Method for judging internal stability of coarse-grained soil

Abstract

A method for judging the internal stability of coarse-grained soil comprises the following steps: (1) performing a particle size analysis test on a coarse-grained soil filler to obtain a grading feature particle size d3 of the filler, and measuring the moisture content and the particle density of the filler; (2) performing compacting according to a set density of the coarse-grained soil filler toform coarse-grained soil, determining the porosity n of soil, and measuring the permeability coefficient of the filler under the porosity n by means of a constant head permeability test; and (3) calculating the equivalent permeability average pore diameter D according to the porosity n and the permeability coefficient K of the coarse-grained soil; and (4) comparing D with d3 to obtain the judgmentresult of the internal stability of the coarse-grained soil under the porosity n. The method is definite in principle, and simple and convenient to operate and calculate, can accurately judge the internal stability of the coarse-grained soil by use of conventional geotechnical test equipment, and provides reliable references for evaluating the structural stability of a geotechnical material.

Description

technical field [0001] The invention relates to a method for judging the internal stability of soil. Background technique [0002] In geotechnical engineering, the soil whose particle size d is 0.075mm to 60mm, which is greater than 50% of the total particle mass, is called coarse-grained soil. Coarse-grained soil is widely used in geotechnical engineering because of its good compaction performance, strong water permeability, high filling dry density, high shear strength and bearing capacity, and small settlement deformation, such as for earth-rock dams and Filling of subgrade engineering and replacement of filling materials in soft soil foundation treatment. However, the particle size composition of coarse-grained soil is dispersed, the pores between particles are large, and the cohesion between particles is small. Under the action of seepage, it is accompanied by poor internal stability, that is, the problem of seepage damage is prone to occur under the action of water se...

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Problems solved by technology

It can be seen that the pore volume-surface area equivalent capillary model ignores the actual tortuous seepage path, which also leads to large errors in the judgment results of the internal stability of coarse-grained soil fillers

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