吉林大学学报（地球科学版）
吉林大學學報（地毬科學版）
길림대학학보（지구과학판）
JOURNAL OF JILIN UNIVERSITY(EARTH SCIENCE EDITION)
2014年
3期
918-924
,共7页
年廷凯%余鹏程%柳楚楠%陆淼嘉%刁美慧
年廷凱%餘鵬程%柳楚楠%陸淼嘉%刁美慧
년정개%여붕정%류초남%륙묘가%조미혜
吹填粉砂土%蠕变行为%模型参数%幂函数%Burgers体模型
吹填粉砂土%蠕變行為%模型參數%冪函數%Burgers體模型
취전분사토%연변행위%모형삼수%멱함수%Burgers체모형
dredger fill silty sand%creep behavior%model parameters%power function%Burgers model
通过分析法向应力、干密度、土样尺寸对吹填粉砂土蠕变特性的影响，深入研究其固结蠕变特性。与Kelvin模型相比，采用Burgers体模型能够更合理地阐释吹填粉砂土的蠕变曲线；采用 FLAC3D方法可开展吹填土蠕变过程的三维数值模拟。结果表明：吹填粉砂具有一定的蠕变特性，并可用幂函数描述应力应变、应变时间的关系；干密度一定时，法向应力愈大，初始应变愈大，达到稳定的时间愈长；法向应力一定时，干密度越大，初始变形越小，最终稳定所需时间越短；大尺寸试样（Ф200．0 mm× H 200．0 mm）的瞬时变形与蠕变形率要比标准尺寸（Φ61．8 mm×H 20．0 mm）大，稳定所需时间要长；此外，Burgers体模型模拟吹填粉砂土固结蠕变变形优于广义Kelvin模型并具有可行性。
通過分析法嚮應力、榦密度、土樣呎吋對吹填粉砂土蠕變特性的影響，深入研究其固結蠕變特性。與Kelvin模型相比，採用Burgers體模型能夠更閤理地闡釋吹填粉砂土的蠕變麯線；採用 FLAC3D方法可開展吹填土蠕變過程的三維數值模擬。結果錶明：吹填粉砂具有一定的蠕變特性，併可用冪函數描述應力應變、應變時間的關繫；榦密度一定時，法嚮應力愈大，初始應變愈大，達到穩定的時間愈長；法嚮應力一定時，榦密度越大，初始變形越小，最終穩定所需時間越短；大呎吋試樣（Ф200．0 mm× H 200．0 mm）的瞬時變形與蠕變形率要比標準呎吋（Φ61．8 mm×H 20．0 mm）大，穩定所需時間要長；此外，Burgers體模型模擬吹填粉砂土固結蠕變變形優于廣義Kelvin模型併具有可行性。
통과분석법향응력、간밀도、토양척촌대취전분사토연변특성적영향，심입연구기고결연변특성。여Kelvin모형상비，채용Burgers체모형능구경합리지천석취전분사토적연변곡선；채용 FLAC3D방법가개전취전토연변과정적삼유수치모의。결과표명：취전분사구유일정적연변특성，병가용멱함수묘술응력응변、응변시간적관계；간밀도일정시，법향응력유대，초시응변유대，체도은정적시간유장；법향응력일정시，간밀도월대，초시변형월소，최종은정소수시간월단；대척촌시양（Ф200．0 mm× H 200．0 mm）적순시변형여연변형솔요비표준척촌（Φ61．8 mm×H 20．0 mm）대，은정소수시간요장；차외，Burgers체모형모의취전분사토고결연변변형우우엄의Kelvin모형병구유가행성。
The authors research the consolidation creep characteristics of dredger fill silty sand by analyzing the effect of normal stress,dry density and sample size on its creep behavior.In comparison to the Kelvin’s model,the Burgers’s model is more reasonable to interpret the creep curve of dredger fill silty sand,so the FlCD3D method is utilized to carry out the three-dimensional numerical simulation of its consolidation creep process.The results show that dredger fill silty sand exhibits certain creep behavior and the power functions can be used to describe the stress-strain relationship and strain-time relationship .For the given dry density,the larger the normal stress is,the larger the initial strain is and the longer time it takes to stabilize.When normal stress is constant,the larger the dry density is,the smaller the initial deformation is and the shorter time it needs to stabilize eventually.The instantaneous deformation and creep rate of large size sample (Ф200.0 mm × H200.0 mm)is larger than that of standard size sample (Φ61.8 mm×H20.0 mm)and the time needed for larger size sample to stabilize is longer.In addition,the Burgers’s model proved to be superior to Kelvin’s model is feasible to simulate the consolidation creep process of dredger fill silty sand.The achievements of this research can provide helpful reference for simulations of creep test and engineering practices related to dredger fill silty sand in coastal area.
