Question: During a direct shear box test on specimens of a compacted sand the following results were recorded. Determine the peak and residual angles of friction.

During a direct shear box test on specimens of a compacted sand the following results were recorded. Determine the peak and residual angles of friction.

Normal load (N)	110	216	324	432
Ultimate shear load (N)	85	170	253	340
Residual shear load (N)	66	131	195	261

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