OPTIMIZATION OF PRECAUTIONARY MEASURES TO UNSYMMETRICAL PRESSURE OF LARGE-SECTION TUNNEL

机译：大型断面隧道非对称压力的预防措施的优化

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Shenghongqing tunnel is a double-line railway tunnel under complex geological conditions, which double-decker container train can be crossed. As the angel between the tunnel axes and the strike of hillside is small, unsymmetrical pressure will loaded on the support after excavation. In order to reduce problems during construction, precautionary measures are drafted by the suggestions of experts and field practice. Precautions consist of two parts, one is forepoles and injection to reinforce rock ahead of the advancing face, the other is backfill hillside to minish the unsymmetrical pressure. Based on geological conditions, 4 backfill schemes are proposed, which have different quantities. Tunnel is simplified a problem of plane strain, FEM(Finite Element Methods) is used to optimize schemes. Computational results show that the maximums of inner forces and displacements decrease before increase with the increment of backfill quantities. By the contrast analysis, an efficient scheme is selected. Finally, by monitoring of the convergence displacements of tunnel, the effect of precaution measures is proved.

机译：胜洪清隧道是地质条件复杂的双线铁路隧道，可以穿越双层集装箱列车。由于隧道轴线与山坡走向之间的角度较小，因此开挖后支护上会承受不对称压力。为了减少施工过程中的问题，专家和现场实践的建议起草了预防措施。预防措施包括两部分，一部分是前掌和注水以加固前进面之前的岩石，另一部分是回填山坡以减小不对称压力。根据地质条件，提出了数量不同的4种回填方案。隧道简化了平面应变问题，使用有限元法（FEM）来优化方案。计算结果表明，内力和位移的最大值在回填量增加之前先减小。通过对比分析，选择了有效的方案。最后，通过监测隧道的收敛位移，证明了预防措施的效果。

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来源
《第一届现代铁路创新与可持续发展国际会议（The First International Symposium on Innovation amp; Sustainability of Modern Railway）》|2008年|233-239|共7页
会议地点 Nanchang(CN);Nanchang(CN)
作者
Geng Daxin; Zhang Weihong; Yu Denghua; Zheng Mingxin;
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作者单位

School of Civil Engineering and Architecture Departments, East China Jiaotong University, Nanchang, 330013, China;

CREC Electrification Bureau Xian Railway Engineering Co.,LTD, Xi'an, 710032, China;

Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China;

School of Civil Engineering and Architecture Departments, East China Jiaotong University, Nanchang, 330013, China;

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原文格式 PDF
正文语种 eng
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关键词
unsymmetrical pressure; large-section tunnel; backfill; scheme optimization; numerical simulation;

机译：非对称压力；大断面隧道；回填；方案优化；数值模拟;

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OPTIMIZATION OF PRECAUTIONARY MEASURES TO UNSYMMETRICAL PRESSURE OF LARGE-SECTION TUNNEL

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