![]() Reference is made to Part 1 of the standard for general requirements that are relevant to all Parts. Shear strength is determined either by measuring the shearing force causing failure (direct shear tests) or by derivation from the measured compressive strength (unconfined or triaxial compression tests), these tests, and the apparatus used are described. None of these procedures therefore requires measurement of pore water pressure which is covered in part 8 of BS 1377. Part 7 of this standard describes methods of test for determining the shear strength parameters of soils in terms of total stresses, or (in the case of drained direct shear tests) in terms of effective stresses which are equal to total stresses. The standard is in the process of being revised and will comprise nine separate parts. BS 1377 was first published in 1948 and first appeared in metric form in 1975. It is part revision of clause 5 of BS 1377 : 1975 which is superceded by amendment. ![]() This Part of BS 1377 has been prepared under the direction of the Road Engineering Standards Policy Committee. ![]()
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