Measuring method capable of simulating lunar soil mechanical properties in low-gravity environment

Abstract

The invention discloses a measuring method capable of simulating lunar soil mechanical properties in low-gravity environment. According to the method, a special low-gravity environment simulation device is used, through an inclined test table, low-gravity environment is simulated in component force directions, and various component forces generated in the inclination process are related to the inclination angle; in the simulation process, the force-bearing condition inside the soil mass is detected through a granular mixture force distribution test, so that the detection is taken as a basic test of the measuring test for simulating the lunar soil mechanical properties; the method is used for evaluating mechanical property parameters of the simulated lunar soil in a 1g of gravity field and a low-gravity field, wherein the parameters include subsidence index n, cohesion deformation modulus KC, friction deformation modulus k phi, internal friction angle phi, cohesion c, and cone index CI value; and the parameters can be obtained through a pressure-bearing characteristic test, a shear characteristic test and a penetration characteristic test for simulating lunar soil. According to the measuring method, the special low-gravity environment simulation device is utilized, and the test of simulating soil mechanical parameters in the 1g of ground gravity environment and the low-gravity environment can be finished simultaneously, so that the differences of the mechanical properties of the lunar soil in different gravity fields can be comparatively analyzed, and the interaction relation of soil machines in deep space gravity environment can be revealed.

Description

technical field [0001] The present invention relates to the technical field of geotechnical testing. Specifically, it relates to a method for measuring the mechanical properties of simulated lunar soil in a low-gravity environment. Background technique [0002] The lunar soil is on the surface of the moon, which is different from the formation process of the earth's soil. It is in the O 2 , Formed by impact, bombardment and other processes in the absence of water, etc., and has the characteristics of loose, non-consolidated, and fine particles. [0003] The lunar surface gravity environment is 1 / 6 of the ground gravity. The low gravity environment makes the binding force between lunar soil particles smaller than the binding force between simulated lunar soil particles in the surface environment, which in turn affects the pressure bearing and shear resistance of the lunar soil. In order to ensure the smooth implementation of missions such as lunar surface inspection, sampli...

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Problems solved by technology

Among them, the aircraft parabolic flight method and the drop tower method are expensive to test, the time to obtain a low-gravity environment is short, the performance is unstable, and the reproducibility is poor, and the types and times of tests that can be completed are limited; the gravity compensation method (suspension method) is not suitable. It is suitable for studying the mechanical properties of lunar soil in a low-gravity environment; it is difficult to find suitable lightweight materials as raw materials for preparing simulated lunar soil by light soil method; computer simulation method strongly relies on basic models and comparable test data, and available and reliable Experimental data are quite limited

[0005] In summary, the existing test methods for simulating the mechanical properties of lunar soil are difficult to study the influence of low gravity environment on the mechanical properties of simulated lunar soil

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