Paper Title :Comparison Study on Loosening Loads of SEM-Pile
Author :Hyeong-Gyu Kim, Eun-Hyung Park, You-Kyung Lee
Article Citation :Hyeong-Gyu Kim ,Eun-Hyung Park ,You-Kyung Lee ,
(2017 ) " Comparison Study on Loosening Loads of SEM-Pile " ,
International Journal of Mechanical and Production Engineering (IJMPE) ,
pp. 5-11,
Volume-5,Issue-12
Abstract : With the increased development in downtown underground space facilities that vertically cross under a railway at
a shallow depth, the demand for non-open cut method is increasing. However, most construction sites still adopt the pipe
roof method, where medium and large diameter steel pipes are pressed in to form a roof, enabling excavation of the inside
space. The super equilibrium method (SEM) has been developed to minimize ground disturbance and loosening load, and
uses small diameter pipes of approximately 114 mm instead of conventional medium and large diameter pipes. This small
diameter steel pipe is called an SEM pile. After SEM piles are pressed in and the grouting reinforcement is constructed, a
crossing structure is pressed in by using a hydraulic jack without ground subsidence or heaving. The SEM pile, which plays
the role of timbering, is a fore-poling pile of approximately 5 m length that prevents ground collapse and supports surface
load during excavation of toe part. The loosening region should be adequately calculated to estimate the spacing and
construction length of the piles and stiffness of members. In this paper, we conducted a comparative analysis of calculations
of loosening load that occurs during the press-in of SEM pile to obtain an optimal design of SEM. We analyzed the influence
of factors in main theoretical and empirical formulas applied for calculating loosening regions, and carried out FEM analysis
to see an appropriate loosening load to the SEM pile.
Index terms - Elasto-plastic analysis, Non-open cut tennel, SEM method, SEM pile, Fore poling, Loosening load
Type : Research paper
Published : Volume-5,Issue-12
Copyright: © Institute of Research and Journals
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Published on 2018-01-31 |
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