Indoor model experience device with existing tunnel affected by double subway construction

Abstract

The invention belongs to the field of tunnel engineering, and particularly relates to an indoor model experience device with an existing tunnel affected by double subway construction. The experience device mainly comprises a subway excavation simulating device, a tunnel model, a strainometer, a displacement support frame, a displacement meter, and the like. A hollow aluminum pipe is arranged in the middle of the tunnel excavation simulating device, a rubber membrane filled with water is arranged on the periphery of the tunnel excavation simulating device, and soil deformation which is caused by the tunnel excavation is simulated by drainage of water with a certain size. The tunnel model is simulated by aluminum alloy pipes, and the outer wall of the tunnel model is pasted with the strainometer in a full-bridge mode to achieve strain measurement on the existing tunnel. The displacement meter is fixed on the displacement support frame, and measurement on longitudinal settlement of the existing tunnel can be achieved. The indoor model experience device with the existing tunnel affected by the double subway construction can conveniently and effectively simulate the existing tunnel deformation caused by the double subway construction of a city, and has important reference value for establishing a tunnel construction security traversing technology standard and an adjacent structure security protective measurement.

Description

technical field [0001] The invention belongs to the field of tunnel engineering in urban underground space development and underground construction engineering, and particularly relates to an indoor model test device for existing tunnels affected by double-track subway construction. technical background [0002] At present, my country's urbanization level is rapidly improving, and the pace of urban underground rail transit construction is also accelerating. As an optimal method for urban subway tunnel construction, the shield method is more and more widely used in subway tunnel construction due to its advantages of high degree of construction automation and less impact on ground traffic. However, during the construction of the subway tunnel, deflection will inevitably occur to the surrounding soil. When the excavation of the shield tunnel causes the displacement and deformation of the surrounding soil to exceed a certain limit, it will endanger the adjacent existing subway t...

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Problems solved by technology

Numerical simulation methods generally require the use of large-scale commercial software, and the establishment of numerical models is complex and time-consuming

In addition, due to the limitations of geotechnical testing equipment, it is difficult to obtain accurate soil physical and mechanical parameters, and changes in soil parameters have a great impact on numerical simulation results, so it is easy to cause deviations in calculation results

The on-site monitoring method is one of the means to obtain the deformation data of the adjacent tunnel caused by the subway construction. However, due to the limitations of equipment and human observation factors, the on-site test results have certain deviations. At the same time, on-site monitoring requires a certain amount of manpower and material resources. Components are easily damaged during construction, thus delaying monitoring and even obtaining wrong monitoring information

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