A comprehensive test platform for shield tunneling method and its test method

Abstract

The invention discloses, for the first time, a comprehensive testing platform of a shield tunnel and a testing method. The platform is characterized by comprising: a multi-ring tube piece testing unit; a multi-ring tube piece synchronous-transportation system, which is used for transporting a whole body of the multi-ring tube piece testing unit into a multi-ring tube piece synchronous-lifting system; the multi-ring tube piece synchronous-lifting system, which is used for synchronously lifting the multi-ring tube piece testing unit into a multi-ring tube piece hydraulic-servo earth pressure simulation system to simulate earth pressure loading positions; the multi-ring tube piece hydraulic-servo earth pressure simulation system, which is used for applying earth pressure loads to the multi-ring tube piece testing unit; the multi-ring tube piece longitudinal-load simulation system, which is used for applying longitudinal loads to the multi-ring tube piece testing unit; and a multi-ring tube piece formation simulation system, which is used for simulating a formation soil body environment to which the multi-ring tube piece testing unit is subjected. The platform has the advantages of realizing simultaneous transportation and lifting of multi-ring tube pieces, simulating real tunnel morphology, applying the earth pressure loads and the longitudinal loads to the multi-ring tube pieces,and simulating the formation soil body environment.

Description

technical field [0001] The invention relates to a tunnel comprehensive test platform and a test method, in particular to a shield tunnel comprehensive test platform and a test method. Background technique [0002] A communication channel should be set up between the two single-line interval tunnels of urban rail transit. The construction of the communication channel in soft soil areas is generally reinforced by the freezing method and then excavated by the mining method. However, this method has a great impact on the surrounding environment and a long construction period. , High construction costs and other shortcomings. The mechanical method of communication channel construction refers to the method of using pipe jacking or shield cutting to cut tunnel segments and soil, and assembling pipe joints or segments to form communication channels. It has high safety, little impact on the surrounding environment, and fast construction speed, etc. It has a series of advantages and ...

AI Technical Summary

Problems solved by technology

[0002] A communication channel should be set up between the two single-line interval tunnels of urban rail transit. The construction of the communication channel in soft soil areas is generally reinforced by the freezing method and then excavated by the mining method. However, this method has a great impact on the surrounding environment and a long construction period. , High construction cost and other disadvantages

The mechanical method of communication channel construction refers to the method of using pipe jacking or shield cutting to cut tunnel segments and soil, and assembling pipe joints or segments to form communication channels. It has high safety, little impact on the surrounding environment, and fast construction speed, etc. It has a series of advantages and has broad engineering application prospects. However, in view of the stress change of the main tunnel structure during the construction of the mechanical method of connecting passages and the cutting efficiency of the mechanical starting and receiving process, only field tests can be used, but field tests are restrictive. Relatively large, unable to achieve effective simulation of changing parameters

[0003] The traditional shield tunnel test platform adopts the horizontal loading method, and loads through the symmetrical tension self-balancing system to explore the mechanical properties of the tunnel. However, in this method, the tunnel segments cannot "stand", and thus cannot simulate the gravity of the tunnel itself. The effect of soil compression and deformation cannot truly reflect the stress of the tunnel structure. On the other hand, the symmetrical tension and self-balancing loading method cannot consider the asymmetrical load such as tunnel segment cutting.

Chinese patent CN106501014A discloses a vertical loading test device for a full-ring tunnel structure, which only explores the mechanical properties of a single-ring vertical segment tunnel structure, and cannot reflect the transmission and redistribution of longitudinal internal forces between the rings. Moreover, the simulation of cutting segments by shield machines is not competent; therefore, none of the existing shield tunnel test platforms can truly simulate the construction process of the mechanical communication channel, and there is an urgent need for a method that can simultaneously transport and support multiple ring segments For example, the shield tunneling comprehensive test platform and test method for simulating the real tunnel shape, applying earth pressure loads, longitudinal loads and simulating the stratum soil environment to multi-ring segments

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