In-hole double-plunger water injection infiltration testing apparatus and working method thereof

Abstract

The invention discloses a double plunger water injection penetration tester in a hole and a working method thereof. The lower water-stop chambers all include steel pipes and expansion air bags set outside the steel pipes; the water injection test chambers include water-permeable flower tubes and water-injection cavity filter meshes set outside the water-permeable flower tubes; the water-permeable The side wall of the flower tube is provided with several through holes. The present invention has the advantages of: reducing the test cost, the test can test the soil layers of different depths in one hole; the tester can be used repeatedly, and the water is separated by air pressure expansion, reducing the one-time input of PVC pipes , and at the same time reduce the cost of the water stop outside the casing or the mud ball water barrier, saving costs.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to an in-hole double plunger water injection penetration tester and a working method thereof. Background technique [0002] Hydrological parameter testing is an indispensable and important part of hydrogeological and engineering geological exploration work. Whether the permeability of groundwater in the soil layer can be accurately tested in the process of exploration and testing, and the relevant parameters of hydrogeology can be determined. , foundation construction, etc. play an important role. [0003] At present, there is no special test instrument for measuring the permeability coefficient of groundwater in the borehole. The test method widely used in the project is to drill on-site, put a water injection pipe (PVC pipe or steel pipe) in the hole, and set up a penetration test section. The non-test section is water-blocked by expansive mud balls or waterstops...

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Problems solved by technology

[0004] The main difficulty of the existing method for measuring the permeability coefficient of the soil layer in the hole is that: it is necessary to drill and wash holes specially for the test, and the test is not conducive to combining with the drilling in the survey process; the test device needs to be specially made of water-injected steel pipes or PVC pipes, It is unfavorable to cost control and environmental protection; the test device needs to use mud balls or waterstops for water isolation, which is difficult for non-test soil layers; after the test, the PVC pipe is left in the hole, which has certain engineering risks; the test device is installed Complicated, the whole test takes a long time and requires a lot of investment, which is not conducive to the on-site test

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