摘要
盾构隧道管片裂缝、破损及错台等病害会对结构产生不利影响。文章以西安地铁某区间盾构隧道涌水事故为工程背景,通过采用现场调查、GPR探测、超声波裂缝检测及位移量测等方法,系统分析了涌水导致的病害状态及其原因。分析结果表明:涌水事故初期管片周围形成空洞以及管片承受不均匀松散荷载,使得管片破损;作用在管片上的注浆压力引起非对称附加荷载,管片向隧道内侧移动,至注浆结束管片累计横向位移达3.4 cm,上浮量达5.5 cm,最终导致了管片破损和位移;管片裂缝最大深度134.9 mm,最大宽度1.0 mm。研究结果可为管片裂缝病害处治及机理研究提供依据,为盾构隧道的设计与施工提供借鉴。
Segment defects like cracking, damage and dislocation have extremely adverse effects on shield tunnels. Using the water inflow event of a shield tunnel on the Xi＇an metro as an example, this paper analyzes the situations and relevant causes of segment defects by utilizing field surveys, GPR detection, ultrasonic crack detection, displacement measurement, etc. The results show that： 1） the damages occurred on the segment at an early stage due to the cavities formed around the segment ring and the irregularly distributed loads upon it; 2） the displacements occurred on the segment because of additional asymmetric loading caused by grouting pressure, the cumulative lateral displacement of which was 3.4 cm with the upward movement reaching 5.5 cm at the end of grouting; and 3） the maximum depth of segment crack was 134.9 mm and its maximum width was 1.0 mm.
出处
《现代隧道技术》
EI
CSCD
北大核心
2015年第2期186-191,共6页
Modern Tunnelling Technology
基金
国家自然科学基金资助项目(No.50808020)
关键词
盾构隧道
管片裂缝
监测分析
病害
涌水
Shield tunnel
Segment crack
Monitoring analysis
Defect
Water inflow
