To rationally select cutters for tunnel boring
machines(TBMs) in extremelyhard rocks to improve the TBM
construction efficiency and reduce cutter consumption, a case study is
conducted on the YE project in Xinjiang, China. Under the condition of intact
Class Ⅱ tuff with a uniaxial compressive strength of 100－150 MPa, the
excavation performance of narrow and conventional cutters is tested and
compared, and the feasibility and rationality of reducing the width of the disc
cutter ring to improve the degree of TBM penetration and excavation speed are
explored. The results reveal the following: (1) Narrow cutters can considerably
improve the penetration degree and construction speed, which becomes more
obvious when increasing the compressive strength of the surrounding rock. (2)
The consumption of narrow cutters is higher than that of conventional cutters,
while the proportion of failure forms of these two cutter types remains almost
the same, with minimal impact on the utilization rate of TBM operations. (3)
The narrow cutters exhibit a superior economic benefit over conventional
cutters.
ZHENG Jiaxing
,
JIA Haolin
,
PEI Chengyuan
,
DU Lijie
,
LI Qingwei
,
SONG Wenxue
,
TANG Rong
. Comparative Testing and Analysis of Onsite Performance
of Narrow and Conventional Disc Cutters in Tunnel Boring Machines[J]. Tunnel Construction, 2024
, 44(2)
: 360
-367
.
DOI: 10.3973/j.issn.2096-4498.2024.02.015
