A single rectangular opening 10 ft (3.0 m) in height is driven in rock having strengths of fc = 18,000 lb/in2 (124 MPa) and ft=1500 lb/in2. (10.3 MPa).Rock specific gravity is 2.3.The opening is located at depth of 2000 ft (610 m) in a stress field of no lateral pressure and has a fillet ratio of h .a. Determine if the opening will fail when its width is 20 ft (6.1 m).b. Is there any benefit to reducing the width to 10 ft (3.0 m)? To 5 ft (1.5 m)?c. What is the maximum safe width of opening? having strengths of f.= 18,000 lb/in. (124 MPa) and f,- 1500 lb/in.2 (10.310.10 A single rectangular opening 10 ft (3.0 m) in height is driven in rock10ng strengths of fe= 18,000 lb/in. (124 MPa) and f, -1500 lb/in. (10.3MPa), Rock specific gravity is 2.3. The opening is located at a depth of 2000O (610 m) in a stress field of no lateral pressure and has a fillet ratio of .a. Determine if the opening will fail when its width is 20 ft (6.1 m).b. Is there any benefit to reducing the width to 10 ft (3.0 m)? To 5 ft%DDOE(1.5 m)?c. What is the maximum safe width of opening?

Given Data: Opening height is Ho=10 ft. Strength of rock in compression is fc=18000 lb/in2. fc=18000…

Answered: A single rectangular opening 10 ft (3.0…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A single rectangular opening 10 ft (3.0 m) in height is driven in rock having strengths of fc = 18,000 lb/in2 (124 MPa) and ft=1500 lb/in2. (10.3 MPa).Rock specific gravity is 2.3.The opening is located at depth of 2000 ft (610 m) in a stress field of no lateral pressure and has a fillet ratio of h .
a. Determine if the opening will fail when its width is 20 ft (6.1 m).
b. Is there any benefit to reducing the width to 10 ft (3.0 m)? To 5 ft (1.5 m)?
c. What is the maximum safe width of opening?

having strengths of f.= 18,000 lb/in. (124 MPa) and f,- 1500 lb/in.2 (10.3
10.10 A single rectangular opening 10 ft (3.0 m) in height is driven in rock
10ng strengths of fe= 18,000 lb/in. (124 MPa) and f, -1500 lb/in. (10.3
MPa), Rock specific gravity is 2.3. The opening is located at a depth of 2000
O (610 m) in a stress field of no lateral pressure and has a fillet ratio of .
a. Determine if the opening will fail when its width is 20 ft (6.1 m).
b. Is there any benefit to reducing the width to 10 ft (3.0 m)? To 5 ft
%D
DOE
(1.5 m)?
c. What is the maximum safe width of opening?

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