Geomechanics Lab Report

| 3/29/2011| | | | CIVL462 Laboratory ReportGeomechanics 2| | | | | | Justin Hill 3463527 comp some(prenominal) 2| CIVL462 Laboratory Report Geomechanics 2 Direct Shear tribulation Introduction The rob effect is one of the most master(prenominal) engineering properties of a realm as it is required whenever a structure is built. Structures require foundations in the ground and solid foundations argon dependent on a grounds trim resistance. Moreover, the pluck strength is demand for engineering situations such as calculating the pressure exerted by a soil on a retaining wall, sheet piling, ascertain the stability of shifts or cuts and determine the bearing capacity for foundations. In this Laboratory, a direct soak device exit be used to determine the snip strength of a cohesionless soil. In this case, dry river sand was used. The clip strength is directly colligate to the incline of internal friction. From plotting shear tautness versus horizontal version for different perpendicular close-fitting stresses, the maximum shear stress for each can be obtained. After several trials, a plot of maximum shear stress versus vertical (normal) confining stress is produced. A unfeigned line approximation for the Mohr-Coulomb disappointment envelope can because be drawn.

The friction angle is thus calculated from the slope of the failure envelope. As with any experiment, the more tests taken for different normal stresses, the more sinless the Mohr-Coulomb failure envelope will be. Experimental Procedure * Weigh the initial mass of soil and record it. * Measure the height, width and distance of the shear case and record it. ! * Place the sample in the shear box, direct off the top and then calculate the sample over again to compute the mass of soil used. * see the direct shear device, initializing the three gauges to zero. (Horizontal dial reading, horizontal and vertical displacement readings. * notice vertical load to 10kg, 20kg and 30kg for each...If you want to convey a panoptic essay, order it on our website: OrderEssay.net

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