TJ-1模拟月壤承载特性室内试验研究

Indoor experimental research on bearing behaviour of TJ-1 lunar soil simulant

本研究自行设计加工了一套可以实现位移速率控制的加载装置,采用TJ-1模拟月壤为地基材料,把着陆器足垫作为基础进行了位移速率控制条件下的载荷模型试验,并采用了3种不同方法计算足垫基底的平均应力。通过对试验结果的分析对比得出以下主要结论:足垫的地基承载力和变形模量随加载速率大致呈线性增加,按足垫与地基的实际接触面积计算的极限承载力稍大于按足垫最大上口面积计算得到的地基承载力。考虑到安全储备建议采用按最大上口面积计算所得地基承载力。足垫基础下按实际接触面积计算得到的变形模量介于按足垫最小底面和最大上口面面积计算的结果之间。

A loading device with the displacement rate control is developed for the model loading tests. Under the condition of displacement rate control, the indoor model loading tests are conducted on the TJ-1 lunar soil simulant by using a foot pad as footing. The average stress of the foot pad bottom is calculated with three different methods. The main conclusions from the analysis of the test results are as follows. The bearing capacity and deformation modulus under the foot pad increase approximately linearly with the loading rate. The bearing capacity calculated using the actual contact area between the bottom of foot pad and the TJ-1 lunar soil simulant is a little larger than that calculated using the maximum section area of the foot pad. The bearing capacity calculated using the maximum section area of the foot pad is recommended for the safety stock. The deformation modulus calculated using the actual contact area under the foot pad loading is between those calculated using the maximum and minimum section areas of the foot pad.