动态荷载下地下深开挖岩体安全性评估模式的研究

陈科翰; 彭文飞; 郭俊志; 王建力

doi:10.3973/j.issn.1672-741X.2014.S.019

隧道建设 >

2014 , Vol. 34 >Issue 增刊: 117 - 121

DOI: https://doi.org/10.3973/j.issn.1672-741X.2014.S.019

研究与探索

动态荷载下地下深开挖岩体安全性评估模式的研究

陈科翰 ,
彭文飞 ,
郭俊志 ,
王建力

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(1.成功大学资源工程系，台南 70101； 2. 成功大学大地资源研究中心，台南 70101)

陈科翰（1987—），台湾台北人，2012年毕业于成功大学，资源工程专业，硕士。

收稿日期: 2014-06-16

网络出版日期: 2014-08-11

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A Safety Assessment for Deep Underground Excavation  in Rocks Subjected to Seismic Loading

CHEN Kohan ,
PENG Wenfei ,
KUO Chunchih ,
WANG Cheinlee

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(1. Cheng Kung University Department of Resource Engineering, Tainan 70101, Taiwan;  2. Cheng Kung University Geo Resources Research Center, Tainan 70101,Taiwan)

Received date: 2014-06-16

Online published: 2014-08-11

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摘要

分析探讨了地下深开挖岩体在动态荷载下的稳定性及安全性，使用有限元法，以研究区曾经发生的地震数据为基础，并考虑不同回归期的动态荷载情况，仿真各种动态荷载下岩体应力增量，配合MohrCoulomb破坏准则评估其安全性。研究发现：岩覆越深，初始静态安全系数越低，最低处则会出现在隧道上方拱顶位置，地震力引起的安全系数增量则随着深度的增加而减小。

关键词： 深岩覆; 岩石坑道; 动态荷载; 安全性评估

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陈科翰 , 彭文飞 , 郭俊志 , 王建力 . 动态荷载下地下深开挖岩体安全性评估模式的研究[J]. 隧道建设, 2014 , 34(增刊) : 117 -121 . DOI: 10.3973/j.issn.1672-741X.2014.S.019

Abstract

This study investigates the stability and dynamic safety analysis of surrounding rocks of a deep underground excavation subject to seismic loading. This study firstly selects the appropriate original earthquake time histories and synthesizes the design acceleration time histories which are consistent. This study establishes a numeral model with different rock properties and different overburden depths. The dynamic analysis of underground excavation under different conditions was carried out with the input data. The concept of Factor of Safety (F.S.) based upon MohrCoulomb failure criterion was used in this study. The study shows that: 1) The value of F.S. of surrounding rock decreases due to a rapid increase in deviator stress when getting closer to the excavation region. 2) The value of F.S. has a decreasing trend as the overburden depth increases. 3) The effect of earthquake on the value of F.S. decreases with the increasing of overburden depth.

Key words： deep underground; seismic loading; safety assessment

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