- 48 A tunnel of length L = 200 m, height H = 72 m, and wide6.3 m (with a flat roof) is to be constructed at distance d =-beneath the ground (Fig. 12-49). The tunnel roof is to be supportoBolt entirely by square steel columns, each with a cross-sectionalof 960 cm². The mass of 1.0 cm of the ground material is 28(a) What is the total weight of the ground material the colummust support? (b) How many columns are needed to keepcompressive stress on each column at one-half its ultima5.strength?

- 48 A tunnel of length L = 200 m, height H = 72 m, and wide6.3 m (w

1.	- 48 A tunnel of length L = 200 m, height H = 72 m, and wide6.3 m (with a flat roof) is to be constructed at distance d =-beneath the ground (Fig. 12-49). The tunnel roof is to be supportoBolt entirely by square steel columns, each with a cross-sectionalof 960 cm². The mass of 1.0 cm of the ground material is 28(a) What is the total weight of the ground material the colummust support? (b) How many columns are needed to keepcompressive stress on each column at one-half its ultima5.strength?
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