scholarly journals Removal rate of compacted clay soil in the batch and continuous reactors and its permeability

2017 ◽  
Vol 3 (5) ◽  
Keyword(s):  
Clay Soil ◽  
Removal Rate ◽  
Compacted Clay

scholarly journals Soil Compaction Methods Development

2018 ◽  
Vol 7 (3.2) ◽  
pp. 636
Author(s):  
Tetyana Lvovska ◽  
Tetyana Lytvynenko ◽  
Alla Kariuk
Keyword(s):  
Soil Compaction ◽  
Clay Soil ◽  
Statistical Processing ◽  
Field Tests ◽  
Water Migration ◽  
Compacted Clay ◽  
Empirical Dependence ◽  
Compaction Test ◽  
Methods Development ◽  
Proctor Test

A process of soil compaction methods development including new authors’ methodology is described. The importance of soil compaction for engineering purposes is substantiated. Preconditions for Proctor compaction test appearance are highlighted. Proctor’s approach and suggestions for the degree of soil compaction assessing are analyzed. Soviet version of Proctor’s equipment and Modified Proctor compaction test are given. Principal differences between Proctor test, Standard compaction test and Modified Proctor test are presented. The problems and disadvantages of existent soil compaction tests are revealed. New authors’ physical experiment methodology for patterns establishment of water migration in subgrade embankment depth, in the capacity factors of what it is accepted: clay soil type (its number plasticity); moisture, at what the soil was compacted; soil skeleton density; embankment height; «rest» time after subgrade erection and before it’s operation is developed and realized. By laboratory and field tests water migration patterns in compacted subgrade soils depth are established. As a result of statistical processing of research results, the empirical dependence of compacted clay soil stabilized moisture is obtained. Empirical dependence parameter corresponds to maximum molecular moisture capacity at what it is advisable to do the subgrade clay soils multilayer consolidation for their long-term strength ensuring. 

Role of Soil Structure and Matric Suction in Collapse of a Compacted Clay Soil

2003 ◽  
Vol 26 (1) ◽  
pp. 9058 ◽  
Author(s):  
L David Suits ◽  
TC Sheahan ◽  
SM Rao ◽  
K Revanasiddappa
Keyword(s):  
Soil Structure ◽  
Clay Soil ◽  
Matric Suction ◽  
Compacted Clay

New Brazilian species of Folsomides Stach (Collembola: Isotomidae)

Zootaxa ◽  
2020 ◽  
Vol 4896 (3) ◽  
pp. 443-450
Author(s):  
MARIA CLEIDE DE MENDONÇA ◽  
ANA CAROLINA DA ROCHA NEVES
Keyword(s):  
New Species ◽  
Rio De Janeiro ◽  
Clay Soil ◽  
Botanical Garden ◽  
Compacted Clay ◽  
Brazilian Species ◽  
Janeiro City

A new blind species, Folsomides cariocus sp. nov., which belongs to the F. parvulus group sensu Fjellberg (1993), is described and illustrated based on material collected in compacted clay soil covered by undergrowth and no litter around the bee nest holes at the Botanical Garden, located in Rio de Janeiro City. The new species is very similar to F. parvulus Stach, 1922 but differs mainly due to the absence of eyes. Synonymies based on ocular variations and pigmented spots were discussed and a table for the group parvulus species is present. 

Some factors affecting compacted clay swelling

1970 ◽  
Vol 7 (1) ◽  
pp. 79-91 ◽  
Author(s):  
A. Yevnin ◽  
D. Zaslavsky
Keyword(s):  
Moisture Content ◽  
Volume Change ◽  
Empirical Equation ◽  
Clay Soil ◽  
Initial Density ◽  
Initial Moisture Content ◽  
Swelling Pressure ◽  
Compacted Clay ◽  
Factors Affecting ◽  
Applied Loading

Volume change after saturation was determined on specimens of a statically compacted clay soil. It was found that density after swelling increases linearly with increasing initial density, initial moisture content, and increasing logarithm of applied loading pressure. An empirical equation with five coefficients and a constant, found with the aid of a computer, represents the results with a coefficient of correlation close to 1. An equation for the swelling pressure was also obtained from this equation. Results of specimens which consolidated did not fit the lines obtained for swelling. The relationships obtained were explained by the influence of particle reorientation and moisture content on swelling tendency.

scholarly journals Modelling the Effects of Nanomaterial Addition on the Permeability of the Compacted Clay Soil Using Machine Learning-Based Flow Resistance Analysis

2021 ◽  
Vol 12 (1) ◽  
pp. 186
Author(s):  
Mehmet Şükrü Özçoban ◽  
Muhammed Erdem Isenkul ◽  
Selçuk Sevgen ◽  
Seren Acarer ◽  
Mertol Tüfekci
Keyword(s):  
Flow Resistance ◽  
Clay Soil ◽  
Oxygen Demand ◽  
Support Vector ◽  
Compacted Clay ◽  
Svm Model ◽  
Highly Correlated ◽  
Kjeldahl Nitrogen ◽  
Soil Changes ◽  
Standard Compaction

Impermeable base layers that are made of materials with low permeability, such as clay soil, are necessary to prevent leachate in landfills from harming the environment. However, over time, the permeability of the clay soil changes. Therefore, to reduce and minimize the risk, the permeability-related characteristics of the base layers must be improved. Thus, this study aims to serve this purpose by experimentally investigating the effects of nanomaterial addition (aluminum oxide, iron oxide) into kaolin samples. The obtained samples are prepared by applying standard compaction, and the permeability of the soil sample is experimentally investigated by passing leachate from the reactors, in which these samples are placed. Therefore, Flow Resistance (FR) analysis is conducted and the obtained results show that the Al additives are more successful than the Fe additive in reducing leachate permeability. Besides, the concentration values of some polluting parameters (Chemical Oxygen Demand (COD), Total Kjeldahl Nitrogen (TKN), and Total Phosphorus (TP)) at the inlet and outlet of the reactors are analyzed. Three different models (Artificial Neural Networks (ANN), Multiple Linear Regression (MLR), Support Vector Machine (SVM)) are applied to the data obtained from the experimental study. The results have shown that polluting parameters produce high FR regression similarity rates (>75%), TKN, TP, and COD features are highly correlated with the FR value (>60%) and the most successful method is found to be the SVM model.

Large-Scale Laboratory Permeability Testing of a Compacted Clay Soil

1991 ◽  
Vol 14 (2) ◽  
pp. 171 ◽  
Author(s):  
PC Knodel ◽  
CD Shackelford ◽  
F Javed
Keyword(s):  
Large Scale ◽  
Clay Soil ◽  
Compacted Clay

Diffusion of inorganic chemical species in compacted clay soil

1989 ◽  
Vol 4 (3) ◽  
pp. 241-273 ◽  
Author(s):  
Charles D. Shackelford ◽  
David E. Daniel ◽  
Howard M. Liljestrand
Keyword(s):  
Clay Soil ◽  
Chemical Species ◽  
Compacted Clay ◽  
Inorganic Chemical

scholarly journals Seismic Response of a Tunnel Embedded in Compacted Clay through Large-Scale Shake Table Testing

2018 ◽  
Vol 2018 ◽  
pp. 1-17
Author(s):  
Hao Zhou ◽  
Xinghua Wang ◽  
Changdi He ◽  
Changxi Huang
Keyword(s):  
Seismic Response ◽  
Large Scale ◽  
Clay Soil ◽  
Shaking Table ◽  
Compacted Clay ◽  
Soil Pressure ◽  
Hoop Strain ◽  
Maximum Acceleration ◽  
Cross Sectional ◽  
Absorbing Layer

To investigate the seismic response of large-scale tunnel in compacted clay and effect of shock absorbing layer to the tunnel, a series of three dimensional (3D) shaking table model tests were carried out. The similarity ratio of the model is 1 : 8 and the size of the model container is 9.3 m (length) × 3.7 m (width) × 2.5 m (height). The cross-sectional diameter of the model tunnel is 0.9 m, and the thickness of the tunnel lining is 0.06 m. To simulate the clay soil surrounding condition, the container was filled with clay soil. During the tests, the concrete strain, acceleration, and dynamic soil pressure on the surface of the model tunnel were measured. The results show the existence of tunnel can decrease the maximum acceleration of the model in the X direction; the shock absorbing layer can further decrease the maximum acceleration, however, cannot change the dominant frequency of the ground motion. The longitudinal and hoop strain of the model tunnel with excitation of the input motion is mainly in tension state and the maximum hoop deformation of the model tunnel is located at the conjugate 45°. In addition, the shock absorbing layer has an effect on the strain and dynamic earth pressure of the model tunnel.

scholarly journals Influence of Backfill Soil Amendments on Establishment of Container-grown Shrubs

1993 ◽  
Vol 3 (2) ◽  
pp. 188-189 ◽  
Author(s):  
Gary W. Watson ◽  
Gary Kupkowski ◽  
Kerstin G. von der Heide-Spravka
Keyword(s):  
Root Growth ◽  
Shoot Growth ◽  
Clay Soil ◽  
Soil Amendments ◽  
Compacted Clay ◽  
Mushroom Compost ◽  
Juniperus Chinensis ◽  
Backfill Soil ◽  
Leaf Compost ◽  
A Site

Cotoneaster apiculata and Juniperus chinensis `Pfitzeriana Compacta' were planted on a site with compacted clay soil. Plants were placed in holes the same size as the root ball (no backfill), or in holes three times the diameter of the root ball with sloping sides. The three backfill soils used were composed of site-soil (50%) amended with sand (40%) and leaf compost (10%), site-soil (75%) amended with mushroom compost (25%), and unamended site-soil. After 14 months, root density was not different in any of the treatments, and root densities were not different in the compacted clay soil outside of the planting hole, indicating that root growth was not inhibited at the interface between the backfill soil and the compacted site clay soil. Shoot growth of C. apiculata grown in backfill amended with sand and leaf compost was larger than shoot growth of plants grown in other backfills.

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