软硬交界隧道近距离下穿建筑物注浆控制及监测管理
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摘要
城市浅埋隧道在砂类土与基岩交界地层中近距离下穿建筑物,受上部建筑超载、下部基岩爆破扰动等因素的影响,极易诱发各类安全事故。以青岛地铁区间下穿商业建筑为工程依托,通过对地质条件及工程资料的深入分析,提出了"复合锚杆桩+超前深孔注浆+强化补偿注浆"的联合注浆加固技术,并通过精细化数值模拟与现场监测验证,分析了浅埋隧道穿越施工的结构与地层变形规律。结果表明:在基岩上部的软弱砂层中进行高压注浆,易诱发隧道上部的地层出现"M"形抬升变现,导致基础与梁柱构件形成由两边至中间折弯的正曲率形态;超前深孔注浆是改善施工面前方地质条件的重要措施,虽然注浆引起上部地层产生持续隆升,但总体变形量仍在可控限值内;在施工影响敏感区域开展现场监测管理,能够识别和规避地下工程现场作业中出现的不利因素,对注浆工艺和注浆参数进行反向调控,减小因注浆引起的建筑和地基变形问题。
The shallow buried tunnel in the city passes through the building closely in the boundary layer between sand soil and bedrock. Based on the project of subway undergoes commercial building of Qingdao,the of geological conditions and engineering data is deep analyzed,the joint grouting reinforcement technology of"compound anchor pile + advanced deep hole grouting + reinforced compensated grouting"is put forward. Through fine numerical simulation and field monitoring verification,the structure and formation deformation rules of shallow buried tunnel crossing construction are analyzed. The results show that high pressure grouting in the soft sand layer on the upper part of the bedrock can easily induce the stratum on the upper part of the tunnel to realize the "M"type uplift,resulting in the positive curvature of the foundation and the beam and column members bending from both sides to the middle. Advanced deep hole grouting is an important measure to improve the geological conditions before construction. Although grouting causes continuous uplift of the upper strata,the overall deformation is still within the controllable limit. On-site monitoring and management in sensitive areas affected by construction can identify and avoid the adverse factors in underground engineering site operation,reverse control the grouting process and grouting parameters,and reduce the building and foundation deformation problems caused by grouting.
The shallow buried tunnel in the city passes through the building closely in the boundary layer between sand soil and bedrock. Based on the project of subway undergoes commercial building of Qingdao,the of geological conditions and engineering data is deep analyzed,the joint grouting reinforcement technology of"compound anchor pile + advanced deep hole grouting + reinforced compensated grouting"is put forward. Through fine numerical simulation and field monitoring verification,the structure and formation deformation rules of shallow buried tunnel crossing construction are analyzed. The results show that high pressure grouting in the soft sand layer on the upper part of the bedrock can easily induce the stratum on the upper part of the tunnel to realize the "M"type uplift,resulting in the positive curvature of the foundation and the beam and column members bending from both sides to the middle. Advanced deep hole grouting is an important measure to improve the geological conditions before construction. Although grouting causes continuous uplift of the upper strata,the overall deformation is still within the controllable limit. On-site monitoring and management in sensitive areas affected by construction can identify and avoid the adverse factors in underground engineering site operation,reverse control the grouting process and grouting parameters,and reduce the building and foundation deformation problems caused by grouting.
引文
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2 郑劲松,蒋新华,谢志军.基于数据仓库的城市轨道交通客流分析[J].科学技术与工程,2009,9(6):1592-1596Zheng Jinsong,Jiang Xinhua,Xie Zhijun. Passenger flow analysis of urban rail transit based on data warehouse[J]. Science Technology and Engineering,2009,9(6):1592-1596
3 Nguyen Q P,Nguyen V M,Konietzky H,et al. Numerical simulation of the influence of water inrush on underground coal mining stability in vietnam[J]. Mine Planning and Equipment Selection,2014,38:629-636
4 李团社.西安地铁穿越地裂缝带线路与轨道工程方案研究[J].铁道工程学报,2009,26(12):81-85Li Tuanshe. Study on the project scheme of Xi'an subway crossing ground fissure belt[J]. Journal of Railway Engineering,2009,26(12):81-85
5 曾晓鑫,丁文湘,彭玲,等.深基坑开挖时隔离桩位置对邻近既有地铁隧道的变形分析[J].科学技术与工程,2017,17(14):301-306Zeng Xiaoxin,Ding Wenxiang,Peng Ling,et al. Analysis of deformation of adjacent existing subway tunnel by isolation pile during excavation of deep foundation pit[J]. Science Technology and Engineering,2017,17(14):301-306
6 Jenck O,Dias D. 3D-finite difference analysis of the interaction between concrete building and shallow tunneling[J]. Geotechnique,2004,54(8):519-528
7 耿城.地铁隧道近距离侧穿建筑物隔离防护技术研究[J].城市轨道交通研究,2016,19(9):115-119Geng Cheng. Study on isolation protection technology of subway tunnel through buildings at short distance[J]. Urban Mass Transit,2016,19(9):115-119
8 罗富荣,曹伍富,韩煊,等.北京地铁7号线土建施工技术及应用[M].北京:中国铁道出版社,2018Luo Furong,Cao Wufu,Han Xuan,et al. Civil construction technology and application of Beijing metro line 7[M]. Beijing:China Railway Publishing House,2018
9 罗富荣.北京地铁工程建设安全风险控制体系及监控系统研究[D].北京:北京交通大学,2011Luo Furong. Study on safety risk control system and monitoring system of Beijing metro construction[D]. Beijing:Beijing Jiaotong University,2011
10 于清浩.大跨浅埋公路隧道下穿既有建筑施工的沉降控制[J].现代隧道技术,2010,47(2):82-86Yu Qinghao. Settlement control for existing construction of largespan shallow buried highway tunnel[J]. Modern Tunneling Technology,2010,47(2):82-86
11 许军,彭军.浅埋大跨度地铁隧道下穿高层建筑施工控制研究[J].城市轨道交通研究,2016,19(3):99-103Xu Jun,Peng Jun. Study on construction control of shallow buried long-span subway tunnel through high-rise building[J]. Urban Mass Transit,2016,19(3):99-103
12 李延春,李术才,陈卫忠,等.厦门海底隧道的流固耦合分析[J].岩土工程学报,2004,26(3):397-401Li Yanchun,Li Shucai,Chen Weizhong,et al. Fluid-solid coupling analysis of xiamen undersea tunnel[J]. Journal of Geotechnical Engineering,2004,26(3):397-401
13 中华人民共和国.建筑地基基础设计规范:GB 50007—2011[S].北京:中国建筑工业出版社,2011The People's Republic of China. Code for design of building foundation:GB 50007—2011[S]. Beijing:China Building Industry Press,2011
14 曲强,于鹤然.盾构隧道下穿城铁地面线施工风险分析及对策研究[J].铁道标准设计,2013(6):88-91Qu Qiang,Yu Heran. Risk analysis and countermeasure study on construction of shield tunnel under metro ground line[J]. Railway Standard Design,2013(6):88-91