为探讨隧道仰拱及仰拱填充整体浇筑的可能性，解决仰拱与仰拱填充分开浇筑与整体浇筑的争论，采用数值计算手段，建立荷载-结构模型，针对填充体不设置中心沟（管）、设置中心管、设置中心沟3种情况，分析仰拱填充不同浇筑时机对衬砌结构受力性能影响差异。研究结果表明： 1）当仰拱填充内不设置中心管（沟），仰拱填充与仰拱整体施作，基本不影响衬砌结构受力性能； 2）当仰拱填充内设置中心管，仰拱填充与仰拱整体浇筑，对衬砌结构受力性能影响较小，但填充表面中心处拉应力较大，为分开浇筑工况的7倍以上，加之中心管上部填充体厚度较薄，对抗拉不利，易开裂破坏，仰拱不宜与填充整体施作； 3）当仰拱填充设置中心沟，仰拱填充与仰拱整体浇筑，对衬砌结构整体受力较为不利，不宜整体施作。
In order to discuss the possibility of integral
pouring of the inverted arch and its filling, and solve the dispute between
separate pouring and integral pouring of the inverted arch and its filling.
Loadstructure model is established by numerical calculation to analyze
different effects of inverted arch filled at different pouring time on stress
performance of lining structure under three situations for filling body, i.e.
without central drain (pipe), with central pipe and with central drain. The
main conclusions are as follows. (1) When the filling of inverted arch is
without central pipe (ditch),the integral pouring of inverted arch and its
filling has no effect on the stress performance of lining structure.(2) When
the filling of inverted arch is with central pipe, the integral pouring of
inverted arch and its filling have less effect on the stress performance of
lining structure; whereas the stress is greater at the center of filling surface,
exceeding seven times greater as which in working condition of separate
pouring. Moreover, the thickness of filling body at upper part of central pipe
is small, which is unfavorable to tensile strength and prone to crack and
damage, thus inverted arch and its filling should not be poured integrally. (3)
When the filling of inverted arch is provided with central drain, the integral
pouring of inverted arch and its filling is adverse to the overall stress of
lining structure, which is not recommended.
