A case study on the 3rd bid section of the Shanghai
airport railway link line is presented to effectively shorten the construction
period by deploying only one shield in a longdistance
shield tunnel. On the premise of keeping the operation habits of shield drivers
unchanged, a synchronous technology combining shield tunneling and segment
assembling with closedloop active control on the
cylinder pressures of the shield propulsion system is developed, which can
maintain the stability of the total thrust force vector. Then, a redistribution
calculation method of the missing jacking force is proposed based on the
principle of uniform loading on a single segment. Finally, a largescale test platform with a similarity ratio of 1/2 is established to
verify the whole set of the synchronous technology. The test results show the
following: first, the error of the total thrust force is controlled within ±4%. Second, the horizontal and vertical deviations of shield posture
are controlled within ±12 mm. Third, the driving speed
of the shield ranges from -6 to +6 mm/min of the set value. Finally, the
compressive safety factor of the segment structure reaches 213.
ZHU Yeting
.
Model Test Verification of Synchronous Technology
Combining Shield Tunneling with Segment Assembling Based on Principle
of Uniform Loading on a Single Segment
[J]. Tunnel Construction, 2022
, 42(5)
: 854
-862
.
DOI: 10.3973/j.issn.2096-4498.2022.05.012
