复杂条件下连拱隧道洞口塌方成因及加固技术

发布时间：2018-01-10 14:31

本文关键词：复杂条件下连拱隧道洞口塌方成因及加固技术　出处：《湖南科技大学学报(自然科学版)》2014年01期 　论文类型：期刊论文

【摘要】：栎斜隧道是宁波象山港大桥公路中的一座双向四车道连拱隧道,出口段存在明显的偏压现象,围岩较破碎,地质条件复杂.左洞出口段遇大雨侵蚀后围岩变形突然增大,变形速率加快,致使洞口出现塌方.通过对塌方段主客观原因的分析,采用洞口刷坡、打设长管棚并喷射混凝土的综合方法加固处理.同时在处理段洞内增设监测断面进行周边收敛位移、拱顶下沉和地表沉降监测等监控手段,并与数值模拟结果对比分析.监控量测和数值模拟结果基本相同,表明处治措施得当,隧道洞口围岩基本趋于稳定,效果良好,为类似工程提供参考.
[Abstract]:Queshi tunnel is a two-way four-lane multi-arch tunnel in the highway of Ningbo Xiangshangang Bridge. The exit section has obvious bias phenomenon and the surrounding rock is relatively broken. The geological conditions are complicated. The deformation of the surrounding rock suddenly increases and the deformation rate accelerates after the heavy rain erodes at the exit of the left hole, which results in the collapse of the cave. Through the analysis of the subjective and objective reasons of the section, the slope is brushed by the hole mouth. At the same time, the monitoring section is added to monitor the peripheral convergent displacement, the dome subsidence and the ground subsidence monitoring and so on. Compared with the numerical simulation results, the results of monitoring measurement and numerical simulation are basically the same, which indicates that the treatment measures are appropriate, the surrounding rock of tunnel entrance tends to be stable, and the effect is good, which provides a reference for similar projects.
【作者单位】：湖南科技大学土木工程学院;中国中铁十六局集团有限公司;
【基金】：国家自然科学基金资助项目(41172255) 湖南科技大学研究生创新基金项目(S110106)
【分类号】：U457.3;U458.3
【正文快照】： 高速公路受场地条件以及地质条件的限制,特别是桥隧相连处接线困难,连拱隧道这一结构形式应运而生并得到了广泛应用.连拱隧道与分幅独立隧道比较,克服了地形和展线的限制,具有与公路连线容易、节省占地、保护环境、节省工程投资、外形美观等诸多优点[1-2].连拱隧道一般跨度大

【参考文献】