Receiving model test platform and test method of tunnel boring machine with mechanical method

Abstract

The invention discloses a mechanical contact channel tunneling machine receiving model testing platform and a testing method thereof. The mechanical contact channel tunneling machine receiving model testing platform is characterized in that the mechanical contact channel tunneling machine receiving model testing platform comprises a multi-ring tube segment test unit formed by tube segments in a spliced mode, a multi-ring tube segment hydraulic servo soil pressure simulation system, a contact channel stratum simulation system and a receiving sleeve, wherein the multi-ring tube segment hydraulicservo soil pressure simulation system is used for simulating the real tunnel form to apply the soil pressure load to the multi-ring tube segment test unit, the contact channel stratum simulation system is used for simulating the stratum soil environment borne by the multi-ring tube segment test unit, and the receiving sleeve is used for receiving a shield tunneling machine; steel pressure-resistant bag bodies are arranged among steel-concrete composite tube segment, the multi-ring tube segment test unit, an upper transverse fixing frame and a lower transverse fixing frame, grouting tubes provided with grouting pressure adjusting valves are arranged on the upper parts of the steel pressure-resistant bag bodies, slurry outlet tubes are arranged on the lower parts of the steel pressure-resistant bag bodies, and meanwhile, a plurality of pressure sensors are evenly distributed on the outer surfaces of the steel pressure-resistant bag bodies in the annular direction. The mechanical contactchannel tunneling machine receiving model testing platform has the advantages that the soil pressure load applied to the multi-ring tube segment by a real main tunnel and the real stress-strain stateof the tunnel tube segment in the process that the shield tunneling machine goes out of the contact channel can be simulated simultaneously.

Description

technical field [0001] The invention relates to a receiving simulation platform of a roadheader, in particular to a model test platform for a roadheader receiving model of a mechanical method communication channel and a test method thereof. Background technique [0002] With the rapid development of our country's economy, the continuous development of urban construction and the continuous expansion of urban scale, the urban population has increased rapidly, and urban traffic congestion has become increasingly serious. The construction of urban rail transit is an important measure to alleviate urban traffic congestion. The subway has become an important symbol of a country's comprehensive national strength, urban economic strength, people's living standards and modernization. According to Article 19.1.22 of the "Metro Code Design" (GB50157-2003): "Between two single-track section tunnels, when the continuous length of the tunnel is greater than 600m, a connecting passage shou...

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Problems solved by technology

[0003] The construction of connecting passages in soft soil areas generally adopts the method of freezing method for reinforcement and then using mining method for excavation, but this method has disadvantages such as freezing and thawing have a great impact on the surrounding environment, long construction period, and high construction cost.

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. A series of advantages have broad engineering application prospects, but the overall construction process of the mechanical method communication channel includes: the stress change on the main tunnel structure when the shield boring machine starts cutting the main tunnel segment and the water and soil pressure behind the segment The changing law of the connecting channel, the influence of the force on the structure of the main tunnel segment behind the tunnel during the excavation construction of the connecting channel and the changing law of the earth pressure in front of the cutter head, and the force on the main tunnel segment when the shield tunneling machine cuts the main tunnel segment at the receiving end The impact of changes, etc., can only be used in the field test method, but the field test is relatively restrictive, and it is impossible to realize the effective simulation of the changing parameters.

The existing shield tunnel test platform cannot truly simulate the overall construction process of the mechanical method of communication tunnel. The shield cutting simulation test generally adopts soil box cutting simulation, which has great limitations. A mechanical method of communication tunnel boring machine is urgently needed. The receiving simulation platform and method can cooperate with the on-site construction technology of the mechanical method contact channel, and can further improve the technology

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