Open AccessOptimization of Jacking Sequence of Shallow-buried Pipes in Saturated Soft Soil
Author(s) -
Likang Chen,
Hehua Zhu,
Panpan Cheng,
Long Zhou
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/741/1/012037
Subject(s) - jacking , roof , geotechnical engineering , stratum , deformation (meteorology) , displacement (psychology) , structural engineering , disturbance (geology) , engineering , sequence (biology) , computer simulation , geology , art , psychology , paleontology , oceanography , performance art , biology , psychotherapist , genetics , art history , simulation
In order to extend the method of undercutting to the construction of metro stations in soft soil, Shanghai takes a section of Guiqiao Road Station on Shanghai Metro Line 14 as trial engineering, and applies the pipe-roof method novelly to this engineering. Based on this project, the numerical simulation was used to optimize the construction sequence of pipe groups, with the purpose of reducing the disturbance to the soil stratum from pipe jacking. First of all, the stress release ratio, one of the most important parameters in the numerical model, was calibrated according to the on-site measured ground surface displacement, so that the established numerical model was validated. On this basis, a series of modellings with different jacking sequence were carried out and their disturbance degrees to the surrounding soil were comparatively analyzed. It shows that the construction sequence of the horizontal pipe groups is the decisive factor of the construction disturbance degree, and giving priority to lower pipes will reduce the ground deformation; and the less the number of steel pipes in the jacking construction, the smaller the deformation will be. Furthermore, the construction scheme of pipe groups was optimized, leading to reductions in the total and maximum surface deformation by 12% and 11.5% respectively. This study is of great significance for the further realization of micro-disturbance construction control when adopting pipe-roof method.