Registered Civil Engineer — Geotechnical (China)

Practice session

Under the Technical Code for Ground Treatment of Buildings (JGJ 79-2012), a sand-gravel cushion replacement (砂石垫层) of thickness z = 1.5 m is placed under a strip footing of width b = 2.0 m. The stress diffusion angle of the compacted granular cushion is θ = 30.0° (tan 30° = 0.577). What is the expanded bottom width b' of the cushion over which vertical stress is distributed to the underlying soft soil?

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