Abstract
The proliferation of Hoek-Brown nonlinear failure criterion and upper bound theorem makes it possible to evaluate the stability of circular tunnels with an original curved collapsing mechanism. The arch effect of shallow circle tunnel is not taken into consideration so that the mechanical characteristics can be easily described. Based on the mechanism, the upper bound solution of supporting pressure of tunnels under the condition of surface settlements and overloads on the ground surface is derived. The objective function is formed from virtual work equations under the variational principle, and solutions are presented by the optimum theory. Comparisons with previous works are made. The numerical results of the present method show great agreement with those of existing ones. With regard to the surface settlement and overloads, the influence of different rock parameters on the collapsing shape is analyzed.
| Original language | English |
|---|---|
| Pages (from-to) | 303-309 |
| Number of pages | 7 |
| Journal | Journal of Central South University |
| Volume | 22 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jan 2015 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2015, Central South University Press and Springer-Verlag Berlin Heidelberg.
Keywords
- Hoek-Brown criterion
- circular tunnel
- collapse mechanism
- surface settlement