公路偏压隧道量测与有限元模拟分析.pdfVIP

8 1 Vol8 No1 2011 2 JOURNAL OF RA ILWAY SC IENCE AND ENG INEER ING Feb. 2011 * (湖南省娄新高速公路建设开发有限公司, 湖南长沙 410011) : 针对公路偏压隧道, 利用有限元对高速公路隧道左线出口 施工全过程进行动态模拟有限元模型中隧道初次衬 砌及钢拱架采用直梁单元锚杆采用锚杆单元进行模拟并对该公路隧道施工过程中进行现场监控量测, 对某些区域变形 异常阐明了原因通过量测数据与有限元模拟分析结果对比分析, 研究了偏压作用下隧道施工过程中围岩位移的变化规 律, 阐述了现场监控量测与有限元仿真模拟相结合的方法对实现隧道信息化施工的重要性, 为优化设计参数, 调整施工工艺 提供了依据 : 偏压隧道;监控量测; 有限元模拟; 信息化施工 : TU457 : A : 1672- 7029( 2011) 01- 0082- 05 Dynam ic monitoring an fem smi ulation analysis of an expressway tunnelw ith unsymmetrical loa ings XIAO Jianqiu (Hunan Lou- X in xpressway Construction and D evelopment L td. , Changsha 410011, China) Abs tract: Based on the finite elem entmethod, the dynam ic construction procedure of the left entrance of one tun nel on expressway was smi ulated and the deform ation behaviors of the tunnelwere studied. In the F M mode,l the anchors are smi ulatedw ith the anchorage elements, while the cement lining and the steel- arc shelfwere smi ulated w ith the straight beam elements. The causes of abnorm ity deformation in some zoneswere presented. Fur thermore, the tmi e series of in- situmeasures for the entrance of one tunnel on expresswaywere performed so as to verify the F M smi ulation validity. A ccording to the comparison of the F M calculation results and the ob served data, it is showed that the deformation behavior of the surrounding rockmass is controlled by unsymmetri cal loadings during the process of construction. It is proposed that not only the in- situ dynam ic measurem ents but also the anal