Servo-control earth-rockfill mixture transformation permeameter

Abstract

The invention provides a servo-control earth-rockfill mixture transformation permeameter, comprising an upper end cap, a permeating barrel, a porous disc, a lower end cap, a trolley, a servo water-adding device and a pressure-measuring device; wherein, the upper end cap and the permeating barrel can be sealed and detached; the middle of the upper end cap is provided with a water-injecting pressure pipe which can be used for adding high pressure water after being connected with the servo water-adding device; the two sides of the cylinder permeating barrel are provided with 6 water pressure measuring devices with the same interval consisting of a three-way pipe, a pressure measuring pipe for measuring low water pressure and a water pressure gauge for measuring high water pressure; water can enter into a water catchment empty chamber through the porous disc and flows out from a water outlet; the water outlet can control the water discharging speed by be connected with a water discharge switch. By using the structure, the servo-control earth-rockfill mixture transformation permeameter has the advantages that: the sample is a cylinder with the diameter being 300mm and the height being about 600mm and is earth-rockfill mixture comprising coarse grained rock and earth; water can be added in a sealed servo manner, and the water entering speed and pressure can be servo controlled, thus finishing the permeating tests of both low water head and high water head; the upper part and the lower part of the permeameter can be detached, thus realizing safe, simple and convenient use.

Description

technical field [0001] Technical Field of Rock and Soil Penetration Experiment Background technique [0002] In geological engineering, the Quaternary loose accumulation body is a mixture of soil and rocks that exists widely, and its material composition is mainly gravel, rocks, sand, clay, etc. For this kind of soil-rock mixture formed by natural accumulation, the rock particle size is relatively large, and the existing conventional permeameters cannot meet the requirements of the "Soil Test Regulations" (SL237-1999) that the inner diameter of the permeameter should be the maximum particle size of the test material 8- 10 times the requirement, and most of the existing permeameters are normal pressure head tests, which cannot meet the requirements of the permeability test of the sample under high water pressure of the soil-rock mixture. Contents of the invention [0003] The invention provides a servo-controlled soil-rock mixture pressure swing osmometer, which is charact...

AI Technical Summary

Problems solved by technology

For this kind of soil-rock mixture formed by natural accumulation, the rock particle size is relatively large, and the existing conventional permeameters cannot meet the requirements of the "Soil Test Regulations" (SL237-1999) that the inner diameter of the permeameter should be the maximum particle size of the test material 8- 10 times the requirement, and most of the existing permeameters are atmospheric pressure head tests, which cannot meet the permeability test requirements of samples under high water pressure of soil-rock mixtures

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