Question
A tunnel of length L = 141 m, height H = 6.9 m high, and width 6.0 m (with a flat roof) is to be constructed at distance d = 60 m beneath the ground. The tunnel roof is to be supported entirely by square steel columns, each with a cross-sectional area of 960 cm^2. The mass of 1.0 cm^3 of the ground material is 2.8 g.
What is the total weight of the ground material the columns must support?
What is the total weight of the ground material the columns must support?
Answers
bobpursley
totalweight= densityEarth*volume
= density*141*60*6.0 m^3
and the density=2.8g/cm^3 which is 2800kg/m^3
= density*141*60*6.0 m^3
and the density=2.8g/cm^3 which is 2800kg/m^3
ressy
How many columns are needed to provide a safety factor of two against rupture.