›› 2018, Vol. 39 ›› Issue (S1): 362-368.doi: 10.16285/j.rsm.2018.0548

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Comparison test of compression and uplift on pressure-static and grouting micropiles

ZONG Zhong-ling1, 2, LU Xian-long3, LI Qin-song1   

  1. 1. College of Civil Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu 222005, China; 2. Marine Resources Development Institute of Jiangsu (Lianyungang), Lianyungang, Jiangsu 222005, China; 3. China Electric Power Research Institute, Beijing 102401, China
  • Received:2018-04-03 Online:2018-07-20 Published:2018-09-02
  • Supported by:

    This woke was supported by Six Talent Peaks Project in Jiangsu Province(2016-JZ-066) and Science Foundation of Huaihai Institute of Technology (Z2015008).

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Abstract: Based on the ultimate bearing capacity tests at field site, comparison and analysis between compression and uplift is conducted for pressure-static and post-grouting micropile. A study is carried out in virtue of the Q-s curves to investigate the influence of pressure-grouting process and grouting volume ratios on the bearing capacity and ultimate pile side friction. The pile-soil interaction mechanism and uplift ultimate state is discussed; and then the uplift factor λ and the ultimate uplift displacement are suggested. The results show that compared with micro steel-pipe piles, the ultimate bearing capacity of pressure-static and post-grouting micropiles have been enhanced in soft foundation, especially for the uplift bearing capacity.

Key words: micropiles, pressure-grouting, ultimate bearing capacity, soft foundation, construction technology

CLC Number: 

  • TU 473

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