摘要:
为探讨含水率对非饱和黏土动态压缩特性的影响规律,利用分离式霍普金森压杆(SHPB)实验装
置,针对不同含水率非饱和黏土试样开展了侧限条件下的动态压缩实验。实验结果表明,在径向变形受到约
束时,当黏土中含有少量水时,比干黏土更容易压缩;而当含水率进一步增加时,试样在受压过程中逐渐接近
饱和状态,黏土的抗压性能则明显提升。从能量吸收与分配角度来看,随着含水率的增加,试样所吸收的总能
量在逐渐下降,体积改变能所占的比例逐渐增大,而形状改变能所占比例则逐渐减小。
Abstract:
Abstract:Dynamiccompressionexperimentswereperformedwithamodifiedsplit-Hopkinsonpressurebartoexploretheeffectsofmoisturecontentonthedynamiccompressionpropertiesofunsaturatedclayundertheconstantstr
in-rateloading.Theexperimentalresultsindicatethatwhenthewatercontentislow,
thewateraddedintheclay,theradialformationofwhichisconfined,actsaslubricantandcanreducethefrictionbetweentheclayparticlessothattheunsaturatedlayiscompressed
moreeasilythanthedryclay.Butwiththeincreasingofthewatercontent,thevoidsaregradually
displacedbywater,makingitdifficultforclayparticlestodisplacetheinterstitialgaps,consequently,
theclaymarkedlybecomesgoodinanti-compressionproperties.Andasthewatercontentincreases,
thetotalenergyabsorbedbytheclaydecreases,inwhichtheportionofthevolumetricdeformation
energyincreasesandtheportionofthedeviatoricdeformationenergydescends.
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