Soil Structure Articles & Analysis
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FLAC3D Soil-structure Model of a Building
A FLAC3D model of a raft foundation, multi-story building was used to assess the possibility of eliminating piles or jet-grouting columns from its initial design in favor of a thicker foundation. This would provide considerable savings in terms of costs, time, and site management. A custom script was developed by HARPACEAS to convert midas GEN structural models into compatible FLAC3D structural ...
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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 ...
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Analysis of edge stresses of plain concrete pavements
The paper focus on analysis carried out for a wide range of load and slab-soil combinations, with an aim to derive unified expression on edge stresses. Edge stresses of plain concrete (PC) slabs-on-grade were computed by finite element methods using three-dimensional (3D) brick and spring elements for slab and soil, respectively. The soil as Winkler type spring model represented by elastic ...
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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 continual displacement of the structure in contact with the soil. The applied normal stress was kept constant during all tests. The influence of the ...
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Bimodal and multimodal descriptions of soil-water characteristic curves for structural soils
In the last decades several approaches have been developed to describe bimodal or multimodal soil-water characteristic curves (SWCCs). Unfortunately, most of these models were derived empirically. In the presented study, physically based bimodal and multimodal SWCC functions have been developed for structural soils. The model involved two or more continual pore series; the probability density ...
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Topsoil properties as affected by tillage systems in the rolling pampa region of Argentina
Improved topsoil structural quality is expected under no-till farming, but soil physical constraints can develop under continuous no-till. Our objectives were: to evaluate the properties of loam, silty loam, and silty clay loam soils under various management practices on a regional scale; to clarify the relationship between soil organic matter pools and soil physical properties; and to find a ...
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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 behavioral change from one specimen to another will vary due to differences in soil structure or aggregation. The shear strength of an unsaturated soil ...
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Rotational and cover crop determinants of soil structural stability and carbon in a potato system
Understanding processes that ameliorate structural degradation in sandy soils is particularly important in intensively managed potato (Solanum tuberosum L.) systems. Seven 2-yr potato rotation systems were evaluated over 3 yr in an irrigated field trial comparing winter management systems bare (B) and cover crops: rye (Secale cereale L.; R), rye-hairy vetch (Vicia villosa Roth; RV) mixture and ...
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Agronomic performance of different pea cultivars under various sowing periods and contrasting soil structures
Yield variability of spring pea (Pisum sativum L.) in farmers' fields is mainly due to soil compaction at sowing and abiotic stresses during the reproductive period. Winter peas flower earlier, and thus should be less sensitive to abiotic stress at the end of the cycle, but because of their sensitivity to frost they must be sown late in autumn when soils are very wet. Pea breeders are working on ...
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Agricultural Use of Different Residual Waste Composts - Current Situation and Experiences in France
ABSTRACT Quality standards have been recently established in France for sewage sludge composts and other urban composts (greenwaste, biowaste and municipal solid waste composts). These standards allow to guarantee the innocuousness of the composts. Other standards have been defined in order to predict the compost effects on soil properties: the index of biological stability (ISB), based on ...
By ORBIT e.V.
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Dynamics of atmospheric nitrogen deposition in a temperate calcareous forest soil
In temperate forest ecosystems, soil acts as a major sink for atmospheric N deposition. A 15N labeling experiment in a hardwood forest on calcareous fluvisol was performed to study the processes involved. Low amounts of ammonium (15NH4+) or nitrate (15NO3–) were added to small plots. Soil samples were taken after periods ranging from 1 h to 1 yr. After 1 d, the litter layer retained approximately ...
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Particle-facilitated pesticide leaching from differently structured soil monoliths
Received for publication September 19, 2008. The leaching of soil particles and surface applied 14C-labeled glyphosate and pendimethalin from intact soil columns (height: 50 cm; diameter: 30 cm) were investigated, and the relative significance of particle-facilitated pesticide transport was quantified. Investigations were performed with a recently plowed (four columns) and an untilled (five ...
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Advantages and precautions of NPK organic fertilizer granulator
The humus in organic fertilizer increases the content of soil organic matter, which is beneficial to the formation of good soil structure, especially the increase of water stable aggregate structure, so as to improve the tightness, aeration, water retention and heat status of soil, and has a good effect on the water, fertilizer, air and heat conditions that determine the soil fertility. It is ...
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Market waste composting in Lima, Peru
The Empresa de Servicios Municipales de Limpieza de Lima (ESMLL and the Pan American Center for Sanitary Engineering and Environmental Sciences (CEPIS) carried out in 1993 a joint research project oriented toward the recovery and use of market waste for compost production to benefit from the wastes generated in Lima.. This pilot project represents an effort aimed at solving the major waste ...
By ORBIT e.V.
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Benefits of minimum tillage case study
In Hungary, the MARGINS project is being conducted near Lake Balaton - the largest lake in Central Europe. The lake is renowned for its beauty and wildlife. Its surrounding hilly landscape is covered with rich brown forest soil. This landscape is, however, prone to soil erosion -in particular, rills develop when soil is weakened by excessive tillage and exposed to intense rainstorms. If not ...
By Syngenta
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Soil compaction, an underestimated problem
Soil compaction is becoming a major issue worldwide. Not only in the Netherlands but globally the soil is deteriorating very badly. Soil compaction is a form of soil degradation, in which the soil structure is lost because the soil is compressed. This global problem is still underestimated and causes problems for agriculture, nature, and climate. Furthermore, soil compaction leads to loss of ...
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Soil Amendment Substances
Soil amendments are the substances that applied to or mixed into the topsoil to improve physical, chemical and biological properties of soil and plant growth. They can improve soil fertility, promote the growth and reproduction of microorganisms in the soil, improve the agricultural productivity of soil and improve the environment for plant growth. Using soil amendment is an important solution ...
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Why Invest in A Manure Separator On Your Farms?
Manure separation is a process that involves dividing raw livestock manure into its solid and liquid components. This separation is typically achieved through mechanical means, such as using specialized equipment like screw press manure separators or sloped screen separators. The process is essential in modern agricultural practices as it allows farmers to manage manure more effectively, extract ...
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Carbon Sequestration Techniques in Agriculture: Harnessing Data for a Sustainable Future
While farming activities have traditionally been associated with greenhouse gas emissions, innovative practices can turn agriculture into a significant carbon sink. This transformation hinges on effective carbon sequestration techniques, which capture and store atmospheric carbon dioxide in soils and plants. Implementing these methods is crucial in our fight against climate change. However, the ...
By Kheti Buddy
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Responses of soil bacterial and fungal communities to reciprocal transfers of soil between adjacent coniferous forest and meadow vegetation in the Cascade Mountains of Oregon
Abstract Little information exists on the responses of soil fungal and bacterial communities in high elevation coniferous forest/open meadow ecosystems of the northwest United States of America to treatments that impact vegetation and soil conditions. An experiment was conducted in which soil cores were reciprocally transplanted between immediately adjacent forests and meadows at two high ...
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