Settlement prediction method for metro tunnel shield undercrossing existing railway facilities

Abstract

The invention provides a settlement prediction method for metro tunnel shield undercrossing existing railway facilities. The method comprises the steps of using ABAQUS software in the finite element software to establish a three-dimensional calculation model of a soil-layer-subgrade-railway structure, calculating a vertical settlement displacement of the existing railway foundation and track, arrangingactual undercrossing construction materials of subway tunnel site including geological conditions, construction methods, section forms and dimensions, buried depth, settlement control indexes during construction and actually measured settlement data, combining the results of numerical analysis, summarizing the influence rules of deformation caused by the excavation work in the metro tunnel undercrossing construction to the existing railway foundation and track, making the comparison between the predicted value and the settlement control index stipulated in the existing railway deformation control index system in construction engineering, and based on the comparison results, adjusting shield parameters, excavation methods and excavation depth. The settlement prediction method for metro tunnel shield undercrossing existing railway facilities can in advance take corresponding reasonable shield parameters for tunnel excavation, and implement technical control measures of the settlement of surface facilities and settlement monitoring and control techniques.

Description

technical field [0001] The invention relates to a settlement prediction method. In particular, it relates to a settlement prediction method for subway tunnel shield tunneling under existing railway facilities. Background technique [0002] In recent years, urban rail transit has entered a period of great development. At present, there are 28 cities in my country whose subway construction projects have been approved. Urban rail transit, with its huge advantages of fast, safe and low-carbon, is destined to change the way people travel , become the first choice of people's travel mode. In the construction of underground infrastructure such as urban underground railways in various countries in the world, the shield tunneling method is mainly used for construction. According to the statistics of major cities such as Tokyo and Osaka in Japan in 1991, among the urban tunnel projects with a total extension of 75,224 meters, the mining method accounted for 6.1%, the shield method ac...

AI Technical Summary

Problems solved by technology

[0004] The advantages of using tunnels to cross existing railways and highways for new or reconstructed railways are very prominent, but tunnel construction will inevitably cause disturbance to the foundations of existing railways and highways, and will inevitably produce different degrees of ground settlement, which will cause existing railways Deformation of subgrade and track, as well as existing road subgrade and pavement, will not only adversely affect the safety of railway construction and the surrounding environment, but also affect the safe operation of existing lines, and seriously cause damage to existing railways and roads, causing serious Large safety accidents and large economic losses

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