基于长期沉降运营地铁隧道健康诊断

发布时间：2019-06-12 07:49

【摘要】：目的研究上海轨道交通二号线某区间地铁隧道运营期间的健康状况并进行诊断,得出实际运营地铁隧道不同时间不同区段的曲率半径分布规律.方法以盾构隧道的长期沉降为基础,从地铁隧道长期沉降出发,采用非均匀有理B样条法对隧道纵向沉降变形曲线进行拟合,并计算出相应曲率半径;然后通过修正的等效连续化模型,计算出5种临界状态下的隧道曲率半径及其他变形受力指标值.结果上海市地铁该区间隧道绝大部分测点处于《上海市地铁沿线建筑施工保护地铁技术管理暂行规定》的地铁安全运营的要求范围内,即曲率半径不小于15 000 m;几乎所有测点均满足盾构管片抵抗0.5 MPa水压的环缝张开量要求,即曲率半径大于2 550 m;随着地铁运营时间的增长,隧道曲率半径分布集中的现象有所削弱,说明隧道不均匀沉降状况逐渐加剧;地铁区间中位于车站和中间旁通道之间的区域,曲率半径分布集中,隧道不均匀沉降现象不太明显;靠近车站和中间旁通道附近区域,曲率半径分布相对分散,隧道不均匀沉降现象较为严重.结论系统地对弹性和塑性状态下的隧道纵向等效连续化模型进行了修正,完成了从具体指标上定量地对地铁运营隧道的健康状况进行诊断,对于城市地铁隧道运营监控具有指导意义.
[Abstract]:Objective to study the health status and diagnosis of subway tunnel in a certain section of Shanghai Rail Transit Line 2, and to obtain the distribution of curvature radius in different sections of subway tunnel at different time. Methods based on the long-term settlement of shield tunnel and the long-term settlement of subway tunnel, the longitudinal settlement deformation curve of tunnel is fitted by non-uniform rational B-strip method, and the corresponding curvature radius is calculated, and then the curvature radius and other deformation force index values of tunnel under five critical conditions are calculated through the modified equivalent continuum model. Results most of the measuring points of the tunnel in this section of Shanghai Metro are within the requirements of the interim regulations of Construction Protection Metro Technology Management along the Shanghai Metro, that is, the curvature radius is not less than 15 000 m, and almost all the measuring points meet the requirements of shield segment to resist 0.5 MPa water pressure, that is, the curvature radius is more than 2 550 m, that is, the curvature radius is more than 2 550 m, that is, the curvature radius is more than 2 550 m, that is, the radius of curvature is more than 2 550 m. With the increase of subway operation time, the phenomenon of concentrated curvature radius distribution of tunnel is weakened, which indicates that the uneven settlement of tunnel is gradually aggravated; in the area between station and middle side channel, the distribution of curvature radius is concentrated, and the phenomenon of uneven settlement of tunnel is not obvious; near the area near the station and the middle side channel, the distribution of curvature radius is relatively dispersed, and the phenomenon of uneven settlement of tunnel is more serious. Conclusion the longitudinal equivalent continuum model of tunnel in elastic and plastic state is systematically modified, and the health status of subway tunnel is diagnosed quantitatively from the specific index, which is of guiding significance for the operation and monitoring of urban subway tunnel.
【作者单位】：同济大学地下建筑与工程系;中国建筑科学研究院地基基础研究所;
【基金】：国家重点基础研究发展计划(973计划)项目(2011CB013800)
【分类号】：U457;U231.94

【共引文献】