Indoor model testing apparatus for analyzing influences of shield tunnel grouting construction on adjacent pile foundations

Abstract

The invention relates to an indoor model testing apparatus for analyzing influences of shield tunnel grouting construction on adjacent pile foundations. The indoor model testing apparatus comprises a model box, a tunnel grouting construction simulator, a tunnel lining model and a pile foundation model. The model box is filled with sandy soil mass, the tunnel lining model comprises longitudinally-segmented aluminum alloy hollow pipes and is placed in the left half part of the model box, and lining segments are separated by annular thin rubber plates; the pile foundation model is placed in the right half part of the model box and vertical to the tunnel lining model; a displacement meter support is fixed to the top surface of the model box; multiple displacement meters are respectively fixed to the corresponding sandy soil mass and the surfaces of piled raft foundations of the pile foundation model through the displacement meter support; the tunnel grouting construction simulator comprises a latex film surrounding the periphery of the tunnel lining model and an annular liquid cavity formed between the tunnel model and the latex film, the annular liquid cavity is filled with grouting liquid, one end of the annular liquid cavity is connected with a liquid injection guide pipe provided with a liquid injection solenoid valve, and a liquid discharge guide pipe provided with a liquid discharge solenoid valve is arranged at the other end of the annular liquid cavity in the horizontal direction.

Description

technical field [0001] The invention relates to shield tunnel grouting construction in urban underground space development and underground construction engineering, in particular to an indoor model test device for the influence of shield tunnel grouting construction on adjacent pile foundations. Background technique [0002] With the further development of urbanization in our country, urban underground rail transit, as the most convenient and efficient urban transportation system, has also developed rapidly. In particular, the construction of urban subway tunnels with the shield method is more and more widely used in the construction of subway tunnels because of its high degree of construction automation and the advantages of less impact on ground traffic. The grouting behavior is the process of injecting liquid concrete into the gap formed between the lining of the shield tunnel and the surrounding soil, so as to control the deformation of the soil and improve the integrit...

AI Technical Summary

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 piles and soil, and the amount of calculation is large; the numerical simulation method generally requires the use of large-scale commercial software, and the numerical model Complicated and time-consuming to set up

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 deformation data of adjacent pile foundations caused by 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. The test components are easily damaged during construction, thus delaying monitoring and even obtaining wrong monitoring information

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