Cost-Effective and Sustainable Road Slope Stabilization and Erosion Control (2012) / Chapter Skim
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8 CHAPTER TWO THE BASICS Good slope stabilization has three essential elements: proper planning and site investigation, understanding the soil, and knowing the surface and subsurface water conditions. This chapter summarizes literature and interview results on all three topics and provides additional resources for follow-up information.
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9 FIGURE 3 Unstable slope caused by freeze–thaw cycles in Alaska (Courtesy: J Currey)
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10 tionship among these components provides several important index properties, such as density, moisture content, and degree of saturation. Other characteristics that are important for classifying the soil and engineering soil structures (including slopes)
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11 – Weathering – Cyclic loading. • Increases in Shear Stress – Loads at the top of the slope – Water pressure in cracks at the top of the slope – Increase in soil weight resulting from increased water content – Excavation at the bottom of the slope – Drop in water level at the base of a slope – Earthquake shaking.
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12 rated and weakened. Construction of roads may also modify the surface and subsurface flow pattern of water, causing no flow or reduced flow in some natural channels but concentrated flow in others (Shrestha and Manandhar 2010)
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13 • Selection and design of culverts, low-water crossings, and bridges. Before surface and subsurface drainage measures are installed, drainage conditions and patterns should be studied.
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14 ideal for low-volume roads with low to moderate traffic speeds [less than 30 mph (or 50 kph)
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15 water before it gets to the road, (2) lower the water table, and (3)
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16 flow maintained, animal guards should be installed over them, and mowing crews should be careful to not crush or damage them. FIGURE 11 Subsurface drainage (Photo and drawing courtesy of G
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17 used to strengthen the slope around the drain or outlet. In Table 4, Howell (1999)
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18 2005) [Online]
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