Abstract Stress distribution and the mechanism of stress-induced failures in surrounding rock mass of deep tunnels have been a common concern in rock mechanics research for rock mass behavior and underground engineering practice. The relationship between stresses and rock mass strengths becomes critical and thus constitutes the basis for understanding rock mass behavior at great depth. This paper presents the stress paths showing stress altering at a few selected locations after excavating a tunnel at great depth. By comparing to the failures of rock mass observed in Jinping auxiliary tunnels, these stress paths can well explain the mechanism of sidewall failures as a kind of stress relaxation, spalling and rockburst as a result of stress induced rock mass yielding at different confinement levels. V-notch brittle failure was reproduced by numerical method and the localization of stress-induced failure of brittle rock at great depth is discussed. Meanwhile the study also involves the size effect and stress path effect, which plays a significant role to understand the inherent mechanism of rock mass failurs by high stresses under large overburden.
Abstract：
Stress distribution and the mechanism of stress-induced failures in surrounding rock mass of deep tunnels have been a common concern in rock mechanics research for rock mass behavior and underground engineering practice. The relationship between stresses and rock mass strengths becomes critical and thus constitutes the basis for understanding rock mass behavior at great depth. This paper presents the stress paths showing stress altering at a few selected locations after excavating a tunnel at great depth. By comparing to the failures of rock mass observed in Jinping auxiliary tunnels, these stress paths can well explain the mechanism of sidewall failures as a kind of stress relaxation, spalling and rockburst as a result of stress induced rock mass yielding at different confinement levels. V-notch brittle failure was reproduced by numerical method and the localization of stress-induced failure of brittle rock at great depth is discussed. Meanwhile the study also involves the size effect and stress path effect, which plays a significant role to understand the inherent mechanism of rock mass failurs by high stresses under large overburden.
ZHANG Chun-Sheng-1,
HouJING 1,
Zhu-Yong-Sheng-2 etc
.Stress Distribution and Stress-induced Failures
in Surrounding Rock Mass of Deep Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2011,V48(3): 7-13
2011, Vol. 48 