gypsum found in the soil beneath the foundation of structures, specially hydraulic structures, can cause serious damage to them. the mechanical behavior of gypsiferous soils has not so far been investigated in detail except for the works of petrukhin (1993). here, it has been tried to investigate the mechanical behavior and the effect of soil being leached on settlement and strength of these ki...

Six soil pedons were selected, represented by the governorates of Salah al-Din and Najaf, distributed as three for each governorate located within a study path them according to geological formation, their physiographic location accompanying difference in sedimentation conditions resulting from different sources parent material. The results mineral examinations showed predominance light mineral...

Gypsum karst problems in the Permian and Triassic sequences of England have caused difficult conditions for bridge and road construction. In Northern England, the Ripon Bypass crosses Permian strata affected by active gypsum karst and severe subsidence problems. Here, the initial borehole site investigation for the road was supplemented by resistivity tomography studies. The roadway was reinfor...

Abstract An experiment was conducted to compare the unsaturated hydraulic conductivity (K) calculated by Jackson equation and van Genuchten for soils different in gypsum content treated with some soil conditioners. Two were used, gypsiferous (410 gm kg-1gypsium) clayey (435 kg-1 clay), mixed three levels 0, 50, 100%. The peat moss 0 and1%, polymer,0,1.and 2% without addition. Then, packed into ...

In order to accurately model soil reclamation with concentrated electrolytes such as CaCl2 or sea water, it must be determined if there is an effect of salinity on the Na-Ca exchange selectivity. A new procedure for determining Na-Ca selectivity in calcareous and gypsiferous soils was used to study the effects of ionic strength and mineralogy on Na-Ca exchange. Four specimen clay minerals and t...

The importance of soil properties in wine grape production is generally treated as secondary to climate and canopy management. This study was undertaken characterize classify a singular resource for vineyard traditional viticultural region: Castilla-La Mancha, central Spain. under described sampled using standard survey procedures outlined by FAO, served pedologic window Gleyic Fluvisol (Calcar...

Unlike conventional sensor systems such as Landsat-TM, Spot-MX or IRS-LISS, which acquire data in only a few spectral bands, the development of scanner systems that acquire data in many narrow-wavelength bands allows the use of almost continuous reflectance data in studies of the Earth’s surface. This not only produces laboratory-like reflectance spectra with absorption bands specific to object...

agh darreh tailing dam located in 23 km north of takab, west azarbayjan province is used for disposal of mine tailings. the tailing dam and its reservoir were constructed on gypsiferous marlstones. this is emphasis on geotechnical and environmental importance of the site. although construction of dams on gypsum rocks were not yet prohibited, but the dissolution of gypsum in contact with water i...