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Two flat jacks 12 in. square, are placed in the wall and roof of an approximately circular test gallery 8 ft in diameter. Flat jack 1 is horizontal, and placed in the side wall. Flat jack 2 is vertical, with its edge parallel to the axis of the gallery. The cancellation pressure measured were 2500 psi with FJ 1 and 900 psi with FJ 2. Estimate the initial stresses (vertical and horizontal). a) Vertical = 1037 psi; Horizontal 612 psi b) Vertical = 1050 psi; Horizontal 650 psi c) Vertical = 1062 psi; Horizontal

Two flat jacks 12 in. square, are placed in the wall and roof of an approximately circular test gallery 8 ft in diameter. Flat jack 1 is horizontal, and placed in the side wall. Flat jack 2 is vertical, with its edge parallel to the axis of the gallery. The cancellation pressure measured were 2500 psi with FJ 1 and 900 psi with FJ 2. Estimate the initial stresses (vertical and horizontal). a) Vertical = 1037 psi; Horizontal 612 psi b) Vertical = 1050 psi; Horizontal 650 psi c) Vertical = 1062 psi; Horizontal

Structural Analysis
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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Two flat jacks 12 in. square, are placed in the wall and roof of an approximately circular test gallery 8 ft in diameter. Flat jack 1 is horizontal, and placed in the side wall. Flat jack 2 is vertical, with its edge parallel to the axis of the gallery. The cancellation pressure measured were 2500 psi with FJ 1 and 900 psi with FJ 2. Estimate the initial stresses (vertical and horizontal). a) Vertical = 1037 psi; Horizontal = 612 psi b) Vertical = 1050 psi; Horizontal = 650 psi c) Vertical = 1062 psi; Horizontal = 687 psi d) Vertical = 1075 psi; Horizontal = 725 psi
Transcribed Image Text:Two flat jacks 12 in. square, are placed in the wall and roof of an approximately circular test gallery 8 ft in diameter. Flat jack 1 is horizontal, and placed in the side wall. Flat jack 2 is vertical, with its edge parallel to the axis of the gallery. The cancellation pressure measured were 2500 psi with FJ 1 and 900 psi with FJ 2. Estimate the initial stresses (vertical and horizontal). a) Vertical = 1037 psi; Horizontal = 612 psi b) Vertical = 1050 psi; Horizontal = 650 psi c) Vertical = 1062 psi; Horizontal = 687 psi d) Vertical = 1075 psi; Horizontal = 725 psi
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