scholarly journals Compaction of water-saturated soil by surface vacuuming

2018 ◽  
Vol 196 ◽  
pp. 03006 ◽  
Author(s):  
Lyudmila Cherkasova
Keyword(s):  
Surface Area ◽  
Saturated Soil ◽  
Saturated Soils ◽  
Laboratory Studies ◽  
Compression Tests ◽  
The Press ◽  
Soil Venting ◽  
Similarities And Differences ◽  
Equivalent Load ◽  
Water Saturated

The results of laboratory studies of compaction of weak water-saturated soils using surface vacuuming are presented. Experiments on the compaction of water-saturated peat by the method of surface vacuuming under the screens were carried out on a special installation. The vacuum was created under round sealed screens of different sizes and stiffness. As the results of the experiments showed, the mechanism of compaction of weak water-saturated soils during vacuuming from the surface under the protection of a sealed coating is determined by the action of volumetric filtration forces. When vacuuming, in contrast to the compaction load, there is no soil venting around the perimeter of the compacted surface area, which significantly increases the efficiency of this method. And the use of flexible screens (geo-membrane) opens up opportunities for construction. A series of compression tests was carried out to identify the similarities and differences in the consolidation processes when compacting different materials by vacuuming and equivalent load created by the press.

Comparison Of Field And Laboratory Studies Results Of The Clay Soils Deformability Characteristics

2019 ◽  
pp. 40-45
Keyword(s):  
Low Cost ◽  
Field Studies ◽  
Field Conditions ◽  
Clay Soils ◽  
Saturated Soils ◽  
Natural Occurrence ◽  
Laboratory Studies ◽  
Load Tests ◽  
Definition Of ◽  
Water Saturated

Determination of the deformability characteristics of weak water-saturated soils is a complex process. Firstly, it is difficult to preserve the natural structure of the soil sample taken for the study in the laboratory. Secondly, according to the latest studies, in natural occurrence there is a constant pore pressure, which must be taken into account when determining the characteristics of deformability and strength of clay soils. During many years it was established that the compressibility characteristic of soils obtained under laboratory conditions differs sharply from the result of characterization in field conditions. It is proposed to use the characteristics of compressibility and strength of soils obtained in the course of low-cost laboratory studies, compared with the definition of these characteristics in expensive field conditions. The results of the comparison of numerous laboratory and field studies of the properties of weak water-saturated soils of the base of various regions of Russia are presented. On the basis of the data obtained, when studying the characteristics of deformability of weak water-saturated clay soils, it is recommended to use only laboratory methods and not to conduct additional field plate load tests, except in the case of construction of unique structures,

scholarly journals Experimental studies on the transformation from firn to ice in the wet-snow zone of temperate glaciers

1997 ◽  
Vol 24 ◽  
pp. 181-185 ◽  
Author(s):  
Katsuhisa Kawashima ◽  
Tomomi Yamada
Keyword(s):  
Experimental Studies ◽  
Ice Formation ◽  
Compression Tests ◽  
Densification Rate ◽  
Overburden Pressure ◽  
Proportionality Constant ◽  
Wet Snow ◽  
Water Saturated ◽  
The Relationship ◽  
Good Agreement

The densification of water-saturated firn, which had formed just above the firn-ice transition in the wet-snow zone of temperate glaciers, was investigated by compression tests under pressures ranging from 0.036 to 0.173 MPa, with special reference to the relationship between densification rate, time and pressure. At each test, the logarithm of the densification rate was proportional to the logarithm of the time, and its proportionality constant increased exponentially with increasing pressure. The time necessary for ice formation in the firn aquifer was calculated using the empirical formula obtained from the tests. Consequently, the necessary time decreased exponentially as the pressure increased, which shows that the transformation from firn in ice can be completed within the period when the firn aquifer exists, if the overburden pressure acting on the water-saturated firn is above 0.12–0.14 MPa. This critical value of pressure was in good agreement with the overburden pressure obtained from depth–density curves of temperate glaciers. It was concluded that the depth of firn–ice transition was self-balanced by the overburden pressure to result in the concentration between 20 and 30 m.

Modeling Competitive Cation Exchange of Aromatic Amines in Water-Saturated Soils

2001 ◽  
Vol 35 (13) ◽  
pp. 2727-2733 ◽  
Author(s):  
José R. Fábrega ◽  
Chad T. Jafvert ◽  
Hui Li ◽  
Linda S. Lee
Keyword(s):  
Cation Exchange ◽  
Aromatic Amines ◽  
Saturated Soils ◽  
Water Saturated

Lateral Earth Pressure Coefficient of Soils Subjected to Freeze–Thaw

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
Xiaodong Zhao ◽  
Guoqing Zhou ◽  
Bo Wang ◽  
Wei Jiao ◽  
Jing Yu
Keyword(s):  
Pressure Coefficient ◽  
Earth Pressure ◽  
Retaining Walls ◽  
Saturated Soil ◽  
Frozen Soils ◽  
Freeze Thaw ◽  
Lateral Earth Pressure ◽  
Soil Deposits ◽  
Earth Pressure Coefficient ◽  
Water Saturated

Artificial frozen soils (AFS) have been used widely as temporary retaining walls in strata with soft and water-saturated soil deposits. After excavations, frozen soils thaw, and the lateral earth pressure penetrates through the soils subjected to freeze–thaw, and acts on man-made facilities. Therefore, it is important to investigate the lateral pressure (coefficient) responses of soils subjected to freeze–thaw to perform structure calculations and stability assessments of man-made facilities. A cubical testing apparatus was developed, and tests were performed on susceptible soils under conditions of freezing to a stable thermal gradient and then thawing with a uniform temperature (Fnonuni–Tuni). The experimental results indicated a lack of notable anisotropy for the maximum lateral preconsolidated pressures induced by the specimen’s compaction and freeze–thaw. However, the freeze–thaw led to a decrement of lateral earth pressure coefficient  K0, and  K0 decrement under the horizontal Fnonuni–Tuni was greater than that under the vertical Fnonuni–Tuni. The measured  K0 for normally consolidated and over-consolidated soil specimens exhibited anisotropic characteristics under the vertical Fnonuni–Tuni and horizontal Fnonuni–Tuni treatments. The anisotropies of  K0 under the horizontal Fnonuni–Tuni were greater than that under the vertical Fnonuni–Tuni, and the anisotropies were more noticeable in the unloading path than that in the loading path. These observations have potential significances to the economical and practical design of permanent retaining walls in soft and water-saturated soil deposits.

Heat Exchange Between a Tube and Water-Saturated Soil

1986 ◽  
Vol 108 (4) ◽  
pp. 298-302 ◽  
Author(s):  
C. A. van der Star ◽  
G. A. M. van Meurs ◽  
C. J. Hoogendoorn
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Thermal Properties ◽  
Saturated Soil ◽  
Mutual Distance ◽  
Tube Material ◽  
Surrounding Water ◽  
Analytical Approximations ◽  
Water Saturated ◽  
Regional Groundwater

The heat transfer between a cylinder and the surrounding water-saturated soil is studied numerically. Parameters which influence this heat transfer are thermal properties of the soil, dimension and thermal conductivity of the tube material, and a regional groundwater flow. The results are compared to analytical approximations. When two tubes are present, their mutual distance is also such a parameter.

scholarly journals EXPERIENCE OF TRANSFORMATION OF WEAK WATER-SATURATED SOILS USING PILES OF FINITE STIFFNESS

Vestnik MGSU ◽  
2018 ◽  
pp. 271-281
Author(s):  
V. V. Sidorov ◽  
Z. G. Ter-Martirosyan ◽  
A. Z. Ter-Martirosyan
Keyword(s):  
Saturated Soils ◽  
Water Saturated

scholarly journals Vertical Impedance of Rigid Shallow Foundation on Layered Water-Saturated Soil

2019 ◽  
pp. 165-167
Author(s):  
Oleksandr Trofymchuk ◽  
Oleh Savytskyi
Keyword(s):  
Numerical Analysis ◽  
Oscillation Frequency ◽  
Saturated Soil ◽  
Shallow Foundation ◽  
Mechanical Parameters ◽  
Lower Edge ◽  
Rigid Plate ◽  
Water Saturated ◽  
Impedance Functions ◽  
Biot’S Model

Methods have been developed for numerical analysis the vertical oscillations of rigid plate with a liquidimpermeable sole rested on the layer (Biot’s model) with a rigidly restrained lower edge. The plate sole is liquid-impermeable. The analysis of the impedance functions depending on the oscillation frequency, the geometry of the system and the mechanical parameters of the soil model is carried out.

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