大直径盾构下穿古井文物及密集建筑群施工技术

Construction Technology of Large Diameter Shield Tunneling Through Ancient Well Cultural Relics and Dense Buildings

文章结合广州市轨道交通二十二号线广州南站至陈头岗站区间盾构施工,针对大直径盾构在节理带地层中浅覆土、长距离下穿密集房屋群的施工难题,采用微动探测新技术解决了密集建筑群场地狭窄、外部干扰等条件限制无法进行地勘钻孔的痛点;选择试验段优化掘进参数,改进注浆工艺,实时监测沉降,地质雷达扫描等措施,解决了古井水源裂隙易破坏,建筑物扰动易沉降、开裂的难题,为类似工程提供了参考。

Based on the construction of shield tunnels between Guangzhou South Station and Chentougang Station on Guangzhou Rail Transit Line 22,aiming at the construction problems of large-diameter shield tunneling in the joint zone with shallow overburden and long-distance penetration of dense housing groups,the new micro-motion detection technology is used to solve the pain points of geological exploration and drilling due to the narrow site of the dense building group and external interference.The test section is selected to optimize the excavation parameters,improve the grouting technology,and carry out real-time monitoring of settlement,geological radar scanning and other measures.It solves the problem of easy destruction of ancient well water source fissures,and easy settlement and cracking of buildings when disturbed,which provides a reference for similar projects.