Geosciences
Two classic lateral earth pressure theories (Coulomb and Rankine) were presented at failed stage in backfill soils, and these two theories are still popular among practicing geotechnical engineers. Several questions … Read More
Granular soils (sand and gravel, and maybe some silt) have very little interparticle interactive forces due to rather larger particle sizes. Therefore, most of their shear resistance comes from a … Read More
This is the earliest and simplest device to determine soil strength parameters.As seen in Figure 1, it consists of upper and lower shear boxes, and a soil specimen is placed … Read More
The presence of even small amounts of certain clay minerals can have significant effect on the properties of the soil. The identification of clay minerals requires special techniques and equipment.The … Read More
The vane shear test is an in-situ test for determining the undrained shear strength of soft to medium clays. Figure 1 is a schematic drawing of the essential components and … Read More
The dilatometer is an in-situ testing device that was developed in Italy in the early 1970s and first introduced in the U.S. in 1979. Like the cone penetrometer, the dilatometer … Read More
Procedure The test uses a thick-walled sample tube, with an outside diameter of 50.8 mm and an inside diameter of 35 mm, and a length of around 650 mm. This … Read More
Water and ease of excavation are common issues for most underground excavations of any great size as considerable costs can be incurred if predictions relating to either of these are … Read More
Determining the shear strength of a discontinuity is one of the most difficult tasks while it is probably the most important property to measure. A simple and often adequate assessment … Read More
A giant 70 million year old fossil of a fish that lived amongst dinosaurs has been discovered in Argentine Patagonia, a team of researchers said on Monday. Argentine paleontologists “found … Read More
