Abstract
Anzhen Bridge Station of Beijing metro line 12, which adopts a separated‐island platform constructed by the undermining method, passes along the retaining wall of the North Third Ring Road. A numerical simulation method is adopted to study the deformation laws of the retaining wall under the influence of station construction. The simulation data show that the affected retaining wall will have large settlement and tilt, and countermeasures must be taken. Four countermeasures are formulated, and their control effects are analyzed. The calculation results show that the combination of anchor cables and waist beams can effectively control the tilt of the retaining wall, but the control effect on the absolute settlement is not obvious. The control effect of isolation piles is better than that of foundation grouting. The joint control method of anchor cables combined with waist beams, isolation piles, and deep hole grouting makes the deformation meet the target, and according to this measure, a concept of joint control aiming at the influence of the “source,” “propagation,” and “object” is proposed, which can provide a reference for similar projects with a great difficulty in deformation control.
Highlights
In concentrated areas, subway lines are usually laid along a city’s main road, so the subway tunnel or station underpasses the road frequently
There have been many studies on the stability of retaining walls, including the stability of retaining walls under static loads [4,5,6], the dynamic response of retaining walls [7,8,9,10,11], the behavior of retaining walls affected by deep excavation [12, 13], and the time-dependent behavior of piles and retaining walls as a result of excavationinduced soil movement [14]. ese studies have made many achievements in terms of the stability of retaining walls
According to the in-situ settlement laws of the retaining wall embankment, Ma et al [15] summarized the experiences on real-time adjustment of shield construction parameters and comprehensive use of grouting
Summary
Subway lines are usually laid along a city’s main road, so the subway tunnel or station underpasses the road frequently. According to previous research on the influence of underground construction on soil movement, station construction has the following main effects on retaining walls. Because the station adopts a separatedisland platform constructed by the undermining method, the construction of the main part of the station and the two connecting aisles will have a superimposed impact on the retaining wall, threatening the stability and safety of the retaining wall. Based on this background, this paper analyzed the deformation laws of retaining walls under the influence of station construction and proposed effective control measures and control concepts
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