sample of dry sand is tested in direct shear. The shear box holding the sample has a circular cross section with a diameter of 50 mm. The normal (compressive) load imposed is 200 N. The sam- ple shears when the shear force is 130 N. (a) Determine the test normal stress and shear stress at failure. (b) Determine the angle of internal friction for this soil. (c) What is the probable condition of the tested sample (dense, loose, etc.)?

# 3) A sand soll sample is subjected to a direct shear test under a normal load of 185 kPa. The specimen failed when the shear stress reached 100 kPa. If the normal load is increased to 240 kPa, what will be the shear strength of the specimen?

Two undrained triaxial tests were conducted on soil specimen, and they gave the following results: Sample Confining Pressure Deviator Stress A 350 kN/m² B 500 kN/m² 150 kN/m² 300 kN/m² The shear strength of sample A in the plane of it's normal stress is A 588 kPa B 283 kPa C 730 kPa D 165 kPa Correct Option

a. A shear box test carried out on a soil sample gave the following results ✓ Vertical load [kg] 36.8 73.6 110.4 147.2 Gauge reading for proving 16 26 35 44 (shearing) ring [μm] If the shear box is 60 mm square and the proving ring constant/factor is 20 N/μm, determine the apparent cohesion and angle of internal friction for this soil. HINT: Determine normal stress from vertical load readings and shear stress from proving ring readings