Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (4): 1339-1346.doi: 10.16285/j.rsm.2019.0583

• Geotechnical Engineering • Previous Articles     Next Articles

Stability calculation of micro steel tube mortar composite pile in soil

ZHU Yan-peng1, 2, YAN Zi-hao1, 2, ZHU Yi-fan3   

  1. 1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 3. College Park, University of Maryland, College Park, MD, 20740, USA
  • Received:2019-03-27 Revised:2019-06-07 Online:2020-04-11 Published:2020-07-01
  • Supported by:
    This work was supported by the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (IRT_17R51) and the Major Project of Science and Technology Plan Projects of Gansu Province (1302FKDA030).

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Abstract: The micro steel tube mortar composite pile is widely used in foundation reinforcement and pile replacement because of its clear force mechanism, simple construction, short construction period and low cost. However, there is rare theoretical study on instability or failure of micro steel tube mortar composite piles with small diameter and large length in soil. Therefore, on the basement of the theory of elastic foundation beam, the differential equation is solved according to the force relationship between the pile and the foundation soil. The specific expression of the bearing capacity for instability of the micro steel tube mortar composite pile is given. By comparing with the actual engineering in situ test, it is found that the theoretical and experimental results are close. An expression calcuating the minimum critical length is given to guide the construction of the project. Through a program writen in Matlab, the instability load refering to different pile lengths is calculated and analyzed under different stiffness ratios between soil and pile, which reflects the influence degree of soil on the instability and restraint force of micro steel tube mortar composite piles.

Key words: stability, analytical solution, k method, micro steel pipe mortar composite pile

CLC Number: 

  • TU 473
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