Question

For maximum vertical stress, the shear stress is _________ if the load is 30 kN and r=4m.

(a) 0.4356 kN/m^2

(b) 0.1359 kN/m^2

(c) 0.1518 kN/m^2

(d) 0.3625 kN/m^2

The question was asked in unit test.

My doubt is from Stress Distribution topic in chapter Stress Distribution of Geotechnical Engineering I

Answer 1

Correct answer is (b) 0.1359 kN/m^2

For explanation I would say: Given,

r=4m

Q=30 kN

\(τ_{rz}=\frac{0.0725Q}{r^2} \)

\(τ_{rz}=\frac{0.0725*30}{4^2} \)

∴ τrz=0.1359kN/m^2.