ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2017, Vol. 37 ›› Issue (10): 1287-1295.DOI: 10.3973/j.issn.1672-741X.2017.10.012
Previous Articles Next Articles
KANG Zhijun1, 2, TAN Yong2, *, LI Jinlong2
Received:
Revised:
Online:
Published:
Abstract:
A 3D numerical model is established by FLAC3D based on fluidsolid coupling effect, so as to simulate and verify the process of instability of tunneling face; moreover, the influences of water level and seepage time on tunneling face deformation, ground settlement and pore pressure are discussed. The study results show that: 1) The developing process of tunneling face deformation can be divided into 3 stages relating with expansion of soil plastic zone. 2) Compared to the case without hydraulic pressure, the stability of tunneling face accounting for fluidsolid coupling effect is significantly reduced; with the increase of water level and seepage time, the limiting supporting pressure to maintain stability increases gradually. 3) The support pressure is characterized by support pressure ratio; the reduction of the supporting pressure would induce the decrease of pore pressure at the front of tunneling face; the pore pressure near tunneling face is affected much more, which features funnelshaped influence zone. 4) When collapse occurs to tunneling face, the significant settlements and soil displacement field of the ground would extend to ground level; and the horizontal displacement at the center of tunneling face correlates with the maximum ground settlement, showing parabolic correlation and linear correlation at different stages.
Key words: shield tunnel, stability of tunneling face, fluidsolid coupling, supporting pressure, ground deformation, pore pressure
CLC Number:
U 435
KANG Zhijun, TAN Yong, LI Jinlong. Numerical Study of Working Face Stability of Shield Tunnel Based on FluidSolid Coupling Effect[J]. Tunnel Construction, 2017, 37(10): 1287-1295.
0 / / Recommend
Add to citation manager EndNote|Ris|BibTeX
URL: http://www.suidaojs.com/EN/10.3973/j.issn.1672-741X.2017.10.012
http://www.suidaojs.com/EN/Y2017/V37/I10/1287
Fullscale Experimental Study on Bending Performance of Segmental Joints of Large Crosssection Shield Tunnel under Pure Compressive Bending Condition