Large-scale laboratory permeability testing of a compacted clay soil

1992 ◽  
Vol 29 (4) ◽  
pp. 221
Keyword(s):  
Large Scale ◽  
Clay Soil ◽  
Compacted Clay

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

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.

Large scale field tests on geogrid-reinforced granular fill underlain by clay soil

2013 ◽  
Vol 38 ◽  
pp. 1-15 ◽  
Author(s):  
Ahmet Demir ◽  
Mustafa Laman ◽  
Abdulazim Yildiz ◽  
Murat Ornek
Keyword(s):  
Large Scale ◽  
Clay Soil ◽  
Field Tests ◽  
Scale Field ◽  
Granular Fill ◽  
Large Scale Field

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 Evaluating Biosedimentation for Strength Improvement in Acidic Soil

2021 ◽  
Vol 11 (22) ◽  
pp. 10817
Author(s):  
Ahmed Hassan Saad ◽  
Haslinda Nahazanan ◽  
Zainuddin Bin Md Yusoff ◽  
Muskhazli Mustafa ◽  
Mohamed Hamdy Elseknidy ◽  
...  
Keyword(s):  
Shear Strength ◽  
Large Scale ◽  
Clay Soil ◽  
Soil Improvement ◽  
Physical Models ◽  
Marine Clay ◽  
Soil Medium ◽  
Treated Soil ◽  
The Stability ◽  
Construction Loads

Marine clay soils are problematic soils in the construction industry when they are subjected to construction loads. When these soils are loaded, they lose their structure. This leads to the soil being unable to withstand loads of any magnitude without exhibiting significant, permanent deformations. In order to stabilize the marine soil, new methods for soil improvement were built upon biogrouting by incorporating physical, biological and chemical treatments into the soil. However, the biggest challenge of this method is the bacteria migration through the soil medium. To overcome this issue, the electrokinetic phenomenon can be utilized alongside biogrouting to prevent the bacteria migration. In this regard, the present study applied electrobiogrouting stabilization to investigate the improvement of acidic marine clay soil with a pH of 3.69. To accomplish this, two large-scale physical models with dimensions of 500 × 300 × 1200 mm were fabricated to examine the influence of two different treated distances between the inlet and outlet—450 mm (D45) and 600 mm (D60)—on the stability of the treated soil. It was observed that the shear strength of the treated soil improved significantly. The shear strength at the D45 treated distance increased from 3.65 kPa (untreated soil) to 28.14 kPa (treated soil). However, the strength increased by increasing the treated distance. In addition, compressibility and soil electrical conductivity were reduced significantly, and the Atterberg limits were significantly enhanced from OH to OL. The reasons for the enhancement of treated soil were the formation of CaCO3, which filled the soil voids, and that the water content was reduced. To address issues with marine clay soil, this study aims to minimize the high cost of a special foundation system and the use of non-environmentally friendly materials such as calcium-based binders, aside from the reduction of deformations caused by loading. The findings of this study can be used for acidic soils and the improvement of soil’s geotechnical behavior in general.

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