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Numerical Simulation Study on Whole Construction Process of Vertical Pipe Jacking
(1 Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015; 2 College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058)
Abstract In order to analyze the impact of vertical pipe jacking on the surrounding environment during the pro? cess of upward jacking from the utility tunnel, this paper uses the Midas GTS NX software to establish the model and simulate the vertical pipe jacking construction process by changing the material parameters of the model as well as activating and passivating the corresponding mesh. And then the effects on pipe jacking induced by different soil conditions, construction parameters, pipe diameters and groundwater depths are studied and compared with the model test data. The results show that the surface soils first settle and then heave in the range of -1D~1D (D is the diameter of vertical jacking pipe) along with the vertical pipe jacking, and the maximum heaving value is 4.13 mm; the utility tunnel settlement increases gradually and is up to 3.44 mm at most; the worse the soil condition, the greater the disturbance to the soils and utility tunnel due to the upward jacking, and the existence of groundwater makes the surface heaving phenomenon disappear in the range of -1D~1D; different construction parameters have different effects on pipe jacking, the change of front thrust and pipe diameter has a little effect on pipe jacking, while the change of friction coefficient has a great effect on vertical displacements of soils and utility tunnel; the variation law of surface soil displacement measured by the model test is consistent with the numerical simulation results.
Abstract：
In order to analyze the impact of vertical pipe jacking on the surrounding environment during the pro? cess of upward jacking from the utility tunnel, this paper uses the Midas GTS NX software to establish the model and simulate the vertical pipe jacking construction process by changing the material parameters of the model as well as activating and passivating the corresponding mesh. And then the effects on pipe jacking induced by different soil conditions, construction parameters, pipe diameters and groundwater depths are studied and compared with the model test data. The results show that the surface soils first settle and then heave in the range of -1D~1D (D is the diameter of vertical jacking pipe) along with the vertical pipe jacking, and the maximum heaving value is 4.13 mm; the utility tunnel settlement increases gradually and is up to 3.44 mm at most; the worse the soil condition, the greater the disturbance to the soils and utility tunnel due to the upward jacking, and the existence of groundwater makes the surface heaving phenomenon disappear in the range of -1D~1D; different construction parameters have different effects on pipe jacking, the change of front thrust and pipe diameter has a little effect on pipe jacking, while the change of friction coefficient has a great effect on vertical displacements of soils and utility tunnel; the variation law of surface soil displacement measured by the model test is consistent with the numerical simulation results.
WEI Gang1 HAO Wei2 WEI Xinjiang1 WANG Xiao2 ZHANG Shuyuan2
.Numerical Simulation Study on Whole Construction Process of Vertical Pipe Jacking[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(6): 59-67
2021, Vol. 58 