基坑开挖及降水作用下盾构隧道结构响应离心模型试验设计研究  

Study on the design of centrifuge model test to investigate the response of shield tunnel structures during foundation pit excavation and dewatering

作　　者：毛家骅 刘明高 陈仁东 张园 陆平 张晨阳 Mao Jiahua;Liu Minggao;Chen Rendong;Zhang Yuan;Lu Ping;Zhang Chenyang(China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Bejing General Municipal Engineering Design and Research Institute Co.,Ltd.,Bejing 100082,China;Beijing Jiaotong University,Bejing 100044,China;China First Highway Engineering Co.,Lid.,Bejing 100024,China;CCCC Tunnel Engineering Company Limited,Beijing 100102,China)

机构地区：[1]中国矿业大学,江苏徐州221116 [2]北京市市政工程设计研究总院有限公司,北京100082 [3]北京交通大学,北京100044 [4]中交一公局集团有限公司,北京100024 [5]中交隧道工程局有限公司,北京100102

出　　处：《土木工程学报》2024年第S1期184-189,共6页China Civil Engineering Journal

基　　金：中央高校基本科研业务费(2024QN11009);宁波市自然科学基金项目(2022J142)。

摘　　要：随着城市中心区域地下空间的持续开发,基坑工程施工邻近盾构隧道的状况越来越普遍。探明基坑开挖及降水对盾构隧道结构的影响规律是提出相应防护措施的关键。以超大直径盾构隧道工程为依托,开展了基坑开挖及降水作用下盾构隧道结构响应离心模型试验方案设计研究,确定了模型隧道管片衬砌材料和尺寸,考虑盾构隧道预制拼装管片结构特征,明确了管片纵缝两侧割槽的等效设计参数,环缝拼接及凹凸榫等效模拟方案,并验证衬砌环横向刚度,提出了基坑降水及适用于离心模型试验的“基坑内部抽水—外部补水伺服控制系统”设计方案,研究了模型地层尺寸对基坑底部涌水和基坑外部水位降的影响,验证了模型尺寸的合理性。可为同类型离心模型试验的设计提供参考。As urban central areas continue to develop underground spaces,the foundation pit engineering near shield tunnels is becoming increasingly important.Uncovering the pat-terns of impact on the tunnel structure due to excavation and dewatering in the pit is crucial for formulating appropriate protective measures.Based on the foundation of large-diameter tunnel engineering,a study was conducted to design a centrifuge model test for the response of shield tunnel structures under the influence of excavation and dewatering of foundation pit.The material and dimensions of the model tunnel lining were determined,taking into account the characteristics of precast and assembled shield tunnel lining.The equivalent design parameters for the longitudinal joints on both sides of the ring seam,as well as the equivalent simulation schemes for the circular joint and dovetail joints,were established.The transverse stffness of the lining ring was verified,and a design scheme for a"groundwater extraction and external water replenishment servo control system"suitable for the centrifuge model test was proposed.The impact of model layer size on the seepage of groundwater beneath the pit bottom and the reduction in external water levels was studied,verifying the rationality of the model size.The design of similar centrifugal model tests may serve as a reference.

关 键 词：盾构隧道 基坑开挖 降水 结构响应 离心试验 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]