ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2016, Vol. 36 ›› Issue (12): 1412-1420.DOI: 10.3973/j.issn.1672-741X.2016.12.002
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WANG Zhijie1, XU Ruining1, 2, *, HE Nengfang3
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Abstract:
The deformation characteristics of large crosssection Tongzilin Tunnel on MiyiPanzhihua Section on ChengduKunming Railway located in Xigeda Fm strata and constructed by three bench+temporary invert arch method are studied by numerical simulation and site monitoring, so as to guarantee the stability of surrounding rocks during construction. The study results show that: 1) The deformations of surrounding rocks of large crosssection tunnel in Xigeda Fm strata are mainly along vertical direction. 2) The primary crown top settlement and crown top settlement induced by top heading excavation takes 41.3% in total settlement; and the advanced influencing range is 1.3D. 3) The crown top settlement and arch feet convergence are mainly affected by middle bench excavation. 4) The prediction formula for crown top settlement vs. time is U=102.105·exp(-5.33/X). 5) The prediction formula for horizontal convergence of arch feet vs. time is L1=19.552·exp(-7.49/X). 6) The prediction formula for horizontal convergence of tunnel wall waist vs. time is L2=17.862·exp(-23.26/X).
Key words: Xigeda Fm strata, large crosssection tunnel, deformation characteristic, numerical simulation, field experiment
CLC Number:
U 455
WANG Zhijie, XU Ruining, HE Nengfang. Study of Deformation Characteristics of Large Crosssection Tunnel in Xigeda Fm Strata[J]. Tunnel Construction, 2016, 36(12): 1412-1420.
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