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In the fifth video in the Bare Essentials of Soil Mechanics series, Professor John Burland explains how important water pressure in the voids between soil particles is in determining the soil's strength. John describes how major disasters can take place if geotechnical engineers don't take into account water pressure in soils. To reinforce the importance of taking water pressure into account, Professor Burland cites the Abervan disaster in which an unstable manmade soil mound above the village of Abervan engulfed a school, killing 116 children and 28 adults.
In the first of two demonstrations, Professor Burland shows how important water pressure is at the contact point between two soil particles. The conclusion is that water pressure reduces the shearing force between particles, reducing overall soil strength. In the second demonstration, Professor Burland uses the example of building sandcastles at the beach to show how a small amount of water can increase soil strength. He explains this phenomenon by introducing the concept of surface tension. Learning outcomes This video will help learners answer questions such as:
About the Bare Essentials of Soil Mechanics Series This video is part of the Bare Essentials of Soil Mechanics series, funded by the Ove Arup Foundation, in which Professor John Burland draws on his many years of practice in geotechnical engineering and teaching to provide listeners with what he regards to be the key knowledge that geotechnical engineers need to understand about soil mechanics in engineering practice. Prof Burland is based at Imperial College London and has worked on hundreds of interesting projects, the most famous of which was stabilising the Leaning Tower of Pisa. More engineering teaching resources available on www.expeditionworkshed.org This work is licensed under the Creative Commons Attribution-NonCommercial 3.0 Unported License. Credits
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Bare Essentials of Soil Mechanics - The Effect of Particle Size and Shape on Soil StrengthÂ14/2/2017 In the fourth video in the Bare Essentials of Soil Mechanics series, Professor John Burland demonstrates how soil grading (the range of particle sizes in a soil) and soil shape affect a soil's ability to resist load. In this video Professor Burland uses his base friction model, introduced in video 3 to model how changes to a soil affect its ability to resist the weight of a foundation pressing down on it. He compares the strength of a well-graded soil with a uniformly graded soil and demonstrates that a well-graded soil has greater ability to resist load.
Using the same model Professor Burland demonstrates the effect of particle shape on soil strength by comparing the behaviour of a soil made of round particles with the behaviour of a soil made of circular particles. The conclusion is the more angular the soil particles, the stronger the soil. More engineering teaching resources available on www.expeditionworkshed.org Learning outcomes This video will help learners answer questions such as:
About the Bare Essentials of Soil Mechanics Series This video is part of the Bare Essentials of Soil Mechanics series, funded by the Ove Arup Foundation, in which Professor John Burland draws on his many years of practice in geotechnical engineering and teaching to provide listeners with what he regards to be the key knowledge that geotechnical engineers need to understand about soil mechanics in engineering practice. Prof Burland is based at Imperial College London and has worked on hundreds of interesting projects, the most famous of which was stabilising the Leaning Tower of Pisa. This work is licensed under the Creative Commons Attribution-NonCommercial 3.0 Unported License. Credits Written and presented by: Prof John Burland, Imperial College, London. Concept design: http://www.thinkup.org/ Graphic design: http://thomasmatthews.com/ Direction/Production: http://www.ariesfilms.com/ Source: Expedition Workshed - www.expeditionworkshed.org Geomotion recently completed the establishment of a complete remote monitoring solution for South32 at its Worsley Alumina refinery near Collie. The system draws on data from piezometers spread over 5km across the site.  Worsley Alumina South-32 Refinery Manual monitoring of piezometers across the site was a lengthy process usurping a significant amount of man hours to ensure the safety of the plant infrastructure. With the new system implemented by Geomotion Australia, data is updated daily on a web based data management platform, with the ability to increase read frequency during critical periods. It allows up to date monitoring, comparison to weather events or pumping activity on site, and offers a comprehensive yet accessible review and report functions.  Worsley Control Room The Loadsensing G6 data logging system allows up to 10 years power autonomy, yet maximum coverage across the site. With a single Gateway positioned at the site communications tower, the site is covered for monitoring of tailings dams across the facility. Maxwell Geosystem’s Mission Monitor powers the data management and reporting functions.
The project follows the successful implementation of over thirty G6 data loggers across the Illawarra Region with Geosensing Solutions on behalf of South32. In the third video in the Bare Essentials of Soil Mechanics series, Professor John Burland demonstrates how deposition under gravity of soil particles, in lakes and rivers, affects how soils behave. Prof Burland is based at Imperial College London and has worked on hundreds of interesting projects, the most famous of which was stabilising the Leaning Tower of Pisa.
In this video Prof Burland uses an ingenious model to show in slow-motion how soils are laid down in rivers and lakes. He uses his model to show how soils laid down under gravity form column structures within their mass, which makes these soils stronger vertically than horizontally. Prof Burland then goes on to illustrate how gravity effects the strength of soil at different depths. His experiment shows that the more load a foundation carries, the further it will push into the soil before it reaches equilibrium. The conclusion is that soil strength increases with depth. Learning outcomes This video will help learners answer questions such as:
About the Bare Essentials of Soil Mechanics Series This video is part of the Bare Essentials of Soil Mechanics series, funded by the Ove Arup Foundation, in which Professor John Burland draws on his many years of practice in geotechnical engineering and teaching to provide listeners with what he regards to be the key knowledge that geotechnical engineers need to understand about soil mechanics in engineering practice. More engineering teaching resources available on www.expeditionworkshed.org This work is licensed under the Creative Commons Attribution-NonCommercial 3.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/b... Credits Written and presented by: Prof John Burland, Imperial College, London. Concept design: http://www.thinkup.org/ Graphic design:http://thomasmatthews.com/ Direction/Production: http://www.ariesfilms.com/ Source: Expedition Workshed - www.expeditionworkshed.org |
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