| 内出进洞方式对浅埋偏压隧道洞口段围岩稳定性影响研究 |
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| 引用本文： | 杨超,张永兴,黄达,娄勇.内出进洞方式对浅埋偏压隧道洞口段围岩稳定性影响研究[J].水文地质工程地质,2012,39(4):49-54. |
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| 作者姓名： | 杨超 张永兴 黄达 娄勇 |
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| 作者单位： | 1. 重庆大学土木工程学院,重庆,400045
2. 重庆大学土木工程学院,重庆 400045;山地城镇建设与新技术教育部重点实验室(重庆大学),重庆 400045 |
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| 基金项目： | 长江学者和创新团队发展计划，国家自然科学基金，中国博士后科学基金特别资助 |
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| 摘 要： | 厦蓉线水都高速平寨隧道左洞洞口受施工条件、浅埋和偏压等因素的影响,采取了中横洞内出的进洞方法。现场监测成果表明施工取得了良好的效果。为研究该进洞方式对洞口浅埋偏压段围岩稳定性的影响,利用FLAC3D程序对平寨隧道施工过程进行三维仿真分析,比较中横洞内出和正面开挖两种进洞方式下左洞洞口围岩变形和应力变化情况,结果表明中横洞内出方案对近洞口约24m范围内围岩影响较小,为较优方案。
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| 关 键 词： | 隧道工程 内出进洞方式 浅埋偏压 洞口段 围岩稳定性 |
A study of tunnel surrounding rock stability of shallow and unsymmetrical loaded portal section with excavation sequences from inside |
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| YANG Chao
,
ZHANG Yong-xing
,
HUANG Da
,
LOU Yong.A study of tunnel surrounding rock stability of shallow and unsymmetrical loaded portal section with excavation sequences from inside[J].Hydrogeology and Engineering Geology,2012,39(4):49-54. |
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| Authors: | YANG Chao ZHANG Yong-xing HUANG Da LOU Yong |
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| Affiliation: | 1(1.College of Civil Engineering,Chongqing University,Chongqing 400045,China; 2.Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University), the Ministry of Education,Chongqing 400045,China) |
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| Abstract: | The Pingzhai tunnel is located in the Shuidu Highway of the Xia-Rong Line.The middle horizontal adit is used to enter the left tunnel portal,which is affected by construction conditions,shallow buried and unsymmetrical loadings.Field measurements show that good effect has been achieved in the construction.To examine the effect of this excavation sequences on surrounding rock stability of shallow buried and unsymmetrical loaded portal section,an analysis of 3-D simulation in the excavation process of the Pingzhai tunnel is conducted by using the FLAC3D software.Comparing the middle horizontal adit excavation sequence with the common excavation sequence,the changes in deformation and stresses of surrounding rock of the Pingzhai tunnel in different excavation sequences are obtained.The results show that deformation and stresses of surrounding rock within 24 m from the portal are less those under middle horizontal adit excavation sequence,and the method is better. |
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| Keywords: | tunnelling engineering excavation sequence from inside shallow tunnel with unsymmetrical loadings portal section surrounding rock |
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