对月壤静力触探实验FEM-DEM多尺度耦合的模拟研究

摘要

月壤是原位探月工程研究的直接对象,其岩土力学性质极具研究价值.静力触探实验(CPT)是一种能够快速确定月壤岩土力学性质的技术方法.利用近期研发的一种典型耦合理论,成功获得一种耦合有限元(FEM)和离散元(DEM)的静力触探多尺度模型.利用静力触探多尺度模型对不同条件下的月壤静力触探实验进行了模拟研究,定性揭示了静力触探过程中月壤颗粒的流动情况及阻力的发展情况.同时,模拟研究了刺探速度、深度以及锥尖角度和月表低重力对月壤静力触探的影响.%Cone penetration test (CPT) is an appropriate technique for quickly determining the geotechnical properties of lunar soil, which is valuable for in situ lunar exploration. Utilizing a typical coupling method recently developed by the authors, a finite element method (FEM)-discrete element method (DEM) coupled model of CPTs is obtained. A series of CPTs in lunar soil are simulated to qualitatively reveal the flow of particles and the development of resistance throughout the penetration process. In addition, the effects of major factors, such as penetration velocity, penetration depth, cone tip angle, and the low gravity on the Moon surface are investigated.