›› 2012, Vol. 33 ›› Issue (11): 3509-3515.

• Testing Technology • Previous Articles     Next Articles

Sensor protection techniques of super-large deep-water pile group foundation

CHEN Zhi-jian1，CHEN Xin-di2，TANG Yong3，ZHANG Ning-ning4   

  1. 1. College of Earth Science and Engineering, Hohai University, Nanjing 210098, China; 2. College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China; 3. Fujian Academy of Building Research, Fuzhou 350025, China; 4. China Huadian Electric Power Research Institute, Hangzhou 310030, China
  • Received:2011-08-24 Online:2012-11-12 Published:2012-11-14

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Abstract: The pile group foundation of Sutong bridge is the largest in the world. It is composed of 131 overlength cast-in place bored piles which are 117 m long. The sensors worked under this engineering environment must subject to large pressure, as well as construction factors, and they damage easily. In order to improve the installing survival rate of the sensors, some sensor protection techniques are put forward after several field tests, including concrete strain gauge, surface strain gauge, hydrostatic level and water pressure gauge. The installing survival rate of sensors can be ensured by implementation of sensor protection techniques. The average survival rate exceeds 96%. The rules of load mechanism and uneven settlement are analyzed by monitoring data. The results show that the load mechanism of overlength cast-in place bored piles is different with the piles in common. The uneven settlement of large-scale pile group foundation appears in the direction across bridge; and the uneven settlement in longitudinal direction can be ignored.

Key words: pile group foundation, sensor protection technique, survival rate, load bearing properties

CLC Number: 

  • U 44
[1] FENG Jun, ZHANG Jun-yun, ZHU Ming, JIANG Nan,. Characteristic study of horizontal bearing capacity and pile group effect coefficient of laterally loaded high pile group foundation for bridge in soft soil [J]. , 2016, 37(S2): 94-104.
[2] GAO Zi-kun , SHI Jian-yong . Research of constitutive relation of granular material and stability of pile group foundation [J]. , 2013, 34(8): 2174-2180.
[3] ZHANG Ning-ning , CHEN Zhi-jian , CHEN Yuan-jun , BIAN Lei . PSI and CRI joint algorithm used to monitor settlements of Sutong bridge foundation [J]. , 2012, 33(7): 2167-2173.
[4] WANG Jun-jie , ZHU Jun-gao , WU Shou-chang . Numerical simulation on behavior of large-scale overlength pile group foundation [J]. , 2008, 29(3): 701-706.
[5] LIU Han-long, WANG Zhi-hua, CHEN Guo-xing. Stochastic seismic response and reliability analysis of large pile group foundation for bridge on deep overburden layers [J]. , 2007, 28(2): 263-268.
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