Model testing device for influence caused by tunnel passing through landslide mass under rainfall condition

Abstract

The invention relates to a model testing device for an influence caused by a tunnel passing through a landslide mass under a rainfall condition. A model box is filled with clay to form a sliding bed which is downward from the left side to the right side; a sliding mass is arranged in the sliding bed; a tunnel lining model is horizontally placed inside a soil mass in the model box; a tunnel excavation construction simulation device is arranged in the tunnel lining model which is partitioned into a plurality of sections of tunnels; two resistance strain gauges are horizontally stuck to the inside of each section of tunnel; resistance wires with the same length are wound inside each section of tunnel and are connected with controllers through conductors; each section of tunnel is filled with paraffin; dial indicator probes are respectively fixedly arranged in an upper soil mass and a lower soil mass of the tunnel lining model and on the surface of the sliding mass and are connected with dial indicators through pre-embedded slim aluminum alloy tubes and flexible steel wire filaments arranged inside the pre-embedded slim aluminum alloy tubes; the upper end of the model box is provided with a rainfall simulation device comprising a plurality of displacement meters, a water inlet valve and a water outlet valve; and each displacement meter is fixedly arranged on the surface of the soil mass, the inside of the soil mass and the top of the tunnel through a displacement meter bracket.

Description

technical field [0001] The invention relates to a model test device for landslide disasters in highway tunnel engineering and construction engineering, in particular to a model test device for the influence of a tunnel crossing a landslide mass under rainfall conditions. Background technique [0002] With the extensive development of underground tunnel engineering, more and more complex working conditions and construction problems have appeared one after another, and the subsequent geological disasters have become more and more obvious. Especially in the mountainous areas of central and western my country where the stratum is broken, the geological conditions are complex and the climate is changeable, the development projects involving tunnels such as mines, water conservancy projects, and transportation lines will inevitably lead to landslides. The formation of the project brings a great threat to the construction and use of the project. Therefore, it is necessary to do mor...

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Problems solved by technology

The theoretical analysis method uses the theory of elasticity and simplifies the research model through assumptions, but to a certain extent, it cannot accurately consider the complex relationship between the tunnel and the landslide, and the amount of calculation is large; the numerical simulation method generally requires the use of large-scale commercial software. The establishment of the model 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

On-site monitoring method is one of the means to obtain the deformation of the surrounding soil when the tunnel passes through the landslide. 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. Buried test components are very easy to be damaged during construction, thus delaying monitoring or even obtaining wrong monitoring information

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