rice is one of the most important staple foods for more than half of the world's population. paddy soils are among the widest wet lands being affected by human activities. long term rice cultivation and especially flooding conditions have great influence on soil characteristics. this study was conducted in noorabad county, fars province. the aim of this study was to evaluate the effects of...

Scanning Electron Microscopy (SEM) has been widely used to investigate the microstructure of clays, and several studies have examined influence particles orientation on mechanical behaviour soil. However, as effect sample preparation that precedes imaging soil not systematically studied yet, extent which clay is disrupted quantified. This work investigated samples having different mineralogy, s...

The diversity of sandstones and sandstone properties that exist in nature pose a significant problem for engineers who deal with these materials, whether in oil well exploration and exploitation or art and architectural conservation. The solution proposed in this thesis takes a highly reductionist approach to the problem. Properties of the sandstone material are first reduced to material invari...

The detailed mineralogy of the Bullfrog and Tram Members of the Crater Flat Tuff from drill hole USW-G1 has been examined, primarily to characterize fully the amounts and types of clay minerals in the tuffs and the possible effects clay minerals have on rock properties. Results of bulk sample x-ray diffraction analyses agree closely with previous determinations, although slightly higher clay mi...

In this study, we performed one dimensional cylindrical sedimentation tests to investigate the impact of clay mineralogy, ionic concentration, valence on sedimentation, and self-consolidation behavior clay. The result at 1,000% 2,000% water content indicates that = showed higher coefficient initial settling velocity, faster initiation termination self-consolidation. Additionally, velocity decre...