Evaluation of Shear Strength and Cone Penetration Resistance Behavior of Tropical Silt Loam Soil under Uni-Axial Compression

Manuwa, S. I.; Olaiya, Omolola C.

doi:10.4236/ojss.2012.22014

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…In terms of CI, increasing levels of CF contribute to increasing soil resistance to penetration because of skeletal soil stabilization (Manuwa, 2012), and the need to push coarse fragments to the side to gain greater penetration depths. Increasing Sand% generally decreases soil strength,, due to lower particle-to-particle cohesion.…”

Section: General Observations and Trendsmentioning

confidence: 99%

Analyzing and Projecting Soil Moisture and Cone Penetrability Variations in Forest Soils

Jones¹,

Arp²

2019

OJF

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This article details how forest soil moisture content (MC) and subsequent resistances to cone penetration (referred below as Cone Index, CI) vary by daily weather, season, topography, site and soil properties across eleven harvest blocks in northwestern New Brunswick. The MC-and CI-affecting soil variables refer to density, texture, organic matter content, coarse fragment content, and topographic position (i.e., elevation, and the seasonally affected cartographic depth-to-water (DTW) pattern). The harvest blocks were transect-sampled inside and outside their wood-forwarding tracks at varying times throughout the year. In detail, 61% of the pore-filled moisture content (MC PS) determinations inside and outside the tracks could be related to topographic position, coarse fragments, bulk density, and forest cover type specifications. In addition, 40% of the CI variations could be related to soil depth, MC PS , and block-specific cover type. Actual versus model-projected uncertainties amounted to ΔMC PS ≤ ± 15% and ΔCI ≤ ± 0.5 MPa, 8 times out of 10. Block-centered MC and CI projections were obtained through: 1) daily hydrological modelling using daily precipitation and air temperature weather-station records nearest each block, and 2) digitally mapped variations in soil properties, elevation, DTW and forest cover type, done at 10 m resolution.

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Section: General Observations and Trendsmentioning

confidence: 99%

Analyzing and Projecting Soil Moisture and Cone Penetrability Variations in Forest Soils

Jones¹,

Arp²

2019

OJF

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“…The moisture content of above sample was also determined by oven drying method 6 . For determining cone index a cone penetrometer was inserted in field at different locations and at a different profile of soil 7 . Soil cone penetrometer with 30 degree cone apex angle and a flat iron plate of size 70 x 50 mm² was used.…”

Section: Measurement Of Soil Physical Propertiesmentioning

confidence: 99%

Development of Subsoiler Suitable for Chhattisgarh Plain

Kerketta¹

2018

Int. J. Pure App. Biosci.

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Compacted soil hard-pans restrict crop growth by limiting root access to nutrient and moisture in the subsoil. Soil can become deeply compacted in areas tracked by heavy agricultural machineries for primary as well as secondary tillage operation and land management practices. The increased adoption of rotavator among state's farmer results the hardpan formation. Compacted layer typically developed 15-30 cm below the surface where conventional cultivators can't reach. These layer require special equipment called subsoiler and similar chisel/mole plough to fracture them. The objective of this study was to develop an effective subsoiler suitable for Chhattisgarh region that minimized soil disturbance and energy requirements. A subsoiler of 7 cm wide share and operated by 35 hp tractor was developed. The field performance result of subsoiler indicates that it is suitable for operating at 4 km/h forward speed. For achieving 45 cm depth of subsoiling it requires 2.86 meter distance to travel. The subsoiler is suitable for dry and moist soil as the wheel slip was within acceptable limit i.e. around 15 %, field efficiency was more than 80 % and fuel consumption wasless than 4 lit/h. However it was not suitable for wet soil as it results wheel slip of more than 25 %, field efficiency only 66.6 % and fuel consumption 4.70 lit/h. The operating cost of subsoiler was calculated as 427 Rs/ha.

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“…Figure 8 by way of the 3D plots, which reveal moderate CI increase with decreasing MC ps , and a rapid CI increase with increasing CF. In reality, CI and soil strength should decrease again as MC ps drop towards zero as the soil becomes more brittle due to reduced particle-to-particle hydrogen-bonding at low MC [50]. Table 6.…”

Section: Soil Moisture and CI Through Hydrological Modellingmentioning

confidence: 99%

Relating Cone Penetration and Rutting Resistance to Variations in Forest Soil Properties and Daily Moisture Fluctuations

Jones¹,

Arp²

2017

OJSS

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Soil resistance to penetration and rutting depends on variations in soil texture, density and weather-affected changes in moisture content. It is therefore difficult to know when and where off-road traffic could lead to rutting-induced soil disturbances. To establish some of the empirical means needed to enable the "when" and "where" determinations, an effort was made to model the soil resistance to penetration over time for three contrasting forest locations in Fredericton, New Brunswick: a loam and a clay loam on ablation/ basal till, and a sandy loam on alluvium. Measurements were taken manually with a soil moisture probe and a cone penetrometer from spring to fall at weekly intervals. Soil moisture was measured at 7.5 cm soil depth, and modelled at 15, 30, 45 and 60 cm depth using the Forest Hydrology Model (ForHyM). Cone penetration in the form of the cone index (CI) was determined at the same depths. These determinations were not only correlated with measured soil moisture but were also affected by soil density (or pore space), texture, and coarse fragment and organic matter content (R 2 = 0.54; all locations and soil depths). The resulting regression-derived CI model was used to emulate how CI would generally change at each of the three locations based on daily weather records for rain, snow, and air temperature. This was done through location-initialized and calibrated hydrological and geospatial modelling. For practical interpretation purposes, the resulting CI projections were transformed into rut-depth estimates regarding multi-pass off-road all-terrain vehicle traffic.

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Evaluation of Shear Strength and Cone Penetration Resistance Behavior of Tropical Silt Loam Soil under Uni-Axial Compression

Cited by 9 publications

References 12 publications

Analyzing and Projecting Soil Moisture and Cone Penetrability Variations in Forest Soils

Analyzing and Projecting Soil Moisture and Cone Penetrability Variations in Forest Soils

Development of Subsoiler Suitable for Chhattisgarh Plain

Relating Cone Penetration and Rutting Resistance to Variations in Forest Soil Properties and Daily Moisture Fluctuations

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