This paper presents the results of experimental studies on deformation and strength anisotropy gravel-pebble soils used in soil dams. During stabilometric tests, varying shear angles were obtained for stone at different orientations particles working chamber, whether horizontal or vertical. As hydrostatic pressure chamber increased to 0.8 MPa, a reduction by 8-12 degrees depending direction lay...

Submitted: Jul 12, 2013; Accepted: Aug 26, 2013; Published: Aug 29, 2013 Abstract: Sand production in water, oil and gas wells is usually controlled by gravel packing techniques worldwide. Consideration in the gravel pack design requires that the particle size is five or six times the formation sand depending on the formation sand median diameter. Sieve analysis result shows that the grain size...

Little is known about how much wastewater infiltrates the soil via the trench sidewall versus the trench bottom in onsite wastewater systems. Our objectives were to develop a method of simulating trench bottom and sidewall flow using a two-dimensional numerical computer model that would include the trench within the model space and determine how much sidewall flow would occur under steady-state...

Autonomous automobile technology is a rapidly developing field, with interest in both academia and industry. Outdoor navigation of autonomous vehicles, especially for roughterrain driving, has already been a new research focus. DARPA Grand Challenge and LAGR program stand for the top development level in this research region. Rough-terrain driving research offers a challenge that the in-vehicle...

Terrains have a key role in making outdoor virtual scenes believable and immersive as they form the support for every other natural element in the scene. Although important, terrains are often given limited interactivity in real-time applications. However, in nature, terrains are dynamic and interact with the rest of the environment changing shape on different levels, from tracks left by a pers...

Surface mining for coal has contributed to widespread deforestation and soil loss in regions around the world, particularly Appalachia, USA. Mined land reforestation is of interest this other where forests are dominant pre-mining use. This study evaluated mine development on surface-mined sites reforested according Forestry Reclamation Approach, representing a chronosequence time ranging from 0...

The spatial extent of the transported materials from three road types was studied in forest soil and vegetative communities in Vermont. Hypotheses were two-fold: 1) soil chemical concentrations above background environment would reflect traffic volume and road type (highway>2-lane paved>gravel), and 2) plant communities close to the road and near roads with greater traffic will be disturbance-t...

a r t i c l e i n f o Keywords: Fuzzy logic expert system Fuzzy inference system Soil quality Soil restoration Soil physical indicators Due to landscaping, mining and construction activities on previously cultivated land, more and more soils are excavated, translocated, deposited and restored. In many cases restored soils show signs of structural degradation such as overcompaction and water log...