地下深開挖岩體在十萬年再現週期之地震歷時下安全性評估模式之研究

陳科翰

doi:10.6844/NCKU.2013.01237

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地下深開挖岩體在十萬年再現週期之地震歷時下安全性評估模式之研究

A Study on Safety Assessment of Deep Underground Excavation of Rocks Subject to Seismic Loading with 100,000-year Return Period

陳科翰 , Masters　　Advisor：王建力　　

繁體中文 DOI： 10.6844/NCKU.2013.01237

地下深開挖；地震荷載；安全係數； Deep underground excavation ； seismic loading ； factor of safety

Abstract │ Reference (84) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

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This study investigates the stability and safety analysis of surrounding rocks of a deep underground excavation subject to seismic loading with 100,000-year return period. Two study sites are chosen in this study, they are Northeast site and Southeast site. The values of peak ground acceleration (PGA) with 100,000-year return period for study research site have been obtained by seismic hazard analysis and the decaying PGA curve. This study firstly selects the appropriate original earthquake time histories and synthesizes the design acceleration time histories which are consistent with the response spectrum of 100,000-year return period of each study site.
A finite element package ABAQUS has been used to carry out a 2-dimension plane strain meshing model for a deep underground excavation with different conditions. This study establishes a numeral model with different rock properties and different overburden depths and discusses the effects of effective stresses when ground water exists. The dynamic analysis of underground excavation under different conditions was carried out with the input data of 100,000-year return period acceleration time history. The concept of Factor of Safety (F.S.) based upon Mohr-Coulomb failure criterion was used in this study.
Due to the dispersion and uncertainty of rock parameters, the sensitivity analysis has been conducted in this study to assess the relative importance of rock parameters on the values of factor of safety of the surrounding rocks.
The study shows that: (1) According to the sensitivity analysis, the values of F.S. near the excavation area are easily affected by the cohesion of rocks. (2) The value of F.S. of surrounding rock decreases due to a rapid increase in deviator stress when getting closer to the excavation region. (3) The value of F.S. has a decreasing trend as the overburden depth increases. (4) The pore pressure has a less effect on the value of F.S. than overburden depth does. (5) The effect of earthquake on the value of F.S. decreases with the increasing of overburden depth.

Reference ( 84 ) 〈TOP〉

[22]黃楚琳，「花蓮和平地質區岩性構造的地球物理探勘」，國立臺灣師範大學地球科學研究所碩士論文，2012。
連結：
[27]陳幼欣，「美濃地區斷層活動性監測之研究」，國立成功大學地球科學研究所碩士論文，2004。
連結：
[39]許華杞，「花蓮地區之地殼變動觀測與地震預測研究」，大漢學報，第9期，第73-80頁，1995。
連結：
[55]Carpenter, D. W. and D. C. Chung, “Effects of earthquakes on underground facilities,” NUREG/CR-4609, Lawrence livermore national lab, pp. 1–52, 1986.
連結：
[57]Cornell, C. A., “Engineering seismic risk analysis”, Bulletin of the Seismological Society of America, Vol. 58, No. 5, pp. 1583-1606, 1968.
連結：

Times Cited (1) 〈TOP〉

林季平(2014)。地下深開挖岩體在十萬年再現週期之地震歷時下安全性評估模式之研究－以台灣及金門地區為例。成功大學資源工程學系學位論文。2014。1-101。

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