When a tunnel boring machine(TBM) tunnels through
fault fracture zones in the Tianshan Shengli tunnel on the UrumqiYuli
expressway, severe loosening and falling of surrounding rocks occur. Therefore,
numerical simulation methods are employed to examine the deformation and
plastic zones of the surrounding rock using traditional and steeltube support methods, investigating the support effect of steel
tubes. Additionally, a field investigation is conducted to comparatively
analyze the construction efficiency and economy of various support methods,
illustrating the applicable conditions for each. The results reveal the
following: (1) In the fault and fracture zones, the deformation and plastic
zone of the surrounding rock increase after the TBM shield passes through,
aggravating the damage of surrounding rock. The traditional support method with
bolts and steel arches cannot effectively control the deformation of
surrounding rock and plastic zone development. (2) The cumulative settlement of
surrounding rock supported by steel tubes is 53% lower than that with
traditional support methods in fault and fracture zones, with faster
convergence of the surrounding rock deformation, showing a good control effect
on deformation and plastic zone development of surrounding rock. (3) The
plastic zone of the surrounding rock supported by steel tubes is smaller than
that of traditional support methods, with a 44% reduction in sidewall, showing
that the steel tube support method benefits the surrounding rock stability. (4)
In general strata, the traditional support method is more economical and
efficient, while in fault and fracture zones, steel tube support provides a
safer working space and reduces the consumption of steel arches and shotcrete
anchor support, demonstrating better economy and construction efficiency
compared with traditional support methods.
LI Linfeng
,
TAN Zhongsheng
,
ZHOU Zhenliang
,
PENG Wenbo
.
Support Effect of Steel Tubes of Open Tunnel Boring
Machine in Tianshan Shengli Tunnel
[J]. Tunnel Construction, 2024
, 44(5)
: 984
-990
.
DOI: 10.3973/j.issn.2096-4498.2024.05.007
