A sand sample is subjected to diroct shear testing at its normal (in situ) water content. Two tests are performed. For one of the tests, the sample shears at a stress of 3.000 psf when the normal stress is 4,000 psf. In the second test, the sample shears at a stress of 4,000 psf when the normal stress is 6,000 psf. From these data, determine the valoe of appareat cobesion and the corresponding angle of internal friction. | Numerade

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