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lab11_02 - The University of Iowa Department of Civil...

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The University of Iowa Department of Civil & Environmental Engineering 53:030 Soil Mechanics, Fall Semester 2002 Lab Experiment No. 11: Shear Strength of Sand via Direct Shear Tests A. Objective In this laboratory experiment, the shear strength of both loose and dense sand samples are measured using a displacement-controlled direct shear apparatus. The horizontal displacement h , the vertical displacement v and the shear force n F will be measured using L.V.D.T. transducers and a Labview® direct shear program. B. Experimental Procedure The experimental setup and procedure for this displacement-controlled test is standard and can be found in many references, for example in Experimental Soil Mechanics by J.P. Bardet, which is on reserve for this course in the Engineering Library. In the lab, your instructor will explain the direct shear apparatus and demonstrate the experimental procedure. A description of the direct shear test as a means of measuring the shear strength behavior of soils can also be found in Section 11.4 of your textbook. Upon becoming familiar with the direct shear apparatus, you will measure the shear strength behavior of both loose and dense sands. For both types of sand, the specimens will be sheared to failure along a fixed plane. For each type of sand (loose and dense): the shear test will be repeated three times with a different normal stress acting on the shear plane each time ( ) 400kPa and 200kPa, 100kPa, n for each trial, compute the initial dry density of sand in the apparatus, and the corresponding initial void ratio o e . 1) Prepare the shear box: Assemble the shear box by connecting the lower half and the upper half with the pair of alignment screws provided. Place the lower metallic pressure pad into the assembled shear box (via the top), and then place one porous plate on top of the lower metallic pressure pad.
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