Research purposes: Rectangular pipe jacking method has been widely used in engineering in recent years because of its advantages of high effective space utilization and shallow soil cover. Based on the example of Yaoyuan Road Station No. 1 and No. 2 rectangular pipe-jacking crossing entrance project, this paper analyzes the ground surface settlement and deformation law caused by pipe-jacking construction in Hefei-old clay stratum by using random medium theory, Plaxis finite element analysis and engineering site monitoring methods, and provides reference for similar projects.
Research conclusions: (1) Pipe jacking in the Hefei-old clay stratum mainly caused the settlement of the upper stratum, which was mainly caused by the building gap between the pipe joint and the soil. (2) With the driving of pipe jacking, the surface settlement presents the characteristics of a slow increase at first, then a sharp increase, and finally tends to be flat. The main influence range of pipe jacking construction is divided by the excavation face, and the influence range of the front is about 3z0, and the influence range of the rear is about z0. (3) The transverse surface settlement is basically symmetrical with the center line of the pipe jacking as the axis, and the influence range is about 2z0 on both sides of the center line. (4)The research results can provide a basis for the design and construction of rectangular pipe jacking in old clay strata.
Key words
rectangular pipe jacking /
surface subsidence /
random medium theory /
Hefei old clay stratum
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] 洪开荣.近2年我国隧道及地下工程发展与思考(2017—2018年)[J].隧道建设(中英文),2019(5):710-723.
Hong Kairong. Development and Thinking of Tunnels and Underground Engineering in China in Recent 2 Years (From2017 to 2018)[J]. Tunnel Construction , 2019(5):710-723.
[2] PECK R B.Deep Excavations and Tunnelling in Soft Ground[C]//Proceedings of the 7th International Conference on SMFE. Mexico City,1969:225-290.
[3] 阳军生,刘宝琛.挤压式盾构隧道施工引起的地表移动及变形[J].岩土力学,1998(3):10-13.
Yang Junsheng, Liu Baochen.Ground Surface Movement and Deformation Due to Tunnel Construction by Squeezing Shield[J]. Rock and Soil Mechanics, 1998(3): 10-13.
[4] 韩煊,李宁.隧道施工引起地层位移预测模型的对比分析[J].岩石力学与工程学报,2007(3): 594-600.
Han Xuan, Li Ning.Comparative Analysis of Strata Prediction Models for Ground Movement Induced by Tunnel Construction[J].Chinese Journal of Rock Mechanics and Engineering, 2007(3): 594-600.
[5] 邓长茂,彭基敏,沈国红.软土地区矩形顶管施工地表变形控制措施探讨[J].地下空间与工程学报,2016(4):1002-1007.
Deng Changmao, Peng Jimin, Shen Guohong.Control Methods of Ground Surface Settlement Caused by Rectangular Pipe Jacking Construction in Soft Soils[J].Chinese Journal of Underground Space and Engineering, 2016(4):1002-1007.
[6] 林强强. 矩形顶管引起地面变形的实测分析与控制研究[D].上海:同济大学,2008.
Lin Qiangqiang.Experimental Analysis and Control of Ground Deformation Caused by Rectangular Pipe Jacking [D].Shanghai: Tongji University,2008.
[7] 王晓睿,周峰,张振,等.超大断面矩形顶管隧道施工动态变形规律[J].地球科学,2016(11):1959-1965.
Wang Xiaorui, Zhou Feng, Zhang Zhen,etc. Dynamic Deformation of the Oversized Cross-Section Rectangular Pipe-Jacking Tunnel[J]. Earth Science, 2016(11):1959-1965.
[8] 李铮华. 矩形顶管施工对邻近建筑物的影响分析[D].广州: 广州大学,2014.
Li Zhenghua.Analysis of Influence of Rectangular Pipe Jacking Construction on Adjacent Buildings [D]. Guangzhou: Guangzhou University, 2014.
[9] 许有俊,史明,李育发,等.大断面土压平衡矩形顶管施工引起地表竖向变形研究[J].武汉大学学报:工学版,2020(7):597-604.
Xu Youjun, Shi Ming, Li Yufa,etc. Study on Vertical Deformation of Ground Surface Caused by Construction of Large Section Soil Pressure Balanced Rectangular Pipe Jacking[J]. Engineering Journal of Wuhan University,2020(7): 597-604.
{{custom_fnGroup.title_en}}
Footnotes
{{custom_fn.content}}
PDF(1167 KB)
