安紫高速跨越既有高铁隧道跨线方案比选  

Comparisons of Line-cross Schemes of Anshun-Ziyun Highway Project Cross Existing High-speed Railway Tunnel

作　　者：杨洪[1] 

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵阳550081

出　　处：《交通科技》2015年第6期48-51,共4页Transportation Science & Technology

摘　　要：拟建安紫高速横跨既有山岚桥高铁隧道,不同的跨线方案对下方既有隧道结构产生不同影响。基于Midas/GTS有限元软件进行建模计算,分析了4种跨线桥方案运营荷载对高铁隧道结构的影响。结果表明,运营期荷载作用下对隧道周围地层应力的影响和隧道应力影响由大到小依次为扩大基础40m中跨方案、路基方案、37m桩基础40m单跨方案、37m桩基础40m中跨方案。结合前期施工揭露的地质情况、对隧道的影响、施工方案和工期要求的分析,提出了不同的方案选择建议。The An-Zi highway project crosses existing Shanlanqiao high-speed railway tunnel and line- cross schemes may have different effects on existing tunnel underneath. Operation period load effects of two flyover schemes and a subgrade scheme on the tunnel are analyzed based on Midas/GTS finite element software. The result shows that decreasing order of effects on ground stress and tunnel struc- ture stress is flyover scheme with spread foundation, subgrade scheme, flyover scheme with 37 m- depth pile and 40m span, and flyover scheme with 37 m-depth pile and 40 m-midspan. According to uncovered geological conditions and the analysis of effect on tunnel, construction program and period costs, proposals of schemes selection are gained.

关 键 词：跨线方案 既有高铁隧道 有限元计算 

分 类 号：U451[建筑科学—桥梁与隧道工程]