To ensure the safety of the highspeed
culvert when a shield tunnel section of Guangzhou metro crossing underneath
pile foundations of a highspeed culvert in upper soft
and lower hard limestone strata, three reinforcement schemes are selected, and
the reinforcement scheme of oblique jet grouting pile + raft board + composite
foundation is adopted. The threedimensional finite
element is used to calculate and predict the settlement of the bridge pile
foundation, and the results are compared with monitoring data. The theoretical
calculation analysis and construction monitoring results show the following:
(1) The multiangle and omnibearing jet grouting can
effectively avoid existing pile foundations, and controlling the mud discharge
volume, ground pressure, and the foundation settlement induced by jet grouting
can effectively reduce the influence of reinforcing construction on culvert
foundation piles. The measured settlement of the culvert cap is 8.04 mm. (2)
During shield tunneling, the measured total settlement of the culvert cap is
10.87 mm, which is within safe and controllable range, resulting in normal
traffic of highspeed viaduct and culverts.
LI Jianping, TANG Kai
. Reinforcement Technology of Pile Foundation of HighSpeed
Culvert Undercrossed by Shield Tunnel in Limestone
Area[J]. Tunnel Construction, 2021
, 41(S2)
: 533
-541
.
DOI: 10.3973/j.issn.2096-4498.2021.S2.068
