CE-5号高钛模拟月壤固体试件单轴受压本构模型  

Constitutive model of CE-5 simulated lunar soil solid specimens under uniaxial compression

作　　者：徐桂弘 唐红[2] 庞荣华 任旭 段莉 XU Guihong;TANG Hong;PANG Ronghua;REN Xu;DUAN Li(School of Civil Engineering,Guizhou Institute of Technology,Guiyang,Guizhou 550001,China;Institute of Geochemistry,Chinese Academy of Sciences,Guiyang,Guizhou 550001,China)

机构地区：[1]贵州理工学院土木工程学院,贵州贵阳550001 [2]中国科学院地球化学研究所,贵州贵阳550001

出　　处：《岩石力学与工程学报》2024年第11期2823-2831,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然基金资助项目(51868009);贵州省科技计划项目(黔科合基础-ZK[2022]重点027);黔科合平台人才项目(GCC[2023]053)。

摘　　要：采用CE-5号(嫦娥五号)模拟月壤为主要材料,通过掺入无机固化剂制作3种配合比的试验样品(YR-1,YR-2,YR-3),采用万能伺服液压机(100 kN)施加竖向荷载,获取应力-应变曲线,采用扫描电镜观测样品内部的形貌及微空洞的特征,研究月壤固化样品的破坏形态、变形性能及弹性模量等特性,通过分段分析的方法,得到CE-5模拟月壤固体样品的单轴受压本构模型。结论如下:(1)抗压强度与用水胶比及胶凝材料的用量有关,随着水胶比的降低抗压强度增大,随着固化剂用量的增大而增大。(2)固化体样品内部普遍存在较多的微空洞和微小的裂隙,当外界压力达到极限强度时,微空洞及微裂隙扩展贯通导致样品失效。(3)采用三次多项式及有理分式分别拟合应力-应变全曲线试验结果得到月壤固化体应力-应变全曲线上升段及下降段,提出月壤固化体试件分段式本构模型,模型计算结果与试验曲线吻合良好,为实现月壤工程的技术化分析提供理论基础。Using CE-5(Chang'e-5)simulated lunar soil as the main material,three types of experimental samples(YR-1,YR-2,YR-3)were made by adding inorganic curing agents.A universal servo hydraulic press(100 kN)was used to apply vertical loads,and stress-strain curves were obtained.The internal morphology and micro cavity characteristics of the samples were observed using scanning electron microscopy.The failure morphology,deformation performance,and elastic modulus of the solidified lunar soil samples were studied.The uniaxial compressive constitutive model of CE-5 simulated lunar soil solid samples was obtained through segmented analysis.The conclusion is as follows:(1)The compressive strength is related to the water cement ratio and the amount of cementitious materials used.As the water cement ratio decreases,the compressive strength increases,and as the amount of curing agent increases.(2)There are generally many micro voids and small cracks inside the solidified sample.When the external pressure reaches the ultimate strength,the micro voids and micro cracks expand and penetrate,leading to the failure of the sample.(3)The experimental results of stress-strain curves were fitted using cubic polynomials and rational fractions to obtain the rising and falling sections of the stress-strain curves of lunar solidified soil.A segmented constitutive model for lunar solidified soil specimens was proposed,and the calculated results of the model were in good agreement with the experimental curves,providing a theoretical basis for the technical analysis of lunar soil engineering.

关 键 词：土力学 模拟月壤 无机固化剂 固化体试件 

分 类 号：TU43[建筑科学—岩土工程]