The Tel Aviv Green Line
Light Rail Project is the second underground light rail line in Israel, facing
challenges due to limited experience in tunneling with shield on smallradius curves within calcareous cemented strata (Kurkar). To address
this issue, the authors propose a targeted design for the shield and conduct an
adaptability study. The geological conditions in Israel and the specifics of
the Green Line route are analyzed, identifying key technical challenges related
to main drive torque, formation wear, surface settlement control, and smallradius curves. In response to these challenges, design solutions are
proposed for cutterhead layout, power configuration, screw conveyor, muck
conditioning, thrust system, and machine dimensions. Furthermore, the
applicability of the shield is analyzed from the perspectives of tunneling
parameters, cutter wear, and ground disturbance. The results indicate the
following: (1) Central twin cutters should be avoided. (2) Shortening the
shield length, setting active articulation cylinders, and using profiling
cutters for 20 mm over-excavation successfully solve
the R178.3 m small-radius curve issue. (3) Muck
conditioning with foam and water achieves good plasticity, with a slump of
approximately 160 mm. (4) The earth pressure in the soil chamber can be
slightly lower than the theoretical active earth pressure value.
LIU Xiaomin
,
SONG Ziwen
,
WANG Shiyou
,
CHEN Hongke
,
JIN Chunshang
,
SONG Liwei
. Selection and Adaptability
of Shields in Calcareous Cemented Strata in Israel: A Case Study of Tel Aviv Green Line Light Rail Project[J]. Tunnel Construction, 2024
, 44(S2)
: 452
-461
.
DOI: 10.3973/j.issn.2096-4498.2024.S2.046
