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Latest Soil mechanics Stories

2011-10-25 13:24:15

Researchers studying how fluids travel through nanoscale channels were surprised to discover that the fluids don't flow equally well in all directions. Contrary to the behavior in the macroscale world, the researchers discovered that methyl alcohol, when it was placed in a network of nanoscale channels in a mineral known as a zeolite, diffused 1,000 times faster in one direction than another. This is the first known evidence of such highly unequal diffusion of molecules in a nanoporous...

2011-07-13 13:35:28

The extended Coulomb failure stress (ECFS) criteria and anisotropic porosity and permeability tensor at micro/meso/macro scale under ultra"℠high temperature and pressure (UTP) conditions were developed employing the flow driven pore"℠network crack (FDPNC) model under multiple temporal"“spatial scales and the hybrid hypersingular integral equation"℠lattice Boltzmann method (HHIE"℠LBM). The correlation of the Zipingpu reservoir and Longmenshan slip was then...

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2011-06-07 08:40:37

Findings could aid in the development of better technologies for hydraulic fracturing and other fluid extraction techniques from the earth When geologists survey an area of land for the potential that gas or petroleum deposits could exist there, they must take into account the composition of rocks that lie below the surface. Take, for instance, sandstone"”a sedimentary rock composed mostly of weakly cemented quartz grains. Previous research had suggested that compaction...

2010-08-02 17:14:33

A simple and inexpensive demonstration of soil water retention and field capacity Using little more than PVC rings, a trashcan, and a scale, students can literally get a feel for soil water retention and field capacity, concepts that are important and useful in fields from farming to engineering. The demonstration, developed by Adam Howard, Drs. Josh Heitman and Dan Bowman of North Carolina State University, was designed to illustrate concepts that can be difficult for students to visualize...

2009-10-02 16:26:00

WASHINGTON, Oct. 2 /PRNewswire-USNewswire/ -- The Honorable Jo-Ellen Darcy was sworn in today as the U.S. Army's 11th Assistant Secretary of the Army for Civil Works (ASA(CW)) in a Pentagon ceremony. Secretary of the Army John McHugh conducted the swearing-in ceremony. "I am tremendously honored to have this opportunity to serve as the Assistant Secretary of the Army for Civil Works," said Darcy. "America is faced with many challenges in how to best conserve, protect, enhance and use...

2008-07-31 03:00:28

By Andy Franks LONG BEACH - Your description of Tuesday's earthquake might be different from your friend's across town, but for a good reason: Geologic surveys show that some parts of Long Beach are more sensitive to ground motion. A survey conducted by the California Department of Conservation shows that large ground areas of Long Beach - including Belmont Shore and Naples Island - are more susceptible to liquefaction, or the sudden transformation of loose soils from a solid to a liquid...

2008-07-03 03:00:15

By Keener, H M Wicks, M H; Skora, J A VOLUMETRIC IMPORTANCE Study develops consistent methodology for accurately measuring volumes of unprocessed and processed materials at yard trimmings composting facilities. Part I OHIO has a total of four classes of compost facilities (I-IV) regulated by the Ohio Environmental Protection Agency (Ohio EPA), distinguished by the types of materials received and size of the facility. Class I facilities may receive any solid waste and require a permit...

2008-07-02 06:00:47

By Munch, E Franco, J; Deville, S; Hunger, P; Saiz, E; Tomsia, A P This work compares Two novel techniques for the fabrication of ceramic scaffolds for bone tissue engineering with complex porosity: robocasting and freeze casting. Both techniques are based on the preparation of concentrated ceramic suspensions with suitable properties for the process, in robocasting, the computer-guided deposition of the suspensions is used to build porous materials with designed three dimensional...

2008-05-28 03:00:16

By Singha, Kamini ABSTRACT The concepts of total stress, effective stress, and fluid pressure are important to understanding where water comes from when producing water from a confined aquifer system. However, the overall conceptual image of pumping confined aquifers is difficult for many students to grasp, because pore space is not drained, but rather water is produced as a function of the water and aquifer compressibilities. I present a simple, inexpensive demonstration, which can be used...

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2006-06-28 12:05:00

By Patricia Reaney LONDON (Reuters) - Creating artificial seismic waves, similar to those that occur during an earthquake, could help squeeze more oil from natural reservoirs, scientists said on Wednesday. They discovered that in addition to sending tremors that knock down buildings, earthquakes greatly increase the permeability of rocks to transmit fluids including oil. "Shaking increases permeability," Emily Brodsky, an assistant professor of Earth Sciences at the University of California,...


Word of the Day
negawatt
  • A unit of saved energy.
Coined by Amory Lovins, chairman of the Rocky Mountain Institute as a contraction of negative watt on the model of similar compounds like megawatt.