What slope ratio is required for Type B soils?

• A. 1.1 or 45 degrees
• B. 1.5:1 or 34 degrees
• C. 3/4:1 or 53 degrees
• D. 90 degrees or vertical

Answer: (A)

The correct slope ratio for Type B soils is not 1.1 or 45 degrees. Type B soils are characterized by their cohesive properties, and the appropriate slope ratio for these soils is 1.5:1, which corresponds to approximately 34 degrees.

Type B soils can typically withstand a moderate degree of slope without significant risk of failure, which is why the 1.5:1 ratio is recommended. This ratio indicates that for every 1.5 units of horizontal distance, there is a 1 unit rise in vertical distance. This helps ensure stability during pipeline construction and aligns with safety regulations and industry best practices for excavation and slope management.

Understanding the properties of different soil types is crucial for construction inspectors as the slope ratio has direct implications on safety and structural integrity during the installation of pipelines.