Assignment 02

2-8 March 2015

Data

Data

Data

Result

Assignment 03

9-22 March 2015

Data

A 5 m diameter tunnel (r0=2.5 m) was subjected to uniform in situ stress

of pO= 2.5 MPa.

Determine:1. Plastic zone radii (rp)

2. Tunnel deformation (ui)

for the case of:a. No supportb. Support with a close ring of 50 mm thick shotcrete with a UCS of 14

MPa (after 1 day of curing)c. Support with a close ring of 75 mm thick shotcrete with a UCS of 35

MPa (after 28 days of curing)

DataRock massparameter Unit Mean St. Dev

f degree 22.85 1.31c MPa 0.23 0.066scm MPa 0.66 0.21E MPa 373 46