Test device and test method for penetration clogging of soil

Abstract

The invention relates to a test device and a test method for penetration clogging of soil. A water draining bottom barrel, a charging barrel and a water feeding top barrel are arranged above a test tower bracket; a pore water pressure monitoring hole is formed in the lateral surface of the charging barrel; a pore water pressure sensor is arranged in the pore water pressure monitoring hole and is connected with a computer; a three-way valve structure comprising a penetration clogging specimen container tube, a water return control valve, a feeding inlet vale and a water conveying valve is arranged at the upper end of the water feeding top barrel; and a high-pressure water tank is formed by connecting a water supplying pipe with a water pump in a sump tank. Under the condition that water is continuously supplied, the feeding of the penetration clogging specimen is finished, the continuous process of a penetration clogging specimen test is realized and a traditional measuring mode by adopting a piezometer tube is changed. Multi-section seepage electronic monitoring record and data processing are adopted so as to visually reflect the correlation among the particle size of the penetration clogging, the pore water pressure and the seepage flow can be visually reflected. The influence on the observation of the penetrability of a loose medium under the condition of a penetration clogging action is overcome and reliable scientific reference for a large-scale engineering design is provided.

Description

Technical field: [0001] The invention relates to a scientific test device for dynamically changing the permeability of soil caused by seepage and silting action, which is a test for the constant change of the permeability and permeability parameters of the soil due to the migration of fine soil particles during the seepage process of the soil by simulating observation device. Background technique: [0002] The research on conventional permeability of soil is relatively mature at home and abroad. There are usually two main types of instruments for indoor determination of soil permeability in terms of test principles, namely constant head test and variable head test. The former is more suitable for coarse-grained soils with strong permeability, and the latter is more suitable for clayey soils with low permeability. [0003] The constant water head test means that the water supply head remains constant during the test. Let the thickness of the sample be L, the cross-sectiona...

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Problems solved by technology

The maximum particle size of the test soil generally cannot exceed 1 / 10 of the inner diameter of the test instrument. The American Society for Testing and Materials Standard Yearbook also requires the maximum particle size of the sample to be 1 / 8 to 1 / 12 of the diameter of the sample container. The inner diameter of Yihe Nan 55 permeameter is small, so it is not suitable for measuring the permeability coefficient of giant-grained soil and giant-grained mixed soil

The designed maximum particle size of the soil sample is 600mm, and the 70-type permeameter and the Nan55-type permeameter have small inner diameters, which are not suitable for the experimental research of coarse-grained soil; although the vertical seepage deformation meter is suitable for measuring the permeability coefficient and seepage deformation of coarse-grained soil , but the effect on the permeability of loose media under clogging conditions cannot be observed

Difficulty providing reliable data for large engineering designs

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