To investigate
the deformation control strategy of a superlargediameter
shield laterally crossing existing pile foundation at a short distance, a case
study is conducted on the Jiluo road Yellow river tunnel in Jinan, China, a
refined numerical model is developed to simulate the shield tunneling process
based on onsite monitoring data and construction
parameters and the impact of adjacent embankment on the pile foundation
response during the process of the shield tunneling. Furthermore, the
application effects of reinforcement measures under various construction
parameters are comparatively analyzed and the adaptability of the comprehensive
reinforcement measures of isolation pile strengthening + highpressure jet grouting pile reinforcement + pregrouting reinforcement
using steel flower tube under various construction conditions is investigated.
The results show the following: (1) The adjacent embankment will raise the
slope of the pier platform after laterally crossing the early driven tunnel,
and this effect will occur at a certain time under specific construction
conditions. (2) On the premise that the construction parameters are well
controlled, adopting corresponding measures to strengthen the pile can better
restrict the influence of early soil disturbance on the pile foundation;
however, the final application effect of the reinforcement measures is limited.
(3) The variance of different reinforcement measures in controlling the
transverse horizontal displacement of pile foundation is more obvious than that
in the longitudinal direction. (4) The influence of slurry pressure on the
application of the reinforcement measures is considerable, while the effect of
grouting pressure is very limited in this respect.
YUAN Peng
,
WEI Lifeng
,
HE Xiaobin
. Deformation Control of Pile Foundation Laterally
Crossed by a SuperLargeDiameter
Shield near Yellow River Embankment: a Case Study of
Yellow Rivercrossing Tunnel on Jiluo Road in Jinan,
China[J]. Tunnel Construction, 2022
, 42(5)
: 907
-916
.
DOI: 10.3973/j.issn.2096-4498.2022.05.018
