Design of Tunnels in Swelling Soils: Determination of Swelling Soil Properties

2002 ◽  
Author(s):  
Timothe´e Windal ◽  
Isam Shahrour
Keyword(s):  
Soil Properties ◽  
Soil Sample ◽  
Lateral Deformation ◽  
Swelling Soils ◽  
Swelling Soil ◽  
Swell Pressure

This paper includes a study of soil swelling for tunnels projects. It is performed using a flexible odometer which authorizes a lateral deformation of the soil sample during swelling and allows the measurement of the lateral swell pressure. The paper is composed of three parts. The first one concerns analysis of swelling phenomenon in tunnel projects. The second one presents the swelling odometer which was used in this work. The last one presents results obtained on clay and discusses the influence of the swelling condition on both axial and lateral soils expansion.

scholarly journals Experimental Testing and Numerical Simulations for Typical Swelling Soil in Egypt

2019 ◽  
Vol 8 (3) ◽  
pp. 4101-4111
Keyword(s):  
Experimental Testing ◽  
Experimental Tests ◽  
Soil Samples ◽  
Test Facility ◽  
Testing Program ◽  
Swelling Soils ◽  
Urban Regions ◽  
Finite Element Software ◽  
Swelling Soil

swelling soils exist in many developing urban regions in egypt. Most of these urban regions have new huge developments under constructions. The structures constructed on these swelling soils may be exposed to high damage if any significant change in the moisture content of these swelling soils occures, so the presence of such swelling soils represents a significant hazard. Investigation the behaviour of these swelling soils as well as determination of their swelling parameters has become highly necessary. In this paper, intensive experimental testing program has been conducted on some soil samples collected from some of these regions to determine their swelling parameters. Through this experimental testing program, oedometer swell test has been firstly conducted on same soil with two different techniques; namely different pressure method and huder-amberg method. The procedures and obtained results of the two used methods are discussed and compared showing advantages and shortages of each method. After that, all subsequent experimental tests were perfomred using huderamberg method as it demonstrated high superiority in determining swelling parameters. Grob’s 1d swelling law was applied to all obtained experimental results to give exact and complete determination for all swelling parameters. Furthermore, swelling soil has been simulated numerically via the new userdefined swelling constitutive model which has been recently implemented for the finite element software plaxis. The suitability of this model to simulate the performance of swelling soil is verified by conducting a numerical simulation to one of the huder-amberg oedometer tests through the oedometer soil test facility available in plaxis software. Finally, based on the aboveselected experimental approach, swelling parameters were determined from the experimental tests conducted on different soil samples collected from some selected arid/semi-arid regions in egypt. Such test results were summarized and presented as a useful key-parameters of these swelling soils which can be used as pre-determined inputs in any further numerical analyses.

scholarly journals Agroecological assessment of water-physical properties of irrigated soils of the Trans-Urals in the analysis of the main hydrophysical characteristics

2021 ◽  
Vol 36 ◽  
pp. 03014
Author(s):  
I.V. Komissarova ◽  
A.V. Chelovechkova ◽  
N.V. Miroshnichenko
Keyword(s):  
Physical Properties ◽  
Soil Properties ◽  
Granulometric Composition ◽  
Water Transfer ◽  
Soil Stratum ◽  
Irrigation Rate ◽  
Irrigated Soils

Water-physical properties of soils are a set of soil properties that determine the accumulation, preservation and water transfer in the soil stratum. One of the important indicators of water-physical properties are soil-hydrological constants. These indicators can be used in forecasting yield, calculating the irrigation rate. The determination of soil-hydrological constants is a rather laborious process. In this article, we propose to obtain soil-hydrological constants from the data of the main hydrophysical characteristics. This technique allows to analyze the data and obtain soil-hydrological constants from the data of granulometric composition. The conducted studies have shown that the use of uncontrolled irrigation has led to the transformation of water-physical properties, the content of easily mobile, productive and gravitational moisture has decreased. When modeling the MHC curve, a change in the shape on the graphs can be noted.

scholarly journals Measuring thermal conductivity of soils under laboratory conditions.

1969 ◽  
Vol 17 (1) ◽  
pp. 71-79
Author(s):  
A.I. Golovanov
Keyword(s):  
Thermal Conductivity ◽  
Flow Velocity ◽  
Soil Sample ◽  
Water Flow ◽  
Coarse Sand ◽  
Conductivity Measurements ◽  
Soil Layers ◽  
The Real ◽  
Real Flow

Experiments were made to determine the influence of size of soil sample, convection and water flow on the determination of thermal conductivity of soils using a thin needle (0.05 cm radius, 8.5 cm in length) as the heating element and copper cylinders for sample containers. For measurements during a period of 100 seconds the diameter of the sample must be at least 4 cm and to avoid any influence of convection measurements should not exceed 100 seconds. When heating elements are placed horizontally to measure simultaneously the thermal conductivity of different soil layers they should be placed at least 10 cm apart. Thermal conductivity measurements could be used to determine flow velocities of water in coarse sand samples provided that the real flow velocity was highev than 0.35 cm/ min. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Diagnostics of boron deficiency for plants in reference to boron concentration in the soil solution  

2013 ◽  
Vol 59 (No. 8) ◽  
pp. 372-377 ◽  
Author(s):  
W. Szulc ◽  
B. Rutkowska
Keyword(s):  
Soil Properties ◽  
Soil Solution ◽  
Boron Concentration ◽  
Chemical Properties ◽  
Boron Deficiency ◽  
Organic C ◽  
Physico Chemical ◽  
Nutritional Needs ◽  
Cultivated Soils

The determination of a range of boron concentration in the soil solution, evaluation of the effect of physico-chemical soil properties on boron concentration in the soil solution as well verification whether boron quantity in the soil solution is sufficient for nutritional needs of selected plants cultivated in Poland were comprised. Average boron concentration in the soil solution of Poland&rsquo;s cultivated soils ranges from 0.59 to 5.07 &micro;mol/L and is differentiated by physico-chemical properties of soil. Taking into account decreasing effects of soil properties on the increase of boron concentration in the soil solution, the soil properties can be arranged as follows: organic C &gt;<br />soil abundance in available boron &gt; soil texture &gt; soil pH. The minimum boron quantity observed in the soil solution of Poland&rsquo;s cultivated soils was not sufficient to fulfil nutritional needs of the plants. The maximum boron quantity observed secured nutritional needs of cereals and potatoes but not those of rape plants and sugar beets. Based on the study it can be concluded that the measurement of the concentration of boron in the soil solution can be used in the diagnosis of deficiency of this element for crops.

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