Swelling soils

Part 2 book "Principles of soil physics" includes content: Soils moisture potential; water flow in saturated soils; water flow in unsaturated soils; water infiltration in soil; soil water evaporation; solute transport; soil temperature and heat flow in soil; soil air and aeration; physical properties of gravelly soils; freezing and thawing effects, swelling soils, and other special problems.

384p muasambanhan07 08-02-2024 2 0   Download

The distinctive properties of bentonite, including hydration, swelling, water absorption, ion adsorption, high viscosity, and thixotropy make it a valuable material for many applications in geotechnical engineering such as hydraulic barriers, drilling slurry, and landfill liners. This study introduces gellan gum as a friendly environmental additive that improves bentonite slurry stability when bentonite is used for soil stabilization during excavation in emergency response.

10p visystrom 22-11-2023 6 3   Download

Using agricultural and industrial waste such as bagasse ash, groundnut shell ash and coal ash in stabilizing expansive soils are used as a subgrade material to reduce harmful impaction of swelling/shrinkage of expansive soils, reduce construction costs. It is also a solution for environmental protection.

9p visharma 20-10-2023 4 3   Download

A retaining wall constructed on expansive soil can be subjected to lateral swelling pressures due to soil swelling, which may cause a significant horizontal deformation and bending of the retaining wall. In Australia, it is generally assumed that the backfill behind a retaining wall is non-expansive material. Therefore lateral swelling pressures induced by expansive soils are ignored in routine design.

115p runthenight07 01-03-2023 8 2   Download

Satellite images have a remarkable ability to help researchers map the distribution and detect the nature of the soil exposed on the earth's surface. The remote-sensing mapping of clayey soils makes it possible to determine their shrinking-swelling potentials.

7p vinikolatesla 31-03-2022 8 2   Download

This paper presents the results of an experimental investigation of the effect of wetting-drying cycles on the surface cracking and swell-shrink behavior of modified expansive soils. An image processing technique was employed to understand this effect by quantifying the surface crack area density, crack number, crack length, mean crack width, and absolute shrinkage.

13p cothumenhmong9 12-01-2021 8 2   Download

The literal meaning of Hysteresis is to be lagged behind. In soil system, it is evident that the two soil moisture characteristic curves do not follow the exact same reversible path. As a result a hysteretic behaviour is experienced. Several causes may be attributed like non uniformity of pores, contact angle difference, entrapped air in pore space and the swelling and shrinking property of soil. To predict the hysteretic behaviour, several models defining the character were also suggested like Conceptual models and Empirical models.

6p gaocaolon9 22-12-2020 12 2   Download

An experiment entitled "Influence of pre and post-emergence herbicides on weed dynamics, growth and yield of soybean (Glycine max L.)" was conducted in Kharif season 2015 at research farm of BRAUSS, MHOW, (M.P.). The soil of the experimental field was medium black in texture, neutral in reaction (pH 7.60) with normal EC (0.45 dS/m) and medium organic carbon contents (0.72 %) and analysing low in available N (270 kg/ha), medium in available P (6.9 kg/ha) and high in available K (382 kg/ha) contents.

12p caygaocaolon6 30-07-2020 6 1   Download

Hydrogel is basically a water absorbing polymer, which are classified as cross-linked, absorb aqueous solutions through hydrogen bonding with water molecules. Agricultural hydrogels are referred to as water retention granules because they swell to many times their original size when they come in contact with water. It has been widely proposed over the last 40 years for agricultural use with the aim to ameliorate water availability for plants, by increasing water holding properties of growing media (soils or soilless substrates).

8p kequaidan4 05-05-2020 10 2   Download

Sowing is one of the important agricultural operations for raising crops. After harvest of paddy, if there is deficit moisture in the soil at the time of sowing of wheat, the germination gets affected leading to loss of yield. Handling of water treated seeds by seed drill may open a new gate of opportunities for mechanized sowing of wheat under water stressed conditions, which was the prime objective of the study.

11p chauchaungayxua3 07-02-2020 11 0   Download

The aim of this study was to study the use of a beads-based biofertilizer in crop production. The study focuses on the production of a beads-based biofertilizer containing spores and vegetative cells of Bacillus megaterium (B. megaterium) VACC 118. It also evaluated the quality of the biofertilizer and its effects on the growth and yield of cabbage. The results show that the density of B. megaterium in the beadsbased biofertilizer reached 4.34×1010 CFU/g and did not change after 6 months of storage. The degree of swelling of the beads was 1.

5p chauchaungayxua2 07-01-2020 36 0   Download

Far over the eastern half of Europe extends a vast and mighty plain, spreading thousands of miles to the north and south, to the east and west, in the north a land of forests, in the south and east a region of treeless levels. Here stretches the Black Land, whose deep dark soil is fit for endless harvests; here are the arable steppes, a vast fertile prairie land, and here again the barren steppes, fit only for wandering herds and the tents of nomad shepherds. Across this great plain, in all directions, flow myriads of meandering streams, many of them swelling into noble rivers, whose...

125p nhokheo9 06-05-2013 51 3   Download

The stability and performance of a structure founded on soil depend on the subsoil conditions, ground surface features, type of construction, and sometimes the meteorological changes. Subsoil conditions can be explored by drilling and sampling, seismic surveying, excavation of test pits, and by the study of existing data. Elaborate site investigation oftentimes cannot be conducted due to a limited assigned budget. For very favorable sites, such investigation may not be warranted.

280p beobobeo 01-08-2012 105 40   Download