Method for testing permeability stability of sand gravel material

Abstract

The invention relates to a method for testing permeability stability of sand gravel material, belonging to the technical field of geotechnical engineering for testing the permeability stability of coarse grained soil in basic geotechnical test of the geotechnical engineering. The method comprises the following steps of: detecting tightness of an instrument, washing the instrument, filling tested material, measuring a numeral value by the instrument, calculating and detecting bearing force of the tested material, and the like. The method can control a permeating water head and water inlet quantity; and the permeating water head is controlled by relative position relationship between two overflow devices. Permeated muddy water is guided into a mud sand settlement separating box from the bottom by a water guiding pipe; the muddy water is separated backwards under the action of gravity; the mud sand is completely separated with good effect; the load of a load pressuring system is controlled by the number of poises; settlement quantity of the sand gravel material is controlled by displacement measurement starry sky; mass change of the mud sand settlement separating box is recorded by amass measuring system; the design of the test process can simultaneously record various test data, and the data reliability is high.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering for testing the seepage stability of coarse-grained soil in the basic geotechnical test of geotechnical engineering, and relates to a test method for the seepage stability of sand and gravel materials. Background technique [0002] Non-cohesive sand and gravel coarse-grained soil is often encountered in engineering construction, and it is directly crushed into sand and gravel building materials through a stone crusher, which is used in roadbed filling of mountainous expressways, large rockfill dams, rivers, lakes and sea bank revetment and embankment projects, etc. , in all kinds of engineering construction, especially in road engineering, the amount of non-cohesive sand and gravel coarse-grained soil is much larger than that of cohesive fill, and it is widely used in foundation engineering construction. Compared with other soil types, non-cohesive sandy gravel coarse-grained soil...

AI Technical Summary

Problems solved by technology

From the scope of application, none of the above test instruments can test the seepage deformation of coarse-grained sand and gravel, let alone evaluate the permeability stability index of coarse-grained sand and gravel under a certain load.

The newly developed sand and gravel material permeability stability tester can measure the permeability stability index of sand and gravel material, but the specific test process, test precautions, test result processing, and penetration stability index acquisition are still in a blank state. Standardize the acquisition of stability indicators to form the test specifications for the determination of seepage stability indicators of coarse-grained soils

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