CITY LABORATORY & ENGINEERING

261, East Nakhalpara,Tejgaon, Dhaka-1215, Bangladesh

Phone: 01716 11 90 02
            01718 44 18 58

Email: cle.dbd.gmail.com


Significance:

The direct shear test is one of the oldest strength tests for soils. In this laboratory, a direct shear device will be used to determine the shear strength of a cohesionless soil (i.e. angle of internal friction (Ø).
From the plot of the shear stress versus the horizontal displacement, the maximum shear stress is obtained for a specific vertical confining stress. After the experiment is run several times for various vertical-confining stresses, a plot of the maximum shear stresses versus the vertical (normal) confining stresses for each of the tests is produced. From the plot, a straight-line approximation of the Mohr-Coulomb failure envelope curve can be drawn, f may be determined, and, for cohesionless soils (c = 0), the shear strength can be computed from the following equation:

0 comments:

Post a Comment

 
Top