To study the change in the segment load of largediameter
pipe jacking under deepburied and high water pressure
conditions, a case study is conducted on the pipejacking
project of a power tunnel in Foshan, China. Further, the segment load and pore
water pressure of the segment during pipejacking
construction are measured and analyzed, and the results are compared with the
theoretical calculation results in the current specifications. Then, the
calculation method of segment load under grouting condition is deduced. The
monitoring data and calculation results show the following. (1) The joint load
of the segment is evenly distributed around the pipe wall, the top load is less
affected by the grouting pressure, the bottom load accords with the grouting
pressure, and the change of the bottom load is greater than that of the
grouting pressure. (2) The state of pipesoil contact
accords with the tunnel stability assumption during grouting jacking, and it
fully accords with the pipesoil interaction assumption
when grouting stops at the end of jacking. (3) Under the grouting condition,
the segment load calculated by each specification is smaller than the measured
values, and the pipe load calculation model by Terzaghi passive soil arch model
is more reasonable.
NIU Guolun
,
MA Baosong
,
ZHANG Peng
,
CHEN Xiaolong
,
WANG Jing
. Measurement Analysis of PipeSoil
Interaction in LargeDiameter
Pipe Jacking Project of a Power Tunnel in Foshan, China[J]. Tunnel Construction, 2021
, 41(8)
: 1353
.
DOI: 10.3973/j.issn.2096-4498.2021.08.011
