湖域明挖隧道深基坑开挖与支护稳定分析  

Stability Analysis of Deep Foundation Pit Excavation and Support of Yangcheng West Lake Open Cut Tunnel

作　　者：胡健 张瑞坤 石名磊[3] 田新涛[3] HU Jian;ZHANG Ruikun;SHI Minglei;TIAN Xintao(Jiangsu Xiandai Road&Bridge Co.,Ltd.,Nanjing 210000,China;Jiangsu Huaning Engineering Consulting Co.,Ltd.,Nanjing 210018,China;School of Transportation,Southeast University,Nanjing 210096,China)

机构地区：[1]江苏现代路桥有限公司,江苏南京210000 [2]江苏华宁工程咨询有限公司,江苏南京210018 [3]东南大学交通学院,江苏南京210096

出　　处：《佳木斯大学学报（自然科学版）》2024年第2期97-101,共5页Journal of Jiamusi University：Natural Science Edition

基　　金：国家自然科学基金(51978159);“十二五”国家科技支撑计划(2015BAB07B06)。

摘　　要：阳澄湖隧道基坑工程具有土方开挖量大、地质条件差以及所处位置特殊,紧靠京沪高铁丹昆特大桥的特点,严重影响基坑开挖安全和开挖进度。工程设计采用分级放坡开挖,边坡采用网喷+土钉联合支护结合井点降水的开挖支护方案。针对基坑稳定问题,采用理正岩土软件对基坑边坡两个典型断面的整体稳定性、抗隆起稳定性和抗突涌稳定性进行验算。同时使用FLAC3D数值模拟软件对基坑开挖过程进行了模拟,对基坑开挖引起的地表沉降、边坡变形、塑性区开展等结果进行计算,验证了基坑施工的稳定性。The foundation pit engineering of Yangcheng Lake tunnel is characterized by large amount of earthwork excavation,poor geological conditions and special location,which is close to dankun super large bridge of Beijing Shanghai high speed railway,seriously affecting the safety and progress of foundation pit excavation.The engineering adopts the excavation by grading,and the slope adopts the excavation and support scheme of mesh spraying+soil nailing combined with well point dewatering.In view of the prominent problem of foundation pit stability,geotechnical calculation software Lizheng is used to check the overall stability,anti uplift stability and anti surge stability of two typical sections of foundation pit slope.At the same time,the process of foundation excavation was also simulated by using FLAC3D numerical simulation software.The results of surface settlement,slope deformation and plastic zone development caused by foundation pit excavation are calculated to verify the stability of foundation pit construction.

关 键 词：明挖隧道 深基坑 整体稳定性 数值模拟 FLAC3D 

分 类 号：TU473[建筑科学—结构工程]