Device and method for determining permeability coefficient of coarse-grained soil with super large grain size

Abstract

The invention relates to a device and a method for determining parameters of a hydraulic engineering material and particularly relates to a device and a method for determining the permeability characteristic of coarse-grained soil with super large grain size (the d85 is larger than or equal to 60mm and smaller than or equal to100mm), and the IPC (International Patent Classification) codes of the device and the method are respectively E02D1 / 04 and E02D33 / 00. The device comprises a testing drum, an automatic compression system 11 and a pressure determining tube 12, wherein a plurality of pressure determining holes are formed in the wall of the testing drum, the pressure determining holes in the wall of the testing drum can be used as air discharge holes when air is discharged out of soil body from saturation, and the pressure determining holes and air discharge holes in the drum top and the drum bottom jointly accelerate air discharge, so that a sample can be saturated rapidly. Proven by a large number of experiments, the method has the advantages that hot water at the temperature of 25-40 DEG C is used, the sample with super large grain size cab be saturated rapidly and the influences on the chemical and physical stability of the sample are minimized.

Description

Technical field: [0001] The present invention relates to a parameter measuring device and method for water conservancy engineering materials, in particular to a device and method for measuring super-large-sized coarse-grained soil materials (particle size 60mm≤d) selected in engineering. 85 ≤100mm) to measure the device and method of permeability characteristics, its IPC international patent classification number is E02D1 / 04 and E02D33 / 00. Background technique: [0002] In the construction of water conservancy, transportation, railway and other projects, coarse-grained soil is often used as the basic material. Coarse-grained soil According to the "Soil Classification Standard" (GBJ145-90), coarse-grained soil refers to particles with a particle size greater than 0.075mm and less than 60mm. [0003] In water conservancy projects, coarse-grained soil is often used as dam foundation and embankment foundation materials; in railway and highway projects, it is often used as roadb...

AI Technical Summary

Problems solved by technology

[0005] The inventor designed a special test instrument through the research of the previous equipment and the analysis of the characteristics of the coarse-grained soil with super large particle size selected in the existing project, and designed a large number of pressure measuring vents on the outside of the test cylinder wall to solve the problem of the test. The sample diameter is large, and it is difficult to exhaust and saturate the test problem, so that the test instrument can test the permeability characteristics of coarse-grained soil with a super-large particle size of d85≥60mm

Images