Principles And Practice Of Engineering (PE) Civil: Water Resources And Environmental (WRE) Practice Exam

The correct choice for identifying a soil type with none to slight potential for frost heave is the first option, which corresponds to GW, or well-graded gravel. This type of soil typically consists of larger particles that allow for good drainage, making it less susceptible to water retention. Since frost heave is primarily caused by the freezing of water in the soil, the ability of well-graded gravel to drain effectively minimizes the amount of water that can freeze, thereby reducing the potential for frost heave. In contrast, clay soils (like CL and CH), which have smaller particles and high plasticity, can retain moisture and expand significantly when water content freezes. These soil types are known for having a significant potential for frost heave due to their water retention capabilities and the expansion that occurs when water converts to ice. The ML soil type, classified as lean clay or silt, also has some potential for frost heave, though it is generally less than that of high plasticity clays. However, compared to well-graded gravel, it still has a greater likelihood of retaining moisture and undergoing frost heave. Overall, GW stands out as the safest choice due to its composition and drainage properties, making it a low-risk option for frost he