Densification is accomplished by:

Densification is accomplished by:

• A. Static Weight (Pressure)
• B. Impact (Sharp Blow)
• C. Vibration (Shaking)
• D. Kneading (Manipulation)

Answer: (C)

Densification means getting soil particles into a tighter packing by rearranging them to reduce voids, which increases density and bearing capacity. Vibration does this most effectively because the oscillating motion overcomes inter-particle friction, allowing grains to slide past each other and settle into a denser arrangement. Repeated vibration cycles continuously rearrange the matrix, filling voids that static pressure or single impacts can’t as efficiently address. Static weight compresses the soil slowly through constant pressure, but it often isn’t enough to overcome friction and rearrange particles in many soils. Impact can rearrange some grains but tends to be less uniform and may cause bouncing or cracking in certain materials. Kneading helps for specific cohesive soils by shearing and mixing, but vibration directly promotes the dense packing needed for most granular soils.

Densification means getting soil particles into a tighter packing by rearranging them to reduce voids, which increases density and bearing capacity. Vibration does this most effectively because the oscillating motion overcomes inter-particle friction, allowing grains to slide past each other and settle into a denser arrangement. Repeated vibration cycles continuously rearrange the matrix, filling voids that static pressure or single impacts can’t as efficiently address. Static weight compresses the soil slowly through constant pressure, but it often isn’t enough to overcome friction and rearrange particles in many soils. Impact can rearrange some grains but tends to be less uniform and may cause bouncing or cracking in certain materials. Kneading helps for specific cohesive soils by shearing and mixing, but vibration directly promotes the dense packing needed for most granular soils.