CAJ | 학술논문

首先,基于前人的室内试验数据和随机散粒体不连续变形(SGDD)模型数值试验成果分析尺寸效应对堆石体瞬时变形的影响,结果表明:不考虑堆石体蠕变效应时,在相同的应力状态下,大尺寸试样的抗剪强度及抗变形能力均较小尺寸试样有所提高,表现出更"硬"的特点;其次,分别在尺寸为(50 cm×100 cm(颗粒最大粒径为10 cm)和(30 cm×60 cm(颗粒最大粒径为6 cm)的应力式三轴仪上进行堆石体蠕变试验,研究堆石体蠕变的尺寸效应,结果表明,尺寸效应对堆石体蠕变特性的影响显著,大尺寸试样的最终蠕变量明显大于小尺寸试样,而尺寸效应对蠕变速率因子λ的影响并无明显规律;最后,综合分析尺寸效应对堆石体总变形(瞬时变形+蠕变变形)的影响,从总体上看,大尺寸试样的总变形大于小尺寸试样.
수선,기우전인적실내시험수거화수궤산립체불련속변형(SGDD)모형수치시험성과분석척촌효응대퇴석체순시변형적영향,결과표명:불고필퇴석체연변효응시,재상동적응력상태하,대척촌시양적항전강도급항변형능력균교소척촌시양유소제고,표현출경"경"적특점;기차,분별재척촌위(50 cm×100 cm(과립최대립경위10 cm)화(30 cm×60 cm(과립최대립경위6 cm)적응력식삼축의상진행퇴석체연변시험,연구퇴석체연변적척촌효응,결과표명,척촌효응대퇴석체연변특성적영향현저,대척촌시양적최종연변량명현대우소척촌시양,이척촌효응대연변속솔인자λ적영향병무명현규률;최후,종합분석척촌효응대퇴석체총변형(순시변형+연변변형)적영향,종총체상간,대척촌시양적총변형대우소척촌시양.
Firstly,scale effect on instantaneous deformation of rockfill is studied by experimental data in former studies and numerical tests base on stochastic granule discontinuous deformation(SGDD) model. It is demonstrated that larger specimen shows higher shear strength and initial modulus of elasticity under the same axial stress and confining pressure without considering creep deformation of rockfill. Secondly,two kinds of specimens with different sizes((50 cm×100 cm(maximum grain diameter is 10 cm) and (30 cm×60 cm(maximum grain diameter is 6 cm)) are subjected to stress control triaxial creep tests,which aim to study the scale effects on creep deformation of rockfill. It reveals that scale effect has significant influence on creep property of rockfill. Larger specimens give more creep deformation,but no clear law is found about the scale effect on the factor of creep rate . Finally,based on the synthetical analysis of scale effect on total deformation including instantaneous and creep deformations of rockfill,the total deformation of big specimen is larger than that of the small one as a whole.