Method for testing water film tension effect of granular medium pushed by needle tube and application

The invention discloses a water film tension effect test method for pushing and pressing a granular medium by a needle tube and application, and the method comprises the following steps: S1, uniformly mixing the granular medium with water according to a ratio to obtain a sample; s2, adopting a needle tube device, filling the sample obtained in the step S1 into a needle tube for a plurality of times, carrying out jolt compaction or manual compaction until no obvious crack or gap exists in the needle tube is observed from the outside, recording volume scales, and weighing the mass of the granular medium filled in the needle tube; s3, slowly pushing the pushing handle at a constant speed, pushing out the granular medium in the needle cylinder until the granular medium is broken, obtaining the weight of the falling part of the granular medium and the cross section area of the broken part, and calculating the tensile force per unit area; and S4, defining a meniscus existing between the two unit granular media. The