| 三孔小净距隧道群极限状态下围岩破坏特征研究 |
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| 引用本文： | 陈鹏,吴贲,杨小礼.三孔小净距隧道群极限状态下围岩破坏特征研究[J].湖南文理学院学报(自然科学版),2012(1):59-62. |
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| 作者姓名： | 陈鹏 吴贲 杨小礼 |
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| 作者单位： | 中南大学土木工程学院 |
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| 基金项目： | 中铁四局集团有限公司资助项目(2260) |
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| 摘 要： | 平行三孔大断面小净距隧道开挖时,围岩应力场经过多次扰动叠加发生重分布,不再是单个隧道的简单叠加.利用强度储备法求得极限状态下的隧道围岩各点的安全系数,绘出开挖断面附近围岩的点安全系数分布图,并对不同净距与埋深对围岩极限状态的破坏特点进行研究.结果表明:随着净距的增大,洞周达到强度极限的围岩范围增大,围岩自身稳定性不断提高;埋深较小时,边洞的拱顶变形小于中洞,而当埋深大于25 m时,三洞的沉降大致相等.
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| 关 键 词： | 三孔小净距隧道 埋深 点安全系数 极限状态 围岩稳定性 |
Failure property of surrounding rock for three tunnels with small interval |
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| CHEN Peng,WU Ben,YANG Xiao-li.Failure property of surrounding rock for three tunnels with small interval[J].Journal of Hunan University of Arts and Science:Natural Science Edition,2012(1):59-62. |
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| Authors: | CHEN Peng WU Ben YANG Xiao-li |
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| Institution: | (School of Civil Engineering,Central South University,Changsha 410075,China) |
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| Abstract: | As the distribution of surrounding rock stress caused by disturbance and superposition,the field of the surrounding rock stress is no longer the simple sum of single tunnel when parallel tri-tunnel with large-span and small-distance is excavated.By obtaining the point safety coefficient of limit state by the strength reserve method,the figure of the point safety coefficient distribution near excavation section is drawn.What’s more,the damage characteristics of limit state of surrounding rock with different interval and buried depth is analyzed.The result shows that the area of the surrounding rock reaching the strength limit and the stability increases with different interval.The crown settlement of side tunnel is smaller than the middle one when the buried depth is small and that of the three tunnels is roughly equal when the depth is larger than 25 m. |
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| Keywords: | three tunnels closely built cover depth point safety coefficient limit state stability of the surrounding rock |
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