A tunnelling construction site consists of two 10 m clay layers. The top layer has a strength of си = 90 kPa and the bot

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A tunnelling construction site consists of two 10 m clay layers. The top layer has a strength of си = 90 kPa and the bottom layer has cu = 60 kPa. The contractor proposed a 20m x 25m x 0.6m raft foundation placed at 4m below ground level to support 20 bentonite storage tanks. The inner diameter of each tank is 5m, and the height is 24m. Is this foundation safe when all tanks are filled with the bentonite slurry to their total capacity? = = Given: The mass of an empty tank = 4800kg. The density of the bentonite slurry = 1050kg/m3 and the density of concrete 2320kg/m3