新建车站密贴下穿长期服役车站改扩建变形控制技术  

Deformation Control Technology for Reconstruction and Expansion of Newly Built Station Closely Undercrossing Long-Term Service Station

作　　者：刘兵科 麻建飞 贺家新 张斌 李益铭 刘夏冰[2,3] 贺少辉 LIU Bingke;MA Jianfei;HE Jiaxin;ZHANG Bin;LI Yiming;LIU Xiabing;HE Shaohui(BCEG Civil Engineering Co.,Ltd.,Beijing 100085,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Guangdong Hua-lu Transport Technology Co.,Ltd.,Guangzhou 510420,Guangdong,China)

机构地区：[1]北京建工土木工程有限公司,北京100085 [2]北京交通大学土木建筑工程学院,北京100044 [3]广东华路交通科技有限公司,广东广州510420

出　　处：《高压物理学报》2023年第2期167-178,共12页Chinese Journal of High Pressure Physics

基　　金：北京建工土木工程有限公司项目(KCL19055530)。

摘　　要：为保证新建车站密贴下穿服役近50年车站改扩建施工的安全稳定,开展了运营和预留车站的状态评估,依据结构状态制定了施工变形控制标准,借助数值模拟对比了不同扩建施工方案的影响,并结合现场实施验证了优选方案的效果。结果表明:先期建成车站结构存在装饰层掉落、混凝土开裂、剥落、碳化、钢筋腐蚀、底板渗漏水、区间积水及变形缝不均匀沉降等问题;交叉中隔壁法(central cross diagram,CRD)方案中预留3号线车站的最大沉降量为2.2 mm,地表沉降1.7 mm;洞桩法(pile beam arch,PBA)方案中车站的最大沉降量为1.3 mm,地表沉降1.1mm。综合考虑多种因素后,推荐在该改扩建工程中采用PBA施工方案。现场采用PBA施工方案后,2、3号线车站结构的最大竖向变形分别为-1.28和-1.01 mm,监测指标均在安全阈值内。研究结果可为类似长期服役改扩建工程提供参考。To ensure safety and stability of the reconstruction and expansion of the newly built station under a nearly 50 years long-term service station,the structural status of main structure and auxiliary structure of an operating station and a reserved station is inspected.The construction deformation control standard is formulated referring to the structural state.The construction impacts of different expansion construction schemes are compared by using numerical simulation.Then the effect of an optimized scheme is verified in combination with an on-site implementation.The results show that there is a series of problems in the earlybuilt station structure,such as decoration layer falling,concrete cracking,spalling,carbonization,steel corrosion,floor leakage,interval water accumulation and uneven settlement of deformation joints.For the CRD(central cross diagram)scheme,the maximum settlement of the reserved Line 3 station is 2.2 mm,and the surface settlement is 1.7 mm.For the PBA(pile beam arch)scheme,the maximum settlement of the station is 1.3 mm,and the surface settlement is 1.1 mm.The PBA method is recommended for the reconstruction and expansion project after a comprehensive consideration of various factors.After adopting the PBA construction scheme,the maximum vertical deformations of Line 2 and Line 3 structures are−1.28 and−1.01 mm,and the monitoring indicators are within the safety thresholds.The research results can provide a reference for similar subway station reconstruction and expansion projects.

关 键 词：隧道工程 长期服役车站 改扩建施工 结构状态检验 方案优选 

分 类 号：TU94[建筑科学—建筑技术科学]