A line load of infinite length has an intensity q per unit length. What is the vertical stress σz at a depth z below the earth at the centre of the load?
σz is the vertical stress at a depth equal to z in the soil mass due to a surface point load Q. The vertical stress at depth equal to 2z will be
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In a Newmark’s influence chart for stress distribution, there are 10 concentric circles and 50 radial lines. The influence factor of the chart is
Match List-I (Contact pressure distribution diagrams) with List-II (Description of footings) and select the correct answer using the codes given below the lists:
List-I
List-II
1. Rigid footing on cohesive soil
2. Flexible footing on cohesive soil
3. Rigid footing on cohesionless soil at ground level
4. Flexible footing on cohesionless soil at ground level
The intensity of vertical pressure, directly below a concentrated load of 3/2π tonnes at a depth of 3/2π metres is given by
Boussinesq’s influence factor for vertical pressure at depth Z and at the centre of a circular area of diameter A carrying uniformly distributed load is
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I
A. Stress distribution due to point load in homogeneous isotropic medium
B. Stress distribution due to point load in an anisotropic soil medium
C. Influence chart for stress distribution in a rectangular area
D. Influence chart for stress distribution in irregularly shaped areas.
List-II
1. Stein Brenner
2. Newmark
3. Boussinesq
4. Westergaard