Drainage type segment lining model pore hydrostatic test device

Abstract

The invention discloses a drainage type segment lining model pore hydrostatic test device. An inner die (3) which is constructed by a circular PVC (Poly Vinyl Chloride) tube is longitudinally arranged in a box body (1) of the device; the lower part of the inner die (3) is provided with inner die drainage holes (3a); a water outlet end of the inner die (3) extends out of a side wall of the box body (1); a water storage container (8) is arranged below the water outlet end of the inner die (3); a steel outer die (2) is sleeved outside the inner die (3) and is provided with outer die drainage holes (2a) with the same circumferential positions as the inner die drainage holes (3a); the number of the inner die drainage holes (3a) is less than or equal to that of the outer die drainage holes (2a); and any inner die drainage hole (3a) is aligned with a corresponding outer die drainage hole (2a). The test device is easy for test operation, has a short test period, high test data accuracy and high reliability and can provide a more effective, reliable and accurate test basis for design and construction of a shield tunnel, so that safety and economy of the tunnel are guaranteed better.

Description

technical field [0001] The invention relates to a segment lining model pore water pressure test device for a shield tunnel, in particular to a drainage type segment lining model pore water pressure test device. Background technique [0002] It is an important means to study the influence of the drained segment lining on the pore water pressure of the surrounding rock and the discharge rate by using the model pore hydraulic test device of the drained segment lining to conduct the indoor model pore hydraulic test. [0003] The existing drainage-type segment lining model pore water pressure test device includes a closed pressure-bearing box, a tunnel model composed of circular PVC pipes is arranged longitudinally in the box, a drain hole is opened in the lower part of the model, and the water outlet of the model is The end protrudes from the side wall of the box, and a water storage container is placed under the water outlet of the model. The top wall of the box is provided wit...

AI Technical Summary

Problems solved by technology

[0005] Existing problems with the existing test device are: except for the first test, before each test, it is necessary to drain the remaining water of the previous test, take out the sand filled in the previous test, and then replace the PVC pipe tunnel model, And refill the soil, arrange piezometric pipes; inject water until the seepage is basically stable, and then start the test

Its operation is extremely cumbersome

It takes about ten days from water injection until the seepage is basically stable, and the test period is long; and because the sand filled in each time cannot be guaranteed to be completely consistent, the simulated stratum structure has unpredictable changes between tests, resulting in various tests. The results cannot be established on the basis of consistent physical and mechanical parameters of the model soil, the comparability of the test data is poor, and the data obtained from the analysis have large errors, and the accuracy and reliability of the test basis for design and construction need to be improved

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