scholarly journals Modeling heat transfer process in soils

2018 ◽  
Vol 251 ◽  
pp. 02048 ◽  
Author(s):  
Ian Ofrikhter ◽  
Alexander Zaharov ◽  
Andrey Ponomaryov ◽  
Natalia Likhacheva
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Thermal Conductivity ◽  
Analytical Calculation ◽  
Accurate Method ◽  
Heat Transfer Process ◽  
Preliminary Evaluation ◽  
Soil Base ◽  
Undisturbed Sample ◽  
Analytical Formulas

In this paper, a new model is presented for calculating the thermal conductivity of soils, and the main provisions for the derivation of analytical formulas are given. The presented model allows taking into account the density, moisture content and temperature of the soil base. The technique presented in the paper makes it possible to dispense with laborious experiments to estimate the thermal conductivity of the soil. The method of analytical calculation is step by step presented in the paper. Two variants of using the method are proposed: 1) Less accurate method, for preliminary evaluation, without the need to take probe and conduct experiments. 2) More accurate method, with at least one experiment with a disturbed or undisturbed sample. The results of comparison of calculated values of thermal conductivity and experimental data are presented.

A New Type of Muddy Sediment Undisturbed Gravity Sampler in Shallow Waters

2013 ◽  
Vol 431 ◽  
pp. 151-154
Author(s):  
Qing Peng Kong ◽  
Qiao Di Zhou ◽  
Qing Hua Sheng
Keyword(s):  
Shallow Waters ◽  
Light Weight ◽  
Muddy Sediment ◽  
Deformation Method ◽  
True Nature ◽  
Membrane Deformation ◽  
Sediment Records ◽  
Undisturbed Sample ◽  
New Type

Muddy sediment records environmental change information water experienced. Due to the sampling disturbance, parameters provided by sediment analysis can't truly reflect the true nature of in situ sediment and water environmental information. This paper introduces a kind of muddy sediment undisturbed gravity sampler used in shallow waters, through a unique rubber sealing membrane deformation method. The sampler proved to be an effective tool of muddy sediment undisturbed sample in shallow waters, with characteristics of light weight, easy to carry, and convenient operation.

scholarly journals Quality evaluation of undisturbed sample taken from seabed in Tokyo Bay based on various strength tests

2017 ◽  
Vol 12 (1) ◽  
pp. 135-149
Author(s):  
Takashi TSUCHIDA ◽  
Takatoshi NOGUCHI ◽  
Yoichi WATABE
Keyword(s):  
Quality Evaluation ◽  
Tokyo Bay ◽  
Strength Tests ◽  
Undisturbed Sample

scholarly journals Shear Strength of Undisturbed Sample of Decomposed Granite Soil

1976 ◽  
Vol 16 (1) ◽  
pp. 17-26 ◽  
Author(s):  
Toru Onodera ◽  
Masanobu Oda ◽  
Kazumi Minami
Keyword(s):  
Shear Strength ◽  
Undisturbed Sample ◽  
Decomposed Granite ◽  
Granite Soil

scholarly journals Segregation Peat Fiber and Pre- Consolidation Pressure Effect on the Physical Properties of Reconstituted Peat Soil

2019 ◽  
Vol 8 (6S3) ◽  
pp. 640-647
Keyword(s):  
Physical Properties ◽  
Pressure Effect ◽  
Peat Soil ◽  
Organic Content ◽  
Liquid Limit ◽  
Peat Soils ◽  
Consolidation Pressure ◽  
Peat Sample ◽  
Undisturbed Sample ◽  
Effect Method

The preparation of the undisturbed peat sample at the site must be conducted to understand its characteristics. However, the sampling process becoming difficult due to the condition of peat soils itself. Due to the limitation in gaining undisturbed sample, a study on reconstitution sample becoming more popular in term of investigating the properties of soil that represent the real site condition. The main purpose of this paper was to investigate the physical properties of undisturbed and reconstituted peat RS3.350, RS2.360, RS1.000 and RS0.425. In this study, the segregation of peat and expulsion water with the aids pre-consolidation pressure was applied to the reconstituted sample. The range value of the physical properties of reconstituted peat was varied from each type of peat classification which affected by the segregation fiber and pre-consolidation pressure effect method. The entire reconstituted peat samples were recons passing the opening sieve size 3.350mm, 2.360mm, 1.000mm and 0.425 mm and were subjected with the 50 kPa, 80 kPa and 100 kPa pre-consolidation pressures. As a result, the natural Parit Nipah peat soil was classified as hemic peat (H5). The percentage of water content, liquid limit, organic content and fiber content for the reconstituted sample is lower compared to the undisturbed peat sample; but differed from specific gravity where the percentage for the reconstituted sample was higher than the undisturbed sample. Conclusively, the segregation of peat fiber and pre-consolidation pressure methods greatly affect and change the physical properties of peat samples.

scholarly journals Evaluation of selected physical properties of soil in the vineyard

2011 ◽  
Vol 59 (1) ◽  
pp. 269-276
Author(s):  
Pavel Zemánek ◽  
Milan Michálek
Keyword(s):  
Czech Republic ◽  
Physical Properties ◽  
Penetration Resistance ◽  
Critical Limit ◽  
Soil Cultivation ◽  
Production Processes ◽  
Undisturbed Sample ◽  
Soil Compression ◽  
South Moravia ◽  
Properties Of Soil

There is registered approximately 18 000 ha of intensive vineyards in this time in Czech Republic. The intensive viticulture production is represented by high amount of working operations which are practised by using of mechanization. Frequency of passages by mechanization in interrow of descent is different by single variants of production processes. Their currently number varies about 20–25 per season. The soil compression is the highest in wheels tracked lines and middle of the interrow. If the compaction reaches over the critical limit, it can be this state escorted by weighty incidence (decrease of decree, increasing by power severity by soil cultivation and other). These contributions deal with analysis of soil compression in different areas in the region of the South Moravia. The used methods were undisturbed sample and penetration resistance with using of penetrometer.

scholarly journals The Analysis of Slope Safety Factors at Post Mining Areas in Semaya Village, Randudongkal Sub-district, Pemalang

PROMINE ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 20-27
Author(s):  
Rinal Khaidar Ali ◽  
Najib Najib ◽  
Adam Kahfi Mulyadi
Keyword(s):  
Safety Factor ◽  
Direct Shear Test ◽  
Shear Test ◽  
Mining Area ◽  
Mining Activities ◽  
Direct Shear ◽  
Safety Factors ◽  
Mining Areas ◽  
Limit Test ◽  
Undisturbed Sample

Mining activities has become increasingly widespread in recent years, especially people’s mining, thatjust concerned about the result and not paying attention to the environmental factors.This is causedthe post mining area’s destruction and environmental degradation potential. For this reason, the slopesafety factor enhancement analysis on the post mining area in Semaya Village, Randudongkal Sub-District, Pemalang Regency is needed. Slope stability analysis using Slide 6.0 software to identify thecondition of post mining area from the results of undisturbed sample (UDS) laboratory data.Laboratory testing includes several aspects including water content, weight, specific gravity, grain size,atteberg limit test, and direct shear test. The value of the safety factor is 1,441, the value is in the safecategory because it passes the minimum value limit of the safety factor which is 1.25, this result isobtained from the terracing modeling.

scholarly journals Erosion processes in black marl soils at the millimetre scale: preliminary insights from an analogous model

2015 ◽  
Vol 19 (4) ◽  
pp. 1849-1855 ◽  
Author(s):  
J. Bechet ◽  
J. Duc ◽  
M. Jaboyedoff ◽  
A. Loye ◽  
N. Mathys
Keyword(s):  
Slope Angle ◽  
Laser Scanner ◽  
Surface Processes ◽  
Infiltration Rates ◽  
Erosion Processes ◽  
Natural Rainfall ◽  
Undisturbed Sample ◽  
Analogous Model ◽  
Micro Topography ◽  
Scale Surface

Abstract. To investigate the millimetre-scale surface processes caused by natural rainfall, an undisturbed sample of badlands soil (1 m long, 0.5 m wide and 0.15 m thick) was carefully extracted. The sample is composed of black marl soil from a badlands area of the Draix Observatory (SE France). After extraction, the undisturbed sample was placed at the same slope angle (45°) as its original orientation and was then monitored for several processes via a terrestrial laser scanner (TLS) with millimetre-scale accuracy and resolution. This experiment identified several surface processes interpreted as micro-landslides, swelling of the black marl material and lateral expansion that closed desiccation cracks. These micro-processes illustrate the complexity of the surface micro-topography changes that control erosion and infiltration rates over time.

scholarly journals Can Soil Penetration Resistance and Bulk Density Be Determined in a Single Undisturbed Sample?

2015 ◽  
Vol 39 (3) ◽  
pp. 763-766
Author(s):  
Carolina Fernandes ◽  
Roniram Pereira da Silva ◽  
Adolfo Valente Marcelo
Keyword(s):  
Bulk Density ◽  
Clayey Soil ◽  
Soil Layer ◽  
Penetration Resistance ◽  
Clayey Soils ◽  
Undisturbed Soil ◽  
Soil Penetration Resistance ◽  
Undisturbed Sample ◽  
Randomized Experimental Design ◽  
Density Values

Soil quality indicators such as penetration resistance (PR) and bulk density (BD) are traditionally determined in a single undisturbed soil sample. The aim of this study was to assess the effect of PR measurements of undisturbed samples on the determination of BD in the same sample of two soils differing in clay contents. To this end, samples were collected from the 0.00-0.10 and 0.10-0.20 m layers of two soils of clayey and very clayey texture. Volumetric rings were used to collect a total of 120 undisturbed soil samples from each soil layer that were divided into two subsets containing 60 units each. One sample set, designated “perforated samples”, was used to determine PR and BD in the same undisturbed sample; the other, named “intact samples”, was used to determine BD only. Bulk density values for perforated and intact samples were compared by analysis of variance, using a completely randomized experimental design. Means were compared by the t-test at 5 %. The BD values for the clayey soil were similar in perforated and intact samples from the two layers. However, BD of the very clayey soil was lower in the perforated than in the intact samples at both depths. Therefore, PR and BD in clayey soils can be accurately determined in the same undisturbed sample whereas in very clayey soils, different samples are required for this purpose.

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