A method for determining the dynamic load of subway operating trains and long-term settlement of tunnels
A dynamic load and axle dynamic load technology, applied in surveying and mapping and navigation, measuring devices, instruments, etc., can solve the problem of not considering the influence of rails, inability to accurately determine the tunnel settlement, and the number of train cyclic loading does not give a clear and reliable analysis and other problems, to achieve the effect of easy promotion, great application value, and simple method
Inactive Publication Date: 2016-11-30
SHANGHAI JIAO TONG UNIV
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This paper considers the dispersion effect of the tunnel lining on the load transfer, but does not consider the influence of the rails and fasteners on the load. At the same time, it does not give a clear and reliable analysis of the cyclic loading times of the train, so it is impossible to accurately determine the tunnel caused by the train load. Settlement
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[0050] A subway tunnel is located in the soft soil layer in the downtown area of Shanghai, and the bottom of the tunnel is buried at a depth of 13.6m. Since its operation, the settlement of the subway tunnel has been increasing. In this embodiment, the corresponding design parameters and soil layer information are obtained first. Specific steps are as follows:
[0051] The first step is to obtain the general situation of subway operating trains and the design parameters of tunnels, ballast beds and tracks.
[0052] The subway line uses A-type trains, which consist of 8 cars. The first and last cars are 23.69m long and have an axle load of 150kN. The remaining six cars are each 22.1m long and have an axle load of 160kN. The distance between the first and second wheel axles is 2.5m, the distance between the second and third wheel axles is 13.2m, and the distance between the third and fourth wheel axles is 2.5m; the operating speed of the train is 60km / h, and the average depa...
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Abstract
The invention provides a method for determining a dynamic load of a subway operating train and long-term settlement of a tunnel. The method comprises the steps: step 1, determining a subway operating train axle dynamic load; step 2, establishing a load-steel rail-fastener-tunnel-foundation mechanics coupling model, and determining a loading force and loading times of a single train on the soil below the train; step 3, establishing a two-dimensional finite element model, sequentially analyzing the tunnel excavation and train load loading, and determining an initial deviator force of the soil under the tunnel and a dynamic deviator force caused by the train load; step 4, determining accumulated plastic strain of the soil under the tunnel according to results of the steps; and step 5, determining accumulated settlement of the tunnel caused by the train load, and drawing a tunnel settlement curve. By adopting the method, the dynamic load of the subway operating train and the long-term settlement of the tunnel can be more accurately determined. The method is simple, convenient to popularize and suitable for analyzing and controlling the long-term settlement of soft soil shield tunnel under the effect of the train load.
Description
technical field [0001] The invention relates to a method in the technical field of construction engineering, in particular to a method for determining the dynamic load of a subway operating train and the long-term settlement of a tunnel. Background technique [0002] In order to alleviate the huge pressure on urban traffic brought by the rapidly increasing population in the process of urbanization, many cities in my country, especially the developed coastal cities, have vigorously carried out subway construction. Coastal areas often deposit deep Quaternary littoral facies or river alluvial soft soil, which has high water content, high compressibility, and complex geological conditions. Subway tunnels in soft ground are often constructed using the shield method, and the lining is made of concrete segments spliced together. With the increase of shield tunnel operation time, shield tunnels in soft ground are prone to deformation and settlement. The long-term settlement of t...
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IPC IPC(8): G01C5/00G01N3/00
CPCG01C5/00G01N3/00
Inventor 吴怀娜沈水龙袁斌许烨霜
Owner SHANGHAI JIAO TONG UNIV