In this study, a case study is conducted on the
Muzhailing highway tunnel to explore the feasibility and applicable effects of
the cantilever roadheader construction method in squeezing rock tunnels based
on engineering geological conditions. The types of cantilever roadheader are
selected according to the project implementation conditions, and a twobench
excavation scheme for the cantilever roadheader is designed and developed.
Furthermore, a comparative analysis is conducted on twobench excavation by a cantilever roadheader and threebench excavation for drilling and blasting in a test section in
terms of construction efficiency and effect. The main findings are summarized
as follows: (1) The selection of the cantilever roadheader should focus on the
cutting area and power according to rock strength, excavation crosssection, and work efficiency; (2) The surrounding rocks of the
Muzhailing highway tunnel can be divided into two categories and six types
based on the applicability of cantilever roadheader; (3) Compared with the
construction efficiency of the threebench drilling and
blasting method, the twobench cantilever roadheader
construction method can increase construction advance by 20% and reduce average
overexcavation, labor consumption, and shotcrete
overconsumption by 150 mm, 5－10 persons, and 57%,
respectively; (4) Compared with the threebench
drilling and blasting method, the surrounding rock pressure is reduced by 0.01－0.11 MPa using the twobench cantilever
roadheader construction method with a stable and evenlydistributed final surrounding rock displacement and arch frame
stress. Moreover, the average stress of the anchor cable is increased by 39 kN.
TANG Shaowu
,
GUO Xinxin
,
YU Jiawu
,
LONG Wenhua
. Adaptability of Cantilever Roadheader Construction
Method in Squeezing Rock Tunnels: A Case Study of
Muzhailing Highway Tunnel[J]. Tunnel Construction, 2024
, 44(1)
: 163
-171
.
DOI: 10.3973/j.issn.2096-4498.2024.01.015
