Directs Hear Test
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Transcript of Directs Hear Test
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DIRECT SHEAR TESTDIRECT SHEAR TEST
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Applications of Direct shearApplications of Direct shear
strength parameters (c ,strength parameters (c , ))
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Concept ofConcept ofDilatancyDilatancy and Shearand Shear
ResistanceResistance
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TYPICAL TEST RESULTSTYPICAL TEST RESULTS -- SANDSAND
Stress-Displacement
0.000
0.500
1.000
1.500
2.000
2.500
3.000
0.00 0.10 0.20 0.30 0.40 0.50 0.60
horizontal displacement (in)
shear
stress(
ksf)
normal stress = 1000 psf
normal stress = 2000 psf
normal stress = 500 psf
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Dilatancy in dense sandDilatancy in dense sand
Dilatancy Behavior
-0.035
-0.030
-0.025
-0.020
-0.015
-0.010
-0.005
0.000
0.005
0 0.1 0.2 0.3 0.4 0.5 0.6
horizontal displacement (in)
ve
rticaldisplacement(in)
normal stress = 500 psfnormal stress = 1000 psf
normal stress = 2000 psf
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Shear box w ith alignment screwsShear box w ith alignment screws
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Sample preparationSample preparation
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Place the shear box under the load cellP lace the shear box under the load cell
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Align the load cellAlign the load cell
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Clamp the shear box, so that onlyClamp the shear box, so that only
the lower half movesthe lower half moves
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Run the DIGISHEARRun the DIGISHEARsoftware and obtainsoftware and obtain
parameters c ,parameters c ,
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