Soil mechanics

Annotated Bibliography [1] R. Holtz, W. Kovacs, T. Sheahan. An Introduction to Geotechnical Engineering, 2nd Ed. New Jersey: Pearson, 2011, pp. 294-301. Liquefaction is a phenomena that appears in not very cohesive soils. There are many factors linked to the existence of quicksand. Holtz, Kovacs, and Sheahan describe how the seepage forces, liquefaction, earthquakes, soil stress and underground water table are crucial elements to the understanding of quicksand. Additionally, the book provides practical methods to understand liquefaction and how it has affected engineering structures around the world. “If the seepage forces are large enough, the effective stress can go to zero and the soil becomes essentially a dense liquid called quicksand. Another important consequence is liquefaction caused by vibrations from earthquakes and other dynamic sources.” (294) [2] M. Schenke, B. Markert, W. Ehlers. (2013, April)."Liquefaction in Fluid-Saturated Soils" Proceedings in Applied Mathematics and Mechanics. [Online]. vol 13, issue 1, pp.145-146. Available: http://onlinelibrary.wiley.com/doi/10.1002/pamm.201310068/abstract [Feb. 25, 2016] Quicksand originates from diverse factors, one of them, Liquefaction. Schenke, simulated a dynamic liquefaction mathematical simulation. It was based on…

Literature Review: 2.1 Introduction Modern peat soil research focus on peat soil improvement using chemical stabilization since 19th century. The stabilizer that can be used for the peat soil chemical stabilization have increased in varieties. Ordinary Portland cement and lime are two of the most common peat soil stabilizer found. However, due to the scarcity of the natural resources, substitution for the peat soil stabilization study was done in recent. In this context, few of the researches…

Cheap sheds in Orrell are a great storage space for all your garden tools, potting soil and compost. If you are an avid gardener and like nothing better than pottering in your vegetable garden on a Saturday afternoon, you will most likely want a safe storage space for all your gardening equipment. Keeping garden tools in the garage can take up space, and the smell of the compost and potting soil can smell a bit strong when it is mixed with odour of mechanics. In Orrell, cheap sheds are on offer…

Introduction: Soil samples where collected to test at Green River College, King County Washington, Sec 16 T21N R05E, W.M. in the gator pond retention area. Testing was done every half chain, for a distance of 528 feet to the north/south, 16 lines. Plots to the east/west where done until the water no longer flowed into the water shed. Data collected included, amounts of sand silt and clay, the amount of gravel, and dominate and co-dominate species in a 4 foot radius and the density of each plot.…

maintaining and managing natural water sources which used by agro-pastoralists. The Mara river basin is a major source of water in the Serengeti, not only for the wild life but the rural community that rely on agriculture as a source of livelihood in the area. Over the years drought has led to the decrease of water in the river. This has lead the community living around the area to migrate closer to the water source in turn destroying the ecosystem around the basin due to deforestation. A study…

carbon dioxide, and other greenhouse gases. “Soil biological processes have major long-term effects on composition of Earth’s atmosphere, which in turn influences all living things, including soil microorganisms” ( Brady, Weil 2008). Changes in atmospheric concentrations of carbon dioxide, temperature, and precipitation amounts and patterns will modify the soil plant system, and influence decomposition rates which will have impacts…

of the soil health and fertility around the world. There are many causes to this, which will be explained later on into this essay. This is a problem that needs to have more focus put on it because soil health and fertility is arguably the basis for all of our foods and without having healthy and fertile soil, there will be a decrease in the amount of crops produced. But not only is the amount of crops produced affected, the overall nutrient level in the food that farmers are growing is lower…

Soil erosion is one of the most serious threats in our world. Humans cause 40% of soil erosion. Soil erosion is topsoil, which is organic soil made up with rich nutrients. Erosion can be caused by careless farming techniques that lead to water erosion. When it is raining and you are walking to class you can see soil erosion where they have been working beside the English building. Soil erosion and water erosion is practically the same thing. No one will ever notice soil erosion because nobody…

The early civilizations in India, South America, Japan, and china practiced intensive agriculture and it is known that they utilized agricultural, animal and human residue as fertilizer (Howard, 1943, Food and Agriculture Organization, 1978). Many of these residues either were placed in pits or placed in heaps and allowed to rot for long period of time for the production of soil amendment. The first waste pits made out of stone and built outside the houses were found in Sumerian cities about…

What is the effect of changing the pH of the soil on the germination and growth of mustard peas? Hypothesis: The greatest number of peas will germinate and will grow the most when the pH is 5 or 7. Theory: Enzymes play a vital role in the cells of plants (especially when growing) and enzymes work best when at their optimum pH value. Moreover, all chemical reactions have an optimum pH at which they work best (Howard and Loomis, no date). Generally the enzymes in plants work best at a pH of…