低约束应力下模拟月壤的变形参数及其预测模型  

The Deformation Parameters of Lunar Regolith Simulant and Its Prediction Modelin Low Restraint Stress

作　　者：王协群[1] 黄婷婷[1] 张俊峰[2] 陈轮[3] 邹维列[2] 

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]武汉大学土木建筑工程学院,武汉430072 [3]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《武汉理工大学学报》2015年第8期62-65,71,共5页Journal of Wuhan University of Technology

基　　金：武汉理工大学自主创新研究基金(145206003)

摘　　要：在进行探月装置与月壤的相互作用研究中,需要月壤的变形参数。而月球的低重力环境对月面浅层月壤力学特性的影响是很大的。为此,利用清华大学模拟月壤（QH-E）,采取GCTS动/应力路径三轴仪,实施一系列低围压水平（3.13～25kPa）下的三轴固结排水剪切试验,获得了围压和相对密度对QH-E切线模量、剪切模量和剪胀角等变形参数的影响规律,进而提出变形参数的预测模型。结果表明：1）在3.13～25kPa的低围压水平下,QH-E的切线模量E、剪切模量G都随着围压和相对密度的增大而增大;2）在低压范围内,相对密度增大,剪胀角增大;围压增大,剪胀角降低;3）利用本次试验数据的比较,表明所提出模型的预测精度是较高的。During the study of interaction between lunar explorations and lunar regolith,it is necessary to investigate deformation parameters of lunar regolith.Moreover,low gravity surrounding on the moon has a great impact on mechanical properties of lunar regolith in the shallow lunar surface.Therefore,a series of atypical triaxial compression experiments used GCTS Action/stress path triaxial were conducted on QH-E lunar soil simulant which was developed by Tsinghua University at low confining stresses（3.13～25kPa）.The regular of confining pressure and relative density on deformation parameters was gotten,e g,QH-E tangent modulus,shear modulus and dilatancy angle,and so on.The prediction model of deformation parameters was put forward.The experimental results indicate that QH-E at low confining stresses（3.13～25kPa）shows the conspicuous dilatancy behavior.QH-E tangent modulus,shear modulus and dilatancy angle increase with the increasing confining pressure and relative density at the low confining stresses（3.13～25kPa）.Dilatancy angle increases with higer relative density at the low confining stresses;dilatancy angle is smaller when confining stresses increases.The results show that the model we proposed has higher prediction accuracy.

关 键 词：QH-E模拟月壤 低围压 相对密度 变形参数 

分 类 号：TU411[建筑科学—岩土工程]