大跨度隧道三台阶临时仰拱钢架拆除分析  

ANALYSIS OF STEEL FRAME REMOVAL OF THREE STEPS TEMPORARY INVERT IN LONG-SPAN TUNNEL

作　　者：吴超俊 WU Chaojun(Power China Zhongnan Engineering Corporation Ltd,Changsha 410014,China)

机构地区：[1]中国电建集团中南勘测设计研究院有限公司,长沙410014

出　　处：《低温建筑技术》2024年第7期120-123,共4页Low Temperature Architecture Technology

摘　　要：大跨度隧道偏压地段和软弱岩层等施工条件较差地段一般采用三台阶临时仰拱设临时钢架法施工,三台阶临时仰拱设临时钢架法下一个台阶开挖需对上一台阶的临时支撑进行拆除,临时支撑的拆除顺序对隧道衬砌结构的受力影响较大,通过对三台阶临时仰拱法设临时钢架工法施工过程进行数值模拟计算,分析临时支撑钢架的不同拆除顺序下隧道初支变形,并结合现场监控量测数据进行对比分析,确定合理的临时钢架拆除顺序,为工程实践提供理论指导。In the section with poor construction conditions such as biased section and weak rock stratum,the three-step temporary invert with temporary steel frame method is generally adopted for construction.The excavation of the next step with the three-step temporary invert with temporary steel frame method requires the removal of the temporary support of the previous step,and the removal sequence of the temporary support has a great influence on the stress of the tunnel lining structure.Through the numerical simulation calculation of the construction process of the temporary steel frame with the three-step temporary invert method,the initial tunnel support deformation under different removal sequences of the temporary steel frame is analyzed,and the reasonable removal sequence of the temporary steel frame is determined according to the comparison and analysis of the on-site monitoring and measure⁃ment data,providing theoretical guidance for engineering practice.

关 键 词：大跨度隧道 三台阶临时仰拱法 临时支撑 

分 类 号：TU391[建筑科学—结构工程]