全地下空间枢纽深基坑支护结构变形特征控制  

Deformation Characteristics Control of Deep Foundation Pit Support Structure in Full Underground Space Hub

作　　者：王强 宋歌 廖利 刘国伟 蔡崇德 WANG Qiang;SONG Ge;LIAO Li;LIU Guowei;CAI Chongde(China Railway Construction Group Co.,Ltd.,Beijing 100040,China;China Railway Construction Administration Corporation,Beijing 100038,China)

机构地区：[1]中铁建设集团有限公司,北京100040 [2]中国铁路建设管理有限公司,北京100038

出　　处：《铁路技术创新》2024年第3期178-185,共8页Railway Technical Innovation

摘　　要：雄安小里站交通枢纽超大深基坑工程,长1.05 km,深达28 m,具有富水地层、复杂地质等工程特点,属复杂超大深基坑工程,安全风险等级高。为保证基坑在开挖施工阶段安全稳定,依托雄安小里站交通枢纽超大深基坑工程,研究采用数值模拟方法,围绕双排桩施工方法与加固措施,设计3种不同的模拟方案,探讨在不同支护加固方案下,基坑整体的受力变形特征。模拟结果显示:运用“双排桩+桩前基底局部加固”支护方案,增强了双排桩支护结构的刚度,同时较好地控制了桩体水平位移,使桩顶水平位移减少48%。实测数据验证表明:基坑双排桩支护优化方案及相应的加固处理措施能有效加固优化类似深基坑,保障了基坑工程安全施工。The Super-large Deep Foundation Pit Project of Xiongan Xiaoli Railway Station Transportation Hub,with a length of 1.05 km and a depth of 28 m,has the engineering characteristics of water-rich strata and complex geology,and belongs to a complex super-large deep foundation pit project with high safety risk level.In order to ensure the safety and stability of the foundation pit in the excavation stage,relying on the Super-large Deep Foundation Pit Project of Xiongan Xiaoli Railway Station Transportation Hub,3 different simulation schemes are designed around the double-row pile construction methods and reinforcement measures by using numerical simulation method,and the overall stress deformation characteristics of the foundation pit under different support and reinforcement schemes are discussed.The simulation results show that the support scheme of“double-row piles+local reinforcement of foundation base in front of piles”enhances the rigidity of doublerow pile supporting structure,and controls the horizontal displacement of piles,reducing the horizontal displacement of pile top by 48%.The verification of measured data shows that the optimized double-row pile support scheme for foundation pit and the corresponding reinforcement measures can effectively reinforce and optimize similar deep foundation pits,thus ensuring the safe construction of foundation pit engineering.

关 键 词：地下交通枢纽 深基坑 双排桩 支护结构 变形控制 数值模拟 

分 类 号：U217[交通运输工程—道路与铁道工程] TU9[建筑科学]