Abstract
Abstract. More than 10 high-speed railway routes with top speeds of 300 km h−1 are expected to be operational from Beijing by the year 2020. However, the safety of these routes is affected by the occurrence of land subsidence. This paper focuses on the Beijing–Tianjin Intercity High-Speed Railway (BTR), the first high-speed railway in China, to analyze the operational safety of high-speed railway routes by analyzing both regional land subsidence and local differential subsidence caused by groundwater drawing. The Beijing construction stratum is mainly composed of cohesive soil, and the BTR has a maximum accumulative subsidence of > 800 mm and a maximum subsidence rate of > 80 mm a−1. In this paper, finite-element software ABAQUS is used to analyze groundwater drawdown and land subsidence caused by local water drawing, and its effect on the bearing capacity of railway bridge pile foundations and the orbit concrete supporting course. The analysis provides a technical basis for developing prevention and control engineering measures against land subsidence so as to guarantee the safe operation of these high-speed railway routes.
Highlights
A large number of urban rail transit projects are under construction in Beijing
Three main phenomena are generally displayed where land subsidence occurs in relation to high-speed railway routes: uneven subsidence resulting in the changing of orbit comfort, a worsening of the structure of the subgrade and its stability, and a change in the bridge and track orbit comfort (Li et al, 2008)
Uneven subsidence of the ground surface affects the stability of bridges, orbit comfort, and produces a gradually increasing influence that eventually causes the rail bed to undulate in a series of waves (Yang et al, 2013)
Summary
A large number of urban rail transit projects are under construction in Beijing. By 2020, the city will have > 10 highspeed railway routes in operation, offering top speeds of 300 km h−1. Uneven subsidence of the ground surface affects the stability of bridges, orbit comfort, and produces a gradually increasing influence that eventually causes the rail bed to undulate in a series of waves (Yang et al, 2013). This results in increased maintenance costs and affects the safety of the railway operation performance, potentially causing adverse effects to the high-speed trains, resulting in a threat to passenger safety, lives, and property. – 0.1 10 curs, such as the Beijing–Tianjin inter-city (BTR) and the Beijing–Shanghai railway Such areas are affected in different degrees by the damage caused by differential subsidence (Yang, 2008). Stability influence: a numerical analysis of land subsidence on a high-speed railway bridge
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