Settlement control method in process of enabling subway tunnel to penetrate through existing railway

Abstract

The invention provides a settlement control method in a process of enabling a subway tunnel to penetrate through the existing railway. The settlement control method comprises the steps: establishing a line structure-subgrade-soil layer three-dimensional calculation model by utilizing a dynamic finite element theory to simulate and analyze deformation relations of a tunnel structure, a soil layer and a track foundation caused by subway tunnel construction at different tunnel burial depths in different excavation manners; by combining the existing subway tunnel under-through construction documents, summarizing and concluding deformation influence factors and a deformation influence rule to the existing line foundation, and an influence rule to track irregularity caused by tunnel excavation during subway tunnel under-through construction; based on correlation requirements on track static geometric dimensions and dynamic quality allowable deviation management in the existing railway deformation control index system, proposing a settlement control index in the process of enabling the subway tunnel to penetrate through the existing railway; if during construction, the real-time monitored subgrade settlement amount is over the settlement control index, giving out an alarm. The invention can relieve, eliminate and avoid adverse effects to the ground surface settlement of the crossed existing railway caused by subway construction, and provides a means to scientifically and reasonably developing safety evaluation of the subway tunnel construction.

Description

technical field [0001] The invention belongs to a method for controlling ground subsidence and deformation, in particular to a method for controlling subsidence of a subway tunnel passing through an existing railway. Background technique [0002] Transportation is closely related to social progress and development, and convenient transportation conditions are one of the basic factors for the formation and development of cities. Especially in the past ten years, the rapid economic development has made the city continue to expand, and road traffic is facing more and more serious congestion. Urban rail transit with large capacity and isolation from ground traffic has attracted widespread attention in large cities in China and has entered a period of rapid development. . By the end of 2012, 20 cities in my country have opened urban rail transit operation, and the total mileage of operation has reached 2400km. By around 2015, there will be 158 urban rail transit lines built or u...

AI Technical Summary

Problems solved by technology

Underpass construction of the subway tunnel will inevitably disturb the foundation of the existing railway, and will cause different degrees of ground settlement, which will cause deformation of the existing railway foundation and track structure, which will not only adversely affect the safety of the subway tunnel construction, but also affect the The operation safety of existing railways will cause serious damage to existing railways, causing large safety accidents and causing large economic losses

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