Fill in the blanks? (10 points) a) is defined as the method of mechanically increasing the density of soil by reducing volume of air. b) are geotechnical structures built to prevent soils from spreading laterally C) Particles of small sand sizes are rolled and carried short distances by wind to form or d) Although a soil may be predominantly coarse-grained, the presence of can have a significant effect on the properties of the mixture. e) Loccurs when saturated cohesionless sand deposits exist in a relatively loose condition. If subjected to vibration or shock waves, much of the soil shear strength will be lost. The rise may be only a fraction of an inch in sands, but can be several feet in clay or silty soils g) Negative pore water pressure tends to pull the particles together; therefore, it the shear strength of soils. h) is a curve which connects all points of equal stresses below the ground surface.
Understand how texture affects porosity and specific surface area. . What is the difference between the texture of a soil and its structure? . Describe 6 types of soil structural units or peds and tell where each is most likely to occur in the profile. Understand how soil aggregates form. What is the relationship between bulk density, porosity and soil com- paction? . A cylindrical core sampler (10 cm high x 10 cm diameter) is used for bulk density determination. The collected sample weighs 1420 g After oven drying it weighs 1300 g. What is the soil’s bulk density and porosity? . Which soil orders are likely to have bulk density less than 1 g cm-3? . How does the structure of a water molecule influence its properties and behavior in soils? A moist soil sample is collected in the field- the weight of the sample is 910 g and it has a volume of 500 cm3. After oven drying, the sample weighs 675 g. What is the gravimetric water content? The volumetric water content? What would the volumetric water content of this soil be at saturation? What is meant by “specific soil water potential”? What are the four components that determine the total soil water potential? . Understand how the soil-water retention characteristic links with ver- tical distributions of soil water above a water table. Define the following terms: saturation, field capacity, and permanent wilting point. What is the approximate soil water potential at each states defined above? . What is plant available water? How does it change with soil texture? . Compare and contrast saturated and unsaturated flow in soil. Be sure to address the driving forces and approximate water potentials over which each occur.
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