What factor has varying effects on the cohesion of soil?

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Multiple Choice

What factor has varying effects on the cohesion of soil?

Moisture content directly changes how soil particles cling together, so it has varying effects on cohesion. In cohesive soils, a little moisture can increase apparent cohesion through capillary suction and electrochemical bonding, making the soil stickier. But as moisture rises toward saturation, pore water pressure lowers the effective stress and cohesive strength, so cohesion can decrease. In granular soils like sands, true cohesion is already minimal, so moisture doesn’t create lasting bonding and the material behaves mostly by friction. Heat has little practical impact on cohesion in normal soil conditions, and gradation mainly affects packing and friction rather than the cohesive forces themselves.

Moisture content directly changes how soil particles cling together, so it has varying effects on cohesion. In cohesive soils, a little moisture can increase apparent cohesion through capillary suction and electrochemical bonding, making the soil stickier. But as moisture rises toward saturation, pore water pressure lowers the effective stress and cohesive strength, so cohesion can decrease. In granular soils like sands, true cohesion is already minimal, so moisture doesn’t create lasting bonding and the material behaves mostly by friction. Heat has little practical impact on cohesion in normal soil conditions, and gradation mainly affects packing and friction rather than the cohesive forces themselves.

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