CAJ | 학술논문

采用位移贯入法施加荷载,以修正剑桥模型作为土体本构关系模型,通过在桩-土界面设置接触面并采用自定义初始孔隙比分布的子程序VOIDRI实现初始孔隙比随深度的非线性分布,建立较为符合压入管桩压桩实际的有限元模型,对压入管桩压桩产生的挤土位移进行数值模拟研究,讨论压入管桩压桩产生的竖向和水平挤土位移沿深度方向和径向的分布规律.研究结果表明:随径向距离的增大,浅层土体的竖向挤土位移逐渐由沉降变为隆起,而深层土体的竖向挤土位移始终表现为沉降;随深度的增大,至桩中心距离较小处土体的竖向挤土位移始终表现为沉降,而至桩中心距离较大处土体的竖向挤土位移逐渐由隆起变为沉降;不同深度土体的水平挤土位移沿径向的分布规律和不同径向距离土体的水平挤土位移沿深度方向的分布规律都趋于一致.最后提出能够有效减小压入管桩挤土效应的施工措施.
채용위이관입법시가하재,이수정검교모형작위토체본구관계모형,통과재장-토계면설치접촉면병채용자정의초시공극비분포적자정서VOIDRI실현초시공극비수심도적비선성분포,건립교위부합압입관장압장실제적유한원모형,대압입관장압장산생적제토위이진행수치모의연구,토론압입관장압장산생적수향화수평제토위이연심도방향화경향적분포규률.연구결과표명:수경향거리적증대,천층토체적수향제토위이축점유침강변위륭기,이심층토체적수향제토위이시종표현위침강;수심도적증대,지장중심거리교소처토체적수향제토위이시종표현위침강,이지장중심거리교대처토체적수향제토위이축점유륭기변위침강;불동심도토체적수평제토위이연경향적분포규률화불동경향거리토체적수평제토위이연심도방향적분포규률도추우일치.최후제출능구유효감소압입관장제토효응적시공조시.
An appropriate finite element model(FEM)is given according to the actual piling process of press?in pipe piles, which adopts the displacement penetration method to load and the modified Cambridge model as the constitutive model of soil. Through setting pile?soil interface and adopting the subroutine VOIDRI which self?defines the initial void ratio distribution to achieve the non?linear distribution of initial void ratio with the depth,the FEM is used to numerically simulate the compacting dis?placement due to press?in pipe pile piling. The distribution rule of vertical or horizontal compacting displacement due to press?in pipe pile piling with the depth or radius is discussed. The results show that with the increase of radial distance,the vertical compact?ing displacement of shallow soil changes from settlement to upheaval gradually,while that of deep soil always shows the settlement. With the increase of depth,the vertical compacting displacement of soil nearby the pile always presents the settlement,while that of soil far away from the pile changes from upheaval to settlement continuously. Distribution rule of horizontal displacement with the ra?dial distances at different depths or with the depths at different radial distances tends to be same. Some construction measurements are put forward to decrease the compacting effect from press?in pipe pile piling.