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Underground excavation techniques are frequently used in subway stations during the construction of urban rail transit. The current study analyzes and investigates the surface settlement and deformation laws of large-span shallow buried underground excavated stations depending on a vast quantity of measured data from the Qingdao Metro Line 3. Accor...
Citations
... Controlling the critical construction steps of the CRD method plays a critical role in ensuring efficient construction and safety (Wang et al., 2020). Based on the analysis and study of the ground settlement deformation laws of large-span shallowburied concealed stations, the excavation of guide holes on both sides will cause longitudinal ground settlement (Yan et al., 2022). The problem of pavement settlement caused by underground works is not limited to tunnel works, for example, coal mining causes large subsidence above the mining area (Shang et al., 2022). ...
Several engineering practices have shown that the excavation of shallow-buried tunnels beneath major roads, as well as the selection of appropriate engineering measures and construction methods, has a significant impact on road surface settlement. Therefore, field monitoring and numerical simulation are adopted in this study to analyze the effect of the cross diaphragm (CRD) excavation method on surface settlement for the under-construction Yüan 1 railroad tunnel. The findings show that during the excavation of the four divisions of the CRD excavation method for shallow-buried tunnels, the amount of surface settlement caused by the excavation of part 1 accounts for 40% of the total surface settlement, followed by the excavation of part 3, accounting for 30% of the total surface settlement, and the difference between the excavation of parts 2 and 4 is insignificant, with part 2 slightly larger than part 4. The main influence of the CRD method on surface settlement for shallow-buried tunnels is 0.64–0.86 times the cavity diameter from the tunnel median, within which the final surface settlement caused by excavation is within the same horizontal range, and beyond which the surface settlement is prone to dramatically decline. By applying advanced grouting and adjusting the construction method of CRD based on the monitoring data, the effect of the CRD excavation method on surface settlement can be controlled.
... Particle Swarm Optimization Algorithm. After more than ten years of research, the particle swarm optimization algorithm has made some great progress in both engineering applications and computational performance optimization research [3]. The functional changes are mainly reflected in dealing with constraints and optimization problems; for example, Liu et al. used particle swarm optimization to deal with optimization computation problems based on constraints of equations with parameter equations; for example, Cao et al. used particle swarm optimization to deal with geometric constraint problems; for example, Wang et al. used particle swarm optimization to solve discrete optimization solutions of geometric constraint problems; Lu and Sun et al. tried to use particle, and Zhao et al. have also experimented with particle swarm optimization to solve the stochastic loader problem of spacecraft; and Lu and Sun et al. have tried to use particle swarm optimization to study and solve the optimal attitude control problem of manned spacecraft during solar panel extension. ...
To reduce urban pressure, urban rail transit has become an effective way to reduce traffic congestion, mitigate traffic accidents, reduce environmental pollution, and improve commuting efficiency. Subway as the main means of urban public transport travel, in recent years by people’s favor, although the construction industry of rail transit is developing rapidly and the industry scale is expanding, but because the construction of rail transit construction projects is very difficult, especially in the wet loess within the concealed excavation tunnel, but also frequent accidents, and the quality of the project is not easy to guarantee, so the underground railroad wet loess within the concealed excavation tunnel construction technology is poor. Therefore, it is especially important to study the construction technology and project quality management of underground railway concealed tunnel in wet loess. In this paper, based on the in-depth study of the basic principle of quantum particle swarm optimization calculation and the realization of key engineering technologies, the particle swarm optimization algorithm is programed using MATLAB software, and the coding scheme, operation specification, and operation parameters are designed. Then, combined with the particle swarm optimization algorithm and assisted MATLAB software, the main analysis of the construction and quality control of wet loess in concealed tunnels of subway projects was carried out, mainly by systematizing the relationship between the three major elements of subway project schedule, cost, and management and the construction and quality control of wet loess in concealed tunnels of a subway, and concluded that the construction and quality control of wet loess in concealed tunnels of the subway needed schedule. It is concluded that the construction and quality control of subway wet loess tunnel requires stable schedule, adequate cost budget, and management personnel.
