The following data was obtained from CD direct shear tests on NC and OC specimens of a low plasticity clay. The OC specimens were originally consolidated to 600 kPa, then rebounded to obtain the OCRs shown below. Determine the Hvorslev shear strength parameters ∅’_e, c _e,  and the Hvorslev coefficient K (After Perloff and Baron, 1976.)?

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Normally Consolidated Shear Stress at Overconsolidated Consolidation Stress, o'. (kPa) 200 Void Ratio at Shear Stress at Void Ratio at Failure, 7, (kPa) Failure, 7, (kPa) Failure, e, Failure, e, 1.07 0.935 0,855 OCR 100 200 300 165 115 200 0.923 400 600 6. 0.965 0,900