Studies of surrounding rock stress change character and rockburst prediction of underground cavern during stepped excavation

QIU Dao-hong; ZHANG Le-wen; XUE Yi-guo; SU Mao-xin

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Studies of surrounding rock stress change character and rockburst prediction of underground cavern during stepped excavation

更新时间：2026-06-25

- Studies of surrounding rock stress change character and rockburst prediction of underground cavern during stepped excavation
- Vol. 32, Issue S2, (2011)
- 作者机构：
  
  山东大学岩土与结构工程研究中心,济南,250061
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU452
- Online First：26 August 2011，
  
  Published：2011
- 稿件说明：
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QIU Dao-hong, ZHANG Le-wen, XUE Yi-guo, et al. Studies of surrounding rock stress change character and rockburst prediction of underground cavern during stepped excavation[J]. 2011, 32(S2).
DOI：

QIU Dao-hong, ZHANG Le-wen, XUE Yi-guo, et al. Studies of surrounding rock stress change character and rockburst prediction of underground cavern during stepped excavation[J]. 2011, 32(S2). DOI：

摘要

摘要：为分析大型地下洞室分步开挖各开挖层之间的应力相互影响情况及利用先开挖层的岩爆发生情况来预测后开挖层的岩爆情况，采用数值计算和现场监控测量的方法进行了一系列计算分析。结果表明：当初始应力场中水平应力和竖向应力相当时，随着不断地开挖进尺，拱顶、底角和底板的应力先期增加明显，后期增幅变小，逐渐稳定。先开挖层若发生岩爆，后开挖层底角和底板也会出现岩爆，洞室先期开挖岩爆的风险较大，后期较小。当初始应力场中水平应力占主导地位时，随着不断地开挖进尺，拱顶、底角和底板的应力先期增幅不大，后期变化较快，侧压力系数越大，先开挖层若发生岩爆，后开挖层在后期开挖时出现岩爆的风险也越大。最后通过洞室的实际开挖情况验证了分析结果的正确性，利用各层之间的相互影响特征来预测后开挖层的变形破坏情况为地下洞室稳定性分析提供了一种新的思路。

Abstract

In order to analyze the mutual influence of different layers stresses in the progress of every excavation step and take advantage of the former rock burst situation to predict the rock burst intensity of later layer

numerical calculation and in-site supervision measure are adopted to conduct a series of calculations and analysis. The results show as follows. When horizontal stress and vertical stresses of the initial stress field are equal

the stresses of vault

corner and the floor increase significantly at early period

and smaller increase later

gradually stabilized with the excavation progress. If the former layer rock burst appears

the vault

corner and floor of the later layer rock burst appear too. Cavern excavation has greater risk of rock burst at early period and would be smaller later. When the initial stress field dominated by the horizontal stress

with the ongoing excavation steps

the stress of the vault

corner and the floor have no large increase at early period

but later period changed rapidly. The greater the lateral pressure coefficient is

the greater the rock burst risk of the later layer is in case that the former layer rock burst appears. Finally

it is proved that the correctness of analysis results by comparison with the actual excavation. The results provide a new idea to predict underground cavern stability of later excavation layer by using the interaction among the characteristics of every layer

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