A 12 m-diameter shaft is to be developed down to a depth of 600 m, 3) where the in situ stress field is expected to be hydrostatic. The site characterization work indicates that the average density of the rock mass is 2550 kg/m3. The tests performed on the borehole cores in the area give the rock mass strength parameters to be UCS = 90 MPa, m, = 31, and GSI = 65. Smooth blasting will be applied to minimize the damage to the shaft walls. Determine if the strength of the shaft walls will be exceeded along its length, and if so, at what depth. %3D %3D

A 12 m-diameter shaft is to be developed down to a depth of 600 m, 3) where the in situ stress field is expected to be hydrostatic. The site characterization work indicates that the average density of the rock mass is 2550 kg/m3. The tests performed on the borehole cores in the area give the rock mass strength parameters to be UCS = 90 MPa, m, = 31, and GSI = 65. Smooth blasting will be applied to minimize the damage to the shaft walls. Determine if the strength of the shaft walls will be exceeded along its length, and if so, at what depth. %3D %3D

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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Question

A 12 m-diameter shaft is to be developed down to a depth of 600 m,
where the in situ stress field is expected to be hydrostatic. The site
characterization work indicates that the average density of the rock
mass is 2550 kg/m3. The tests performed on the borehole cores in the
area give the rock mass strength parameters to be UCS = 90 MPa, m=
31 , and GSI = 65. Smooth blasting will be applied to minimize the
damage to the shaft walls. Determine if the strength of the shaft walls
will be exceeded along its length, and if so, at what depth.
3)
!3!

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