CAJ | 학술논문

通过有限元软件 ABAQUS 建立高频液压振动打桩的三维模型，研究高频打桩对周围土层性质的影响。为了更好的贯入，在桩轴线处建立半径为1 mm 的管。采用 Coulomb 的本构接触摩擦模型，管土的切向摩擦设为光滑，桩土接触采用罚函数，法向均采用硬接触。打入桩和圆管采用离散刚体壳模拟，土体采用摩尔库伦本构模型，很好的实现不排水条件下高频液压振动沉桩整个过程的数值分析。贯入模拟过程表明桩尖周围土体的水平应力和竖向应力发生应力突变现象；静载力越小，激振力越大，影响越大；频率越大，贯入时间越长；土体越坚硬，影响越大；桩土摩擦系数越大，影响越大。
통과유한원연건 ABAQUS 건립고빈액압진동타장적삼유모형，연구고빈타장대주위토층성질적영향。위료경호적관입，재장축선처건립반경위1 mm 적관。채용 Coulomb 적본구접촉마찰모형，관토적절향마찰설위광활，장토접촉채용벌함수，법향균채용경접촉。타입장화원관채용리산강체각모의，토체채용마이고륜본구모형，흔호적실현불배수조건하고빈액압진동침장정개과정적수치분석。관입모의과정표명장첨주위토체적수평응력화수향응력발생응력돌변현상；정재력월소，격진력월대，영향월대；빈솔월대，관입시간월장；토체월견경，영향월대；장토마찰계수월대，영향월대。
Here ,the three-dimensional model of high-frequency hydraulic vibration pile driving is established by using fi -nite element software ABAQUS so as to study the the effects of the pile driving on the surrounding soils .A rigid tube with 1 .0 mm radius is modeled along the axis of the pile for better penetration .Based on constitutive contact law ,the Coulomb friction model is used throughout all analyses .There is a frictionless contact between the tube and soil on the tangential direction ,and the penalty function is used in pile-soil contact ,while the hard contact is used on the normal di-rection .Moreover ,the driven pile and tube are simulated with discrete rigid body ,and the soil is simulated with Mohr-Coulomb model .Then the numerical analysis for the full process of the pile driving under undrained condition is per -formed by using high frequency hydraulic hammers .The numerical simulation analysis of pile penetration process shows that there is a stress mutation occurred both in the horizontal stress and vertical stress of the soils around pile toe .The in-crease of the effect on soils is greater with the decrease of static forces and the increase of exciting forces .The larger the frequency is ,the longer time the penetration uses .Moreover ,the harder the soil is ,the larger effect on soils shows .The increase of the effect on soils is greater with the increase of the friction coefficients of soils .