scholarly journals RESEARCH OF DEFORMATION OF CLAY SOIL MIXTURES MIXTURES / MOLINIŲ GRUNTŲ MIŠINIŲ DEFORMACIJŲ TYRIMAS

2014 ◽  
Vol 6 (5) ◽  
pp. 488-492 ◽  
Author(s):  
Romas Girkontas ◽  
Tadas Tamošiūnas ◽  
Andrius Savickas
Keyword(s):  
Bearing Capacity ◽  
Failure Mode ◽  
Civil Engineering ◽  
Clay Soil ◽  
Scientific Research ◽  
Clay Soils ◽  
Research Center ◽  
Technology Application ◽  
Drying Technology ◽  
Bridge Bearing

The aim of this article is to determine clay soils and clay soils mixtures deformations during drying. Experiments consisted from: a) clay and clay mixtures bridges (height ~ 0,30 m, span ~ 1,00 m); b) tiles of clay and clay, sand and straw (height, length, wide); c) cylinders of clay; clay and straw; clay, straw and sand (diameter; height). According to the findings recommendations for clay and clay mixtures drying technology application were presented. During the experiment clay bridge bearing capacity and failure mode were determined. For investigations Vilnius Gediminas Technical University Civil Engineering Scientific Research Center infrastructure was used. Tyrimo tikslas – nustatyti molinio grunto mišinių džiūvant atsirandančias deformacijas. Eksperimentams buvo naudojama: a) moliniai ir molio mišinių tiltai (aukštis ~0,30 m, tarpatramis ~1,00 m, plotis 0,07–0,1 m); b) plytelės iš molio; molio, smėlio ir šiaudų (l; b; h); c) cilindrai iš molio; molio ir šiaudų; molio, šiaudų, smėlio (d; h). Pagal gautus bandymo rezultatus pateiktos rekomendacijos molinių gruntų mišinių džiovinimo technologijai taikyti. Nustatyta molinių tiltų laikomoji galia ir suirimo pobūdis. Atliekant tyrimus buvo pasinaudota Vilniaus Gedimino technikos universiteto Civilinės inžinerijos mokslo centro MTEP infrastruktūra.

A scaled-up Seinhorst elutriator for extraction of cyst nematodes from soil

Nematology ◽  
2007 ◽  
Vol 9 (3) ◽  
pp. 431-435 ◽  
Author(s):  
Thomas Been ◽  
Thea van Beers ◽  
Petra van Bekkum ◽  
Annelies Beniers
Keyword(s):  
Sandy Soil ◽  
Clay Soil ◽  
Scientific Research ◽  
Soil Samples ◽  
Clay Soils ◽  
Potato Cyst Nematodes ◽  
Cyst Nematodes ◽  
Marine Clay ◽  
Flow Meter ◽  
Large Soil

AbstractIn order to process large soil samples containing potato cyst nematodes, the Seinhorst (1964) cyst elutriator was scaled up to process both sandy and marine-clay soils in batches of up to 2.5 kg. Several modifications were implemented. To maintain the required upward current of 3.01 min−1, an inflow of 8.01 min−1 was necessary in the enlarged, 7.5 cm diam. sedimentation tube. Also water inflow is now regulated using a flow meter with pressuriser. Several experiments were undertaken, using artificial sandy soil and marine-clay soil, both naturally infested with potato cyst nematodes. In the final experiment, using the 8.01 min−1 inflow for 4 min, there was a loss of 0.65% and 0.74% of cysts, and eggs and juveniles, respectively. This indicates that the yield (99%) of the scaled-up elutriator matches that of the original Seinhorst elutriator and, therefore, is suitable for statutory and scientific research.

scholarly journals BEARING CAPACITY OF FOLDED PLATE FOUNDATIONS IN CLAY SOIL

2021 ◽  
pp. 1-7
Author(s):  
Ratna Dewi ◽  
Yakni Idris ◽  
Yulindasari Sutejo ◽  
Said Agil Al Munawar
Keyword(s):  
Bearing Capacity ◽  
Flat Plate ◽  
Ultimate Load ◽  
Clay Soil ◽  
Clay Soils ◽  
Tangent Method ◽  
Optimum Variation

The design of a foundation is inseparable from the type and strength of the soil, for example, clay soils have poor properties for structures due to their low bearing capacity. Therefore, it is necessary to modify the model of a foundation to increase its bearing capacity and one of the popular methods is the application of folded plate on a flat foundation with angles and flange lengths on both sides. Therefore, this research presented its application at different flange lengths of 0.5B, 0.75B, 1B, 1.25B, and 1.5B where B is the width of the flat plate and the results showed the bearing capacity of the folded plate was higher than the flat foundation. Moreover, an increment in the folded length led to a bigger ultimate load and smaller settlement but the ultimate load and settlement were observed to be almost constant at over 1B. This means the optimum variation where the flange length is equal to the foundation width is 1B and it was observed to have increased by 129.52 % using the Tangent Method and 148.4 7% with Butler Hoy Method. Meanwhile, the lowest settlement factor for the folded plate foundation was 0.22 with the highest bearing capacity of 61.19 kN/m2

scholarly journals Effect of Urease Enzyme on Shear Strength of Clay Shale

2018 ◽  
Vol 7 (4.36) ◽  
pp. 424 ◽  
Author(s):  
Maxwel Joseph Henri Nainggolan ◽  
Wiwik Rahayu ◽  
Puspita Lisdiyanti
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Triaxial Test ◽  
Clay Soil ◽  
Soil Strength ◽  
Clay Shale ◽  
Strength Performance ◽  
Enzyme Mixture ◽  
Urease Enzyme

In recent years, utilization of biotechnology in geotechnical field has rapidly grown. One of the biotechnologies being utilized is urease enzyme, a stabilization material by bio-cementation method studied in this research.  Urease enzyme is manually mixed with additional 10% of clay soil to clay shale. The objective of mixing it is to increase the bearing capacity of the clay shale. Consolidated undrained triaxial test was performed for testing the soil strength performance for samples that had undergone curing for 2, 4, and 6 weeks. The results indicated that the sample stiffens, proved by the increase of shear strength from consolidated undrained triaxial test. The shear strength value produced by the variation of the urease enzyme mixture + 10% the clay is higher than that of without the original clay shale.  

Bearing capacity on sand overlying clay soils: a simplified conceptual model

Géotechnique ◽  
2013 ◽  
Vol 63 (15) ◽  
pp. 1285-1297 ◽  
Author(s):  
K.K. LEE ◽  
M.F. RANDOLPH ◽  
M.J. CASSIDY
Keyword(s):  
Bearing Capacity ◽  
Conceptual Model ◽  
Clay Soils

Experimental Study about Bearing Capacity and Deformation on Concrete Composite Slabs with Additional Bars

2013 ◽  
Vol 482 ◽  
pp. 7-10
Author(s):  
Jian Hua Cui ◽  
Chuan Yang Weng ◽  
Yun Lin Liu
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Failure Mode ◽  
Static Loading ◽  
Flexural Behavior ◽  
Flexural Properties ◽  
Effective Height ◽  
Composite Slabs

Through the experiments of four concrete composite slabs under static loading to compare their flexural properties (deflection, bearing capacity, failure mode), this paper discusses the influence of composite slabs flexural behavior on different length of additional bars and sectional effective height. The results showed that they will improve the bearing capacity effectively by reasonably increasing the sectional effective height and controlling the length of additional bars.

Physico-chemical parameters of the best varieties of peach in the subtropics of Russia

2021 ◽  
Author(s):  
Yu.S. Abilfazova ◽  
Keyword(s):  
Scientific Research ◽  
Stress Factors ◽  
Research Center ◽  
Chemical Parameters ◽  
Subtropical Zone ◽  
Russian Academy Of Sciences ◽  
Federal Research ◽  
Physico Chemical ◽  
Resistance To Stress ◽  
Academy Of Sciences

the characteristic the best varieties peach plants cultivated in the subtropical zone Krasnodar Territory is given. The study collection plantations peach in the subtropical zone Krasnodar Territory has been carried out since 2009 at the Federal Research Center Scientific Research Center of the Russian Academy of Sciences. The results of many years of research have identified the best peach varieties (Redhaven, Favorita Morettini, Larisa, Medin red, Veteran, Fayet), distinguished by resistance to stress factors and high palatability of the fruits.

scholarly journals Steel Plate Cold-Rolled Section Steel Embedded High-Strength Concrete Low-Rise Shear Wall Seismic Performance

2018 ◽  
Vol 2018 ◽  
pp. 1-18
Author(s):  
Min Gan ◽  
Yu Yu ◽  
Liren Li ◽  
Xisheng Lu
Keyword(s):  
Bearing Capacity ◽  
Failure Mode ◽  
Seismic Performance ◽  
High Strength Concrete ◽  
Steel Plate ◽  
Shear Walls ◽  
High Strength ◽  
Shear Wall ◽  
Steel Plates ◽  
Strength Concrete

Four test pieces with different steel plate center-to-center distances and reinforcement ratios are subjected to low-cycle repeat quasistatic loading to optimize properties as failure mode, hysteretic curve, skeleton curve, energy dissipation parameters, strength parameters, and seismic performance of high-strength concrete low-rise shear walls. The embedded steel plates are shown to effectively restrict wall crack propagation, enhance the overall steel ratio, and improve the failure mode of the wall while reducing the degree of brittle failure. Under the same conditions, increasing the spacing between the steel plates in the steel plate concrete shear wall can effectively preserve the horizontal bearing capacity of the shear wall under an ultimate load. The embedded steel plates perform better than concealed bracing in delaying stiffness degeneration in the low-rise shear walls, thus safeguarding their long-term bearing capacity. The results presented here may provide a workable basis for shear wall design optimization.

scholarly journals Licorice (Glycyrrhiza glabra (Linnaeus, 1753)) roots aqueous extract and some additives against Bactrocera zonata (Saunders, 1841) (Diptera: Tephritidae)

2021 ◽  
Vol 90 (2 - Ahead of print) ◽  
pp. 70-85
Author(s):  
Mervat Abdel-Moneauim Mostafa El-Genaidy ◽  
Mohamed Abd El-Aziz Mohamed Hindy ◽  
Nehad Abdel-Hameed Soliman
Keyword(s):  
Aqueous Extract ◽  
Sandy Soil ◽  
Clay Soil ◽  
Mineral Oil ◽  
Glycyrrhiza Glabra ◽  
Clay Soils ◽  
Insecticidal Effect ◽  
Bactrocera Zonata ◽  
Light Mineral ◽  
Petroleum Oil

Peach fruit fly, Bactrocera zonata (Saunders, 1841) is a destructive polyphagous pest threatening the horticultural production in Egypt. Licorice, Glycyrrhiza glabra (Linnaeus, 1753) is a plant growing in Egypt and many other countries and famous for saponins groups that have insecticidal effect against broad spectrum of insect pests. In the present study, the insecticidal effect of licorice roots aqueous extract (LRAE), petroleum oil, KZ light mineral oil 96% (EC), water and an emulsion (1/4 L LRAE + ¼ L petroleum oil + ½ L KZ light oil 96% (EC)) treatments in a ratio 1 L: 29 L water were used in Matabi® sprayer of 30 L capacity against B. zonata pupae in sandy and clay soils. In sandy and clay soils LRAE reduced B. zonata population by 74.44% and 87.55% while petroleum oil, KZ light mineral oil 96% (EC) prevented flies emergence (100% reduction). Water treatment suppressed B. zonata population by 78.61% in sandy soil but caused 100% population reduction in clay soil. The emulsion reduced B. zonata population by 96.94% in sandy soil and 100% in clay soil. The best method for application of the emulsion was to spray as one target spray technique for eight seconds that was sufficient to obtain suitable coverage on soil with spray speed 1.2 km / hour. The persistence of the emulsion that highly reduced B. zonata larval populations was 3.5 and 4.5 days in sandy and clay soils, respectively. The flies emerged from B. zonata pupae treated with the emulsion neither feed nor move naturally. The histological studies showed that these flies suffered changes in the eyes, labellum, muscles and midgut tissues that were different from the emerged control treatment flies.

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