一种地下工程底板主-被动联合抗浮治理方法  

An Active-Passive Coupled Method to Treat Insufficient Anti-Floating of Basement Floor for Urban Underground Engineering

作　　者：吴行州 WU Hangzhou(The Fourth Engineering Co.Ltd.of China Railway 23rd Bureau Group,Chengdu Sichuan 610091,China)

机构地区：[1]中铁二十三局集团第四工程有限公司,四川成都610091

出　　处：《铁道建筑技术》2024年第5期152-156,共5页Railway Construction Technology

基　　金：中铁二十三局集团第四工程有限公司科技研究开发计划项目(2017-01)。

摘　　要：抗浮不足是我国城市地下工程运营期最常见的严重病害之一,及时有效治理底板抗浮问题具有重要的工程价值和社会意义。当地下工程内部净空高度明显不足时,传统配重法因需占用一定室内净空高度而难以应用,而锚杆增设抗浮不仅成本高还会一定程度上损伤既有底板,亟须研究一种新型方法来治理既有底板抗浮不足难题。以南充市某城市下穿隧道为例,针对地下工程内部净空受限特殊条件,研究提出了一种以抗浮预应力混凝土增强底板作为主动抗浮措施、以底板临时增重为被动抗浮措施的主-被动联合抗浮方法来治理底板抗浮不足病害,取得了良好的工程应用效果。The insufficient anti-floating of the basement floor is a common problem in existing urban underground engineering.Timely and effective treatment of the related problems is of significant importance to both underground engineering itself and urban public safety.However,traditional weight increase with high density concrete cannot be employed because of the limited clear height of the basement,and installing additional anti-floating anchors/piles is also not applicable due to the potential damage to the basement floor.Therefore,a suitable solution is highly expected to address the insufficient anti-floating problem of the basement floor.When the clear height of the basement is close to the minimum statutory level,this paper proposes a new active-passive coupled treatment method to repair the anti-floating of the basement floor on the basis of an existing urban tunnel in Nanchong,Sichuan.In this work,pre-stressed concrete as the active anti-floating measure is utilized to strengthen the basement floor,and increasing the floor weight temporarily as the passive anti-floating measure to enhance the anti-floating capacity of the basement when the groundwater level rises sharply.The proposed method has successfully addressed the anti-floating of the existing city tunnel in Nanchong,and a favorable quality is achieved accordingly.

关 键 词：城市地下工程 抗浮不足 预应力混凝土抗浮 底板增重 主-被动联合抗浮 

分 类 号：U457.2[建筑科学—桥梁与隧道工程]