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Stress Field Variation and Stability Analysis of Surrounding Rocks in Excavation of Metamorphic Rock Tunnel(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2018年第04期
Page:
497-504
Research Field:
工程地质
Publishing date:

Info

Title:
Stress Field Variation and Stability Analysis of Surrounding Rocks in Excavation of Metamorphic Rock Tunnel
Author(s):
ZHOU Xiao-lang ZHANG Chang-liang QIAO Peng-teng
School of Geology Engineering and Geomantics, Chang’an University, Xi’an 710054, Shaanxi, China
Keywords:
tunnel engineering surrounding rock fault zone intrusive body stress finite element numerical simulation full-face excavation
PACS:
P642.4;TU93+1
DOI:
-
Abstract:
In order to study the mechanical characteristics of tunnel surrounding rock during construction in complex engineering geological conditions, taking the proposed tunnel of Xihe-Houliu rebuild highway in Shiquan county of Shaanxi province as the research object, taking finite element as the research method, based on the data of topography, stratum lithology, hydrogeology and other engineering geological characteristics, the model related parameters were formed, and the tunnel three-dimensional geological numerical analysis model was established; the construction condition of one-way full-face excavation was simulated by tunnel passivation were formed, and the stress distribution characteristics and variation were studied. The results show that the excavated tunnel exhibits significant stress concentration, which brings the greatest impact on the top of the tunnel; when the excavated tunnel is not supported, the middle weathering chlorite quartz schist and the fault zone, in which the natural stress is in a critical state, are in a destructive stress state; the weak weathering chlorite quartz schist is quite stable before excavation, the same is true for weak weathering limestone and weak weathering diorite, and most of them are in a stable state with partial destruction after excavation; the stability of weak weathering carbonaceous quartz schist is not affected; in the reference monitoring data, the middle weathering chlorite quartz schist is unstable after excavation, and other strata are stable.

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Last Update: 2018-07-27