Sand rain device for preparing geotechnical centrifugal model test and preparing method thereof

Abstract

The invention relates to a sand rain device for preparing a geotechnical centrifugal model test and a preparing method thereof, and belongs to the technical field of geotechnical engineering physical simulation, and discloses a sand rain device and method for preparing the geotechnical centrifugal model test. The sand rain device comprises a suspending electronic scale, a brake pulley, a sand box and a model box, wherein the suspending electronic scale, the brake pulley and the sand box are sequentially connected through lifting ropes; a circular level is embedded into the top of the sand box, sand outlets and a laser range finder are arranged at the bottom of the sand box, the sand outlets are uniformly distributed, penetrate through the bottom of the sand box and are in a big-end-up funnel shape, screen cloth is arranged on openings at the two ends of each sand outlet, and an electric ball valve is arranged in each sand outlet and is composed of an electric actuating mechanism and a ball valve; a control panel is arranged outside the side wall of the sand box, a control knob and an electronic screen are arranged on the control panel, the control knob is connected with the input control end of the electric actuating mechanism of the electric ball valve through a wire, and the electronic screen is connected with the laser range finder through a single chip microcomputer.

Description

technical field [0001] The invention discloses a sand rain device for preparing geotechnical centrifugal model tests and a preparation method thereof, belonging to the technical field of geotechnical engineering physical simulation, and relates to a sand rain device and method for preparing geotechnical centrifugal model tests. Background technique [0002] The sand rain method converts the gravitational potential energy of sand particles into kinetic energy, and uses the impact and collision between sand particles to rearrange the sand particles to obtain a certain density. Because the sample preparation process is very close to the natural formation process of flow deposition and aeolian sand layer, it is one of the four commonly used sample preparation methods for cohesionless soils, and it is also widely used in geotechnical centrifugal model tests. The sand rain method mainly obtains a homogeneous sand sample by controlling the relative density, but there are many inf...

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Problems solved by technology

[0004] However, the cross-sectional area of ​​the sand outlet in the above-mentioned sand raining device is much smaller than the model box, and the sand outlet needs to move horizontally during the sand spreading process, which inevitably introduces two kinds of movement path and average moving speed of the sand outlet. Influencing factors, it is difficult to guarantee the overall uniformity and repeatability of sand samples

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