The secondary lining formwork of the composite lining
in superlarge underground engineering in hard rock has several
disadvantages, such as difficulty in concreting, complicated formwork
engineering, and excess concrete masonry work. Accordingly, a case study is
conducted on an underground oil storage depot, and the finite difference
calculation software and onsite insitu test are employed to analyze the mechanical mechanism and
optimize the support system for largescale underground
engineering. The results reveal the following: (1) When excavating a large
underground cavern in the rock mass with good surrounding rock conditions, a
singlelayer shotcrete lining can improve construction
efficiency and reduce the amount of concrete under the premise of reasonable
support parameters and guaranteed construction quality. (2) Compared with the 〖WT５《TNR#I》〗Q〖WT５《TNR》〗SYSTEM
rock support table, the optimized support system of polypropylene fiber
shotcrete support and prestressed bolt can better control the deformation of
surrounding rock and reduce the tensile stress area of the support structure,
achieving a support effect close to that of the composite lining. (3) After the
field test, the deformation and stress of the optimized support system are
acceptable, and the maximum deformation of the dome is approximately 8 mm,
indicating a safe and reliable support structure.
MA Kaimeng
,
ZHANG Junru
,
LIU Yumeng
,
DAI Yi
,
WANG Shengtao
. Support System Optimization of SuperLarge
Cavern with Hyperboloid Dome[J]. Tunnel Construction, 2022
, 42(7)
: 1257
-1266
.
DOI: 10.3973/j.issn.2096-4498.2022.07.014
