近接基坑施工对既有隧道气囊桩的保护效果研究
PDF下载 (236)倪福兴,叶俊能,陆 幸,刘干斌.近接基坑施工对既有隧道气囊桩的保护效果研究[J].宁波大学学报(理工版),2023,36(5):44-50.DOI:10.20098/j.cnki.1001-5132.2023.0417
NI Fuxing,YE Junneng,LU Xing,LIU Ganbin.Protection of metro tunnel by airbag pile in construction of adjacent foundation pit[J].Journal of Ningbo University(Natural Science & Engineering Edition),2023,36(5):44-50.DOI:10.20098/j.cnki.1001-5132.2023.0417
| Title: | Protection of metro tunnel by airbag pile in construction of adjacent foundation pit |
| 作者: | 倪福兴, 叶俊能, 陆 幸, 刘干斌 |
| Author(s): | NI Fuxing, YE Junneng, LU Xing, LIU Ganbin |
| 关键词: | 近接基坑; 高压气囊桩; 既有隧道; 计算模型 |
| Keywords: | adjacent foundation pit; high-pressure airbag pile; existing tunnel; model |
| 分类号: | U457 |
| DOI: | 10.20098/j.cnki.1001-5132.2023.0417 |
| 文献标识码: | A |
| 摘要: | 为研究高压气囊桩的布设方式对既有隧道的保护效果, 以JD08地块基坑施工对宁波轨道交通3号线区间隧道的影响为例, 通过建立基坑开挖对隧道影响的二维计算模型, 计算分析了气囊桩与隧道距离、气囊桩埋深、气囊桩加载压力对隧道水平和竖向位移以及其整体结构的影响, 并与实测结果进行对比. 结果表明: 计算结果与实测结果较为接近, 基坑设计方案满足地铁保护要求; 气囊桩加载后, 隧道出现挤压回弹, 基坑开挖引起的隧道水平位移有所减小; 随着气囊桩长度的增加, 挤压作用更为明显, 隧道水平位移减小, 隆起增大, 横向收敛增大; 气囊桩与隧道间距以3m为宜, 气囊压力以800kPa为宜. |
| Abstract: | High pressure airbag pile is a new technology for metro protection. In order to study the protection effect of high pressure airbag pile arrangement on existing tunnel, the influence of foundation pit on Ningbo Rail Transit Line 3 tunnel in JD08 is taken as an example, whereby a two-dimensional calculation model of the influence of foundation pit excavation on the tunnel is established, the effects of the distance between the airbag pile and the tunnel, the buried depth of the airbag pile and the loading pressure of the airbag pile on the tunnel deformation are calculated and analyzed, and the calculated results are compared with the measured results. The results show that the calculated results are close to the measured results, and the design scheme of the foundation pit meets the requirements of metro protection. The tunnel extrusion rebound occurs after the airbag pile is loaded, and the tunnel horizontal displacement caused by foundation pit excavation decreases, with the increase of airbag pile length, the tunnel horizontal displacement decreases, the uplift increases, and the lateral convergence increases. It is preferred the distance between airbag pile and tunnel to be 3 m, and the airbag pressure to be 800 kPa. |
| 参考文献 /References: | [1] 李连祥, 张强, 石锦江, 等. 基坑开挖邻近隧道水平形变位移规律[J]. 山东大学学报(工学版), 2021, 51(1):46-52; 59. [2] 温忠义, 张丽娟, 陈松, 等. 基坑支护结构变形对邻近地铁隧道的影响研究[J]. 路基工程, 2014(5):144-148. [3] 郑刚, 王琦, 邓旭, 等. 不同围护结构变形模式对坑外既有隧道变形影响的对比分析[J]. 岩土工程学报, 2015, 37(7):1181-1194. [4] 陈仁朋, 孟凡衍, 李忠超, 等. 邻近深基坑地铁隧道过大位移及保护措施[J]. 浙江大学学报(工学版), 2016, 50(5):856-863. [5] Chen R P, Meng F Y, Li Z C, et al. Investigation of response of metro tunnels due to adjacent large excavation and protective measures in soft soils[J]. Tunnelling and Underground Space Technology, 2016, 58:224-235. [6] 张治国, 徐晨, 刘明, 等. 考虑基坑降水开挖影响的运营隧道变形分析[J]. 中国矿业大学学报, 2015, 44(2):241-248. [7] Zheng G, Wang F J, Du Y M, et al. The efficiency of the ability of isolation piles to control the deformation of tunnels adjacent to excavations[J]. International Journal of Civil Engineering, 2018, 16(10):1475-1490. [8] Kontogianni V A, Stiros S C. Induced deformation during tunnel excavation: Evidence from geodetic monitoring[J]. Engineering Geology, 2005, 79(1/2):115-126. [9] 郑刚, 潘军, 程雪松, 等. 基坑开挖引起隧道水平变形的被动与注浆主动控制研究[J]. 岩土工程学报, 2019, 41(7):1181-1190. [10] 孙文昊, 范东方, 胡威东, 等. 新建地下通道时下方地铁隧道保护方案研究[J]. 铁道工程学报, 2019, 36(12):86-91. [11] 王康任, 庞小朝, 顾问天, 等. 基岩注浆截水帷幕在城市40m超深基坑工程及紧邻地铁保护中的应用[J]. 土木工程学报, 2020, 53(S1):220-225. [12] 周丁恒, 田雪娟, 李长安, 等. 暗挖地铁隧道下穿高速铁路隧道保护措施研究[J]. 重庆交通大学学报(自然科学版), 2021, 40(9):86-91; 108. [13] 郦亮, 刘干斌, 陆幸, 等. 邻近基坑开挖地铁隧道的注浆保护试验与数值模拟[J]. 地下空间与工程学报, 2021, 17(S1):387-396. [14] Zheng G, Su Y M, Diao Y, et al. Field measurements and analysis of real-time capsule grouting to protect existing tunnel adjacent to excavation[J]. Tunnelling and Underground Space Technology, 2022, 122:104350. [15] 倪福兴, 叶俊能, 刘干斌, 等. 近接基坑开挖对既有隧道变形影响及控制研究[J]. 防灾减灾学报, 2023, 39(1):53-61. |
| 备注/Memo: | 收稿日期: 2023－04－17. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 国家自然科学基金（52008214）; 宁波市科技计划公益项目（202002N3116）. 第一作者: 倪福兴（1998－）, 男, 浙江杭州人, 在读硕士研究生, 主要研究方向: 软土地下工程. E-mail: 931824756@qq.com *通信作者: 刘干斌（1976－）, 男, 江西新干人, 教授, 主要研究方向: 软土地下工程. E-mail: liuganbin@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
