摘要
文章以软土地区运营地铁通缝拼装盾构隧道为分析对象，通过对运营7年的地铁隧道道床高程和沉降实测数据进行统计分析，系统研究了运营隧道纵向变形的分布特征及长期变化规律。研究表明，高程数据特征研究对于辅助评判运营隧道纵向变形和受力状态至关重要；运营前期，隧道沉降较快；随着时间推移，月均沉降逐步减小；全线隧道月均沉降量介于-2-2mm。隧道沉降发展规律与地层压缩变形和水位变化近似呈线性比例关系，地下水位回升，运营隧道月均沉降量减小，反之亦然。各区间隧道纵向变形曲线近似以旁通道为对称中心，呈高斯函数分布，最小高程在旁通道附近，反弯点在进出站附近；用于估算环缝错台纵向分布特征的每延米高程差曲线近似以旁通道为对称中心，呈反对称分布。
Using a metro shield tunnel with a continuously jointed segment lining in soft soil as the object of analy- sis, the distribution characteristics and long-term changing law of the longitudinal deformation of a metro tunnel that has been operating for 7 years were systematically studied based on a statistical analysis of the measured eleva- tion and settlement data of the track bed. The study results show that： 1） research on elevation data characteristics is essential to the auxiliary judgment of the longitudinal deformation and force state of the operating tunnel; 2） tunnel settlement occurred quickly at the beginning of operation; 3） as time passes, the average monthly settlement gradual- ly decreases; 4） for the whole line, the average monthly settlement is between -2 mm and 2 mm; 5） it is approximate- ly a linearly proportional relationship between the law of tunnel settlement development and formation compression deformation and groundwater level variations, which means the average monthly settlement of the operating tunnel decreases gradually with the rising of the groundwater level, and vice versa; 6） the longitudinal deformation curve of each running tunnel is distributed as a Gaussian function and its symmetric center is approximately the bypass pas- sage, with the minimum elevation near the bypass and the point of inflection near the entrance and exit of the sta- tion; and 7） the curve of elevation difference per linear meter to estimate the longitudinal distribution characteristics of the staggered hoop joint is asymmetrically distributed and centered approximately around the bypass.
出处
《现代隧道技术》
EI
CSCD
北大核心
2016年第5期25-30,共6页
Modern Tunnelling Technology
基金
国家自然科学基金项目(51508520)
河南省教育厅科学技术研究重点项目(14A560017)
关键词
软土
运营地铁
通缝拼装
盾构隧道
纵向变形
Soft soil
Operating metro
Erection of segment with continuous joint
Shield tunnel
Longitudinal defor-mation
