Abstract
The Beris Dam is founded on a sequence of thick bedded to massive conglomerate and gritstone with some sandstone and mudstone, mapped as the Semanggol Formation of Triassic age. Portable shear box tests on polished surfaces of a sandstone, and a conglomerate, core yield friction angles of 18.0o and 20.8o, respectively. These friction angles are comparable with residual friction angles of between 17.5o and 19.0o determined in field and laboratory tests on sheared mudstone surfaces of the Semanggol Formation at the Muda Dam. Apparent cohesion values determined in the portable shear box tests result from the restricted normal displacement test conditions and should not be considered in shear strength calculations.
Highlights
IntroductionThe portable shear box (or field shear strength apparatus) was developed by Dr E
The portable shear box was developed by Dr E
The Beris Dam and its spillway are founded on a sequence of massive to thick bedded conglomerate and gritstone with some sandstone and mudstone that is mapped as the Semanggol Formation of Triassic age (Teoh, 1992)
Summary
The portable shear box (or field shear strength apparatus) was developed by Dr E. Hoek and designed to evaluate the shear strength of a discontinuity plane in the field (Aufmuth, 1973). The box operates in the same manner as a laboratory shear box and comprises two halves; the lower half having a hydraulic ram for shear, and the upper half a hydraulic ram for normal loading (Hoek and Bray, 1977). The portable shear box is widely used for routine testing it does have a number of disadvantages when precise control over testing conditions is required. The use of manually-operated jacks for instance, can make it difficult to control shear displacement and to maintain a constant normal stress throughout the test (Priest, 1993)
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