Riverbed permeability coefficient testing device

Abstract

The invention relates to the technical field of hydraulic engineering, and discloses a riverbed permeability coefficient testing device. The device comprises a sampling unit and a leakage unit, the sampling unit comprises a sampling pipe and a piston assembly; the bottom end of the sampling pipe is open, so that a riverbed soil sample enters the sampling pipe; the piston assembly is detachably inserted into the sampling pipe in a sealed mode and can reciprocate in the axial direction of the sampling pipe relative to the sampling pipe, the sampling unit further comprises a bottom end cover detachably arranged at the bottom end of the sampling pipe in a covering mode, and the bottom end cover is arranged to allow water to pass and prevent a riverbed soil sample from passing; the leakage unitcomprises a water seepage barrel, and the water seepage barrel is arranged to allow the sampling unit to be vertically inserted for a penetration test. The riverbed undisturbed soil sample can be conveniently and rapidly collected through the sampling unit, the sampling efficiency is greatly improved, interference of river water flow can be eliminated through the seepage unit for a seepage test,the flexibility and operability of the test are improved, and the test efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to a river bed permeability coefficient testing device. Background technique [0002] The methods for obtaining the river bed permeability coefficient in the field mainly include micro-water test method, pumping test method, water seepage meter method and water head drop standpipe test method, etc. Compared with other methods, the standpipe method uses less material, is lower in cost, and is easier to operate, so it is widely used in the determination of field river bed conductivity. The traditional standpipe method is to drive a single pipe (steel pipe, plexiglass pipe, etc.) of a certain length and diameter into a certain depth below the river bed, inject water into the pipe, and measure the descending rate of the water in the pipe to calculate the permeability coefficient of the river bed. [0003] Although the standpipe method has become a relatively matur...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a river bed permeability coefficient test device to solve the problems of difficult sampling, low sampling efficiency, and easy interference from the field environment during the test in the existing river bed permeability coefficient test.

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