A method for measuring the embedding amount of sample rubber film in large-scale triaxial test of coarse-grained soil

A method for measuring the penetration quantity of a rubber membrane in large-scale triaxial test of coarse-grained soil belongs to the technical field of geotechnical tests. The measurement method ischaracterized in that a small confining pressure cyclic loading process is arranged in a conventional isotonic consolidation test, the volume variation quantity of a recoverable sample under a smallconfining pressure increment condition under different confining pressures is measured, and the measurement of the penetration quantity of the rubber membrane and the change law of the penetration quality with the confining pressure is realized based on the penetration recoverability of the rubber membrane. The measuring method is easy to implement in a conventional triaxial apparatus, has the advantages of simple operating steps and low difficulty, can be coupled to a conventional consolidation test process without affecting subsequent test, avoids the links of a development device, multi-time sample production and multi-group test in some measuring methods, effectively eliminates the influences of the individual discreteness of the sample, can accurately measure the penetration quantityof the rubber membrane changing with the confining pressure, provides a reliable technical way for correcting the volume deformation of the coarse-grained soil sample in the triaxial test, promotes the study of the mechanical properties and the constitutive model of he coarse-grained soil, and has good promotion values.