Indoor test device for measuring permeability coefficient of tunnel lining and soil pore pressure response under fluctuating water level

Abstract

The invention discloses an indoor test device for measuring permeability coefficient of tunnel lining and soil pore pressure response under fluctuating water level. The indoor test device comprises ameasurement module for stable and fluctuating water level and a measurement module for permeability coefficient of lining. The measurement module for stable and fluctuating water level comprises a Mariotte flash and a micro-lifting platform. The Mariotte flash is connected to the upper end of a soil column bucket via a hose. The interior of the soil column bucket is provided with water body, soilsample, a filter paper, a porous filter plate, and gravel from top to bottom to simulate the occurrence environment of the underwater shield tunnel. The side wall of the soil column bucket is providedwith a plurality of pressure measuring holes. The pressure measuring holes are connected to pressure measuring tubes through hoses to measure the water pressure of the water body before and after flowing through the soil sample and outside the lining. The outlet below the soil column bucket is connected to the constant water level bucket through a conversion joint to form a measurement module forpermeability coefficient of lining. The measurement module realize that the measurement of the vertical permeability coefficient of the soil sample, and the equivalent permeability coefficient of conversion joint with different pore sizes relative to soil sample. The indoor test device has the advantages of simple operation, various functions, high test precision, and small measurement error.

Description

technical field [0001] The invention belongs to the technical field of rock and soil test research, and in particular relates to an indoor test device for measuring the permeability coefficient of tunnel lining and the pore pressure response of soil under fluctuating water levels. Background technique [0002] In recent years, my country has built a large number of underwater shield tunnels in tidal sections of rivers. In addition, underwater shield tunnels such as Hangzhou Bay Underwater Tunnel and Qiongzhou Strait Tunnel are also under long-term planning. In the tidal river section, due to the repeated alternation of tides and runoff, the water level fluctuates frequently, the river bed is scoured and silted violently, and the dynamic migration of water and soil media makes the stress field and seepage field of the river bed foundation constantly change, which in turn makes the external water and soil pressure and internal force of the shield tunnel And deformation is dyn...

AI Technical Summary

Problems solved by technology

However, there is still a lack of experimental research on the water pressure response of tunnels under fluctuating water levels, and there is no reliable experience and systematic conclusions about its distribution law and evolution characteristics.

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