偏压地形土石交界地层隧道结构内力测试及支护措施研究  

The internal force of the supporting structure and surrounding rock failure analysis in the bias terrain soil-rock tunnel

作　　者：谢壮[1] 何金峰 石钰锋[1] 阳军生[1] 

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《工程勘察》2013年第5期23-27,共5页Geotechnical Investigation & Surveying

摘　　要：以沔渡隧道地形偏压土石交界过渡段为依托,采用现场测试和数值模拟手段,对土石交界过渡段隧道支护结构受力及围岩变形情况进行了现场测试与数值分析。研究结果表明:受地形偏压及围岩软硬不均的影响,钢拱架内力呈现不对称分布,不同台阶的施工转换引起钢拱架内力发生急剧变化,下台阶开挖后钢拱架受力变化明显,钢拱架存在向左下侧(土层侧)挤压的趋势,偏压作用明显。据此提出了土石交界地质隧道不对称支护措施,可为类似工程设计与施工提供参考。Based on the bias terrain transition section in Miandu Tunnel of Hunan expressway, using field test and numerical simulation, this article analysis the tunnel supporting structure forces and the deformation of surrounding rock in the embankment junction tunnel. The study shows that the internal force distribution of the steel arch frame is asymmetrical affected by the terrain distortion and the deformation of surrounding rocks; the transition of different terraces leads to a rapid and abrupt change in the internal force of steel arch frame; an obvious change in the steel frame emerges after the excavation of lower terrace; the steel frame tends to extrude to the left lower side of the soil horizon. The bias pressure influences obviously. An asymmetrical supporting approach to protect the tunnel in the boundary area of soil-rock is proposed which can provide a reference to similar engineering design and construction.

关 键 词：土石交界地层 隧道 内力测试 数值模拟 不对称支护 

分 类 号：TU457[建筑科学—岩土工程] U455.4[建筑科学—土工工程]