植被敏感区超大断面地铁暗挖车站施工技术研究

Construction Technology of Subway Underground Excavation Station in Vegetation Sensitive Area

长沙地铁六号线烈士公园南站位于烈士公园园林内,属于植被敏感区,由于植被的特殊性,植被敏感区施工除了需要保证隧道整体施工安全外,还需减少隧道施工对植被的影响。针对该类情况,以保护植被及超大断面隧道施工的安全性为基准,提出了相关植被保护措施及在此基础上所形成的隧道施工工艺,包括如Ф159超前大管棚辅助施工技术、二衬台车拼装预埋吊环技术等措施,同时对现场施工期间进行监控量测,监控量测内容包括土壤张力、地下水位和地表沉降等,并对监测结果进行分析。该研究结果表明采取相关工艺后对现场施工控制隧道位移变形起重要作用,同时减少植被损失率,在后续施工过程中,需长期进行监控量测以确保植被正常生长。

Changsha Metro Line 6 Martyrs Park South Station is located in the martyrs’park garden and belongs to the vegetation sensitive area.Due to the particularity of vegetation,the construction of vegetation sensitive areas needs to ensure the safety of the overall construction of the tunnel and reduce the impacts of tunnel construction on vegetation.Based on the protection of vegetation and the safety of super-large section tunnel construction,relevant vegetation protection measures and tunnel construction techniques are proposed,which include auxiliary construction technology such asФ159 advanced large pipe shed,second lining trolley is assembled with measures such as the embedded ring technology,and at the same time,monitoring and measurement are performed during the construction of the site.The monitoring and measurement content includes soil tension,groundwater level,and ground subsidence,and the monitoring results are analyzed.The results indicate that the adoption of related technologies could play an important role in controlling the displacement and deformation of the tunnel during construction and reduce the vegetation loss rate.In the subsequent construction process,long-term monitoring and measurement are required to ensure the normal growth of vegetation.