Analysis on shield construction parameters during down crossing existing buildings
ZHANG Run feng1, LIANG Rong zhu2,3, ZHANG Xian min1, XUE Xin hua4
1. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; 2. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;3. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 4. College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China
The law of shield construction parameters and attitude control are presented and interpreted by investigating the Hangzhou metro Line 2 tunnel project. The monitored construction data and field measurements show that the heave of buildings occurs when the earth pressures of chamber are larger than the horizontal earth pressures in situ and the cutter head is in front of the buildings. There are certain relationships between the rotating direction and the earth pressures of chamber. When the cutter head rotates clockwise, the monitored left earth pressures are significantly larger than the right earth pressures, and vice versa. Shield went doun for several times beneath shield driving in order to reduce the compressing effect caused by cutter head and avoide the larger heave of the buildings. The opposite rotating direction of cutter head helps to adjust the rolling of shield body. Set that the thrusts of down zone jacks is larger than that of upper zone jacks, the correction moments caused by the difference will effectively adjust the pitching angels during tunnlling in soft soils．
ZHANG Run feng, LIANG Rong zhu, ZHANG Xian min, XUE Xin hua. Analysis on shield construction parameters during down crossing existing buildings. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(3): 545-550.
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