To solve the challenges in
obtaining the target total thrust vector based on the shield posture adjustment
requirements during self-adaptive
shield axis control in soft soil strata, a shield thrust vector self-adaptive control technology is proposed in this study. Through the
closed-loop control combining the total thrust with the
shield tunneling speed, as well as the horizontal and vertical moments of the
total thrust with the target steering angles in the horizontal and vertical
directions, respectively, the fast self-adaptive
generation of the total thrust vector under non-constant
load is realized. Then, a large-scale testing platform
which can simulate shield tunneling along a straight line and a hydraulic
system allowing independent control of all propulsion cylinder units is
developed. The feasibility of steady-state driving of a
shield under non-constant load forces, non-constant load force moments, and non-constant
load force vectors is verified. The test results show that: the total thrust
effectively responded to changing load force, and the difference between them
was maintained to be the frictional resistance of the system, and recovery
after slowdown of the shield due to sudden changes of load force was observed;
the horizontal posture deviation of shield head could be overshoot and reset
after a small sudden change in the event that the total thrust moments of the
shield failed to follow up with the changes of the load force moments in time;
the total thrust vectors achieved high-quality collaborative
response to the load force vectors, with the tunneling speed and the horizontal
posture deviation of shield head controlled in the ranges of －1－+2 mm/min and ±3
mm from the set values, respectively.
CHEN Gang
,
ZHU Yeting
,
WANG Zhihua
,
WANG Xiuzhi
,
QIN Yuan
,
ZHANG Zixin
. Experimental Study on
Thrust Vector Self-Adaptive Control Technology for Shield Tunneling in Soft Soil Strata[J]. Tunnel Construction, 2024
, 44(11)
: 2159
-2170
.
DOI: 10.3973/j.issn.2096-4498.2024.11.006
