Abstract
With the rapid development of railway construction and the massive exploitation of mineral resources, many railway projects have had to cross mining areas and their caverns. However, the settlement of the ground surface may cause severe damage to human-built structures and lead to the loss of human lives. The research on ground deformation monitoring over caverns is undoubtedly important and has a guiding role in railway design. Settlement observation points were set up around the mine, establishing a ground subsidence monitoring level network that has been in operation for 11 years. The ground settlement and lateral displacement along the designed railway were studied. A finite element model was established to predict the long-term ground settlements over the mined-out region induced by designed railway embankment construction and train operation. The results show that the predicted ground settlement induced by railway embankment construction is smaller than the ground settlement induced by the mined-out cavity. One train pass-by has an insignificant impact on the safety of train operation. However, when the number of train pass-bys increases to 10,000,000 times and 20,000,000 times, the cumulative deformations of the ground at different depths are quite large, which may affect the safety of the railway operation. Thus, it is necessary to deal with settlement issues when designing railway construction.
Highlights
In China, railway is an important national infrastructure and a popular means of transportation, which plays a key role in China’s comprehensive transportation system
A finite element model was established to predict the long-term ground settlements over the mined-out region induced by railway embankment construction and train operation
If the ground settlement analysis of the monitoring points only focuses on a single point, the actual settlement of the mining area cannot be explained
Summary
In China, railway is an important national infrastructure and a popular means of transportation, which plays a key role in China’s comprehensive transportation system. Using numerical analysis to analyze the ground and building foundation deformation and stability over mined-out regions becomes an effective and applicable method. A railway was designed inevitably to cross a mine area The construction of this railway plays an important role in improving the regional railway network structure, improving the radiation capacity of the railway network, improving the inter-city transport capacity of the Pearl River Delta, and optimizing the transport organization. It develops the railway system as a ring junction pattern with goods outside and passengers inside, and realizes the separate operation of passenger and cargo lines. A finite element model was established to predict the long-term ground settlements over the mined-out region induced by railway embankment construction and train operation. The safety of the railway construction was comprehensively evaluated to explore the feasibility of railway construction over the mined-out region
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