thermo-mechanical response of soft clays to seasonal heat storage and associated temperature fluctuations. A literature review reveals that, in normally …
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Finite element analyses of pile load tests performed in the Yorktown formation, Newport News, Virginia
… required for finite element analyses, including: soil sampling and in-situ tests within the Yorktown formation; standard soil laboratory tests for index properties and strength-deformation characteristics of the soil along the pile perimeter and tip, plus interface tests to evaluate soil …
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Impacts of timber harvesting on soil physical properties in wetlands
… Hurricane Hugo in the fall of 1989. High soil moisture conditions during salvage operations resulted in soil compaction and deep rutting (puddling) on primary skid trails. Two studies were established to assess the effects of trafficking on soil physical properties and hydrologic …
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Additive Manufacturing of Soil Using Bio-Cementation
… Calcite Precipitation (MICP) is an emerging soil treatment technique that is proven to increase strength, decrease erosion, reduce liquefaction risk, enhance slope stability, decrease compressibility, decrease swelling potential, and overall create a more competent soil. The benefits and …
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Topdressing and aerification programs on creeping bentgrass fairways
… effect that these two cultural practices have on soil physical properties have not been fully assessed. The first objective of this study was to determine the optimum timing of topdressing and aerification for golf course fairways. The second objective was to determine if varying schedules of …
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Modeling the Behavior of Smart Oil Well Cements and Offshore Pipe-Soil Interaction in Very Soft Soil
… to 50% to investigate the effect on sensing and strength properties. By adding high volume fly ash class C (50%) to the modified oil well cement, fractional change in resistance during compression was doubled compare to specimens without fly ash and also water loss during curing was reduced …
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Urban Landscape Management Practices as Tools for Stormwater Mitigation by Trees and Soils
… designed urban landscapes can employ trees and soils to reduce stormwater runoff flowing to streams and treatment facilities. Typical urban soil, however, is compacted and restricts tree growth via high soil strength and inadequate gas exchange. A site preparation method that deeply incorporates …
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Root responses to soil physical conditions and the role of root-particle contact
… and shoots in relation to matric potential and soil strength in contrasting species. The role of root-particle contact for root and shoot elongation in relation to particle/aggregate size and bulk density at various matric potentials is discussed.<br/><br/>Root and shoot elongation o f maize and …
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