基坑降水对邻近桥下道路的影响及防治措施  

Influence and Treatment of Dewatering of Foundation Pit on Adjacent Road under the Bridge

作　　者：胡斌[1] 李小青[1] 张玉 HU Bin;LI Xiao-qing;ZHANG Yu(School of Civil Engineering and Mechanics,Huazhong University of Science and Technology,Wuhan430074,China;Xinyang Construction Engineering Quota Management Station,Xinyang 450000,China)

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]信阳市建设工程标准定额管理站,河南信阳450000

出　　处：《水电能源科学》2019年第6期99-102,共4页Water Resources and Power

基　　金：武汉市建委科研项目(2015-44)

摘　　要：某基坑开挖降水导致邻近桥下道路产生了较大的不均匀沉降,影响行车安全。采用Midas GTS软件建立该基坑施工的数值仿真模型,考虑地下水渗流对沉降的影响,分析基坑开挖降水对道路的影响机制及沉降控制措施。结果表明,当降水深度超过6m时,邻近桥下道路开始出现沉降,桥墩承台与道路过渡段的不均匀沉降尤其明显,且随着施工的推进,道路路面沉降变大,影响范围变广。为防止道路进一步破坏,采用土工格室加筋处治道路不均匀沉降问题。实际沉降观测表明,采用土工格室加筋法处治后,道路沉降速率降低,防治效果较为明显。The excavation and dewatering of foundation pit leads to uneven settlement of the adjacent road,which affects the traffic safety.Considering the seepage of groundwater,the Midas GTS software was used to set up the numerical simulation model to investigate the influence effect and control measures of excavation and dewatering of foundation pit on road settlement.The results show that the settlement of road appears after the depth of excavation more than 6 m.Especially the uneven settlement of the junction between pier caps and road is pronounced.With construction process,the settlement of road surface is larger,and the influence scope is wider.To prevent the road surface from further damage,the uneven settlement of the road is treated with geo cell reinforcement.The monitor results of settlement shows that with the treatment of geo cell reinforcement on adjacent road,the settlement rate of the road decreases after the construction of deep foundation pit is completed,and the treatment effect is remarkable.

关 键 词：基坑开挖降水 路面不均匀沉降 过渡段 数值仿真 土工格室 

分 类 号：TV473[水利工程—水工结构工程]