开口管桩高频振动贯入过程的ALE有限元分析.pdfVIP

Journal of Engineering Geology 工程地质学报 1004- 9665/ 2016/ 24 ( 3 ) - 0398-11 DOI ： 10.13544/j .cnki jeg. .2016.03.009 开口管桩高频振动贯入过程的A L E 有限元分析 肖勇杰陈福全林良庆 ( 福州大学土木工程学院福州 350116) 摘 要 任 意 拉 格 朗 日 - 欧拉（A LE) 方法吸取了拉格朗日和欧拉法的优点，避免了常规有限元中拉格朗日方法的网格畸变问 题，适用于开口管桩高频振动贯人过程的计算分析。采用A LE 有限元方法，建立开口管桩高频振动贯人过程的数值模型，对 沉桩过程中挤土效应、桩侧阻力和土塞效应的变化规律进行了详细研究。研究结果表明：挤土应力主要沿径向传播,且深层 土体受到的挤土应力比浅层土体大；水平挤土位移随管桩贯人深度的增加而增大,而最大水平挤土位移与管桩贯人深度存在 累积效应；挤土效应的影响范围约为1 0倍管径，因此在施工过程中要给以足够重视；桩外侧摩阻力随贯人深度增加呈近似 线性增长，桩内侧摩阻力随贯人深度增加而呈非线性增长，增长速率随贯人深度增加而逐渐增大；管内土塞处于不完全闭塞 状态，土塞程度由完全非闭塞向部分闭塞过渡。此外，研究了土体模量、桩土界面摩擦系数、振动频率和桩径对土体位移的影 响。 关 键 词 开 口 管 桩 高 频 振 动 A L E 方 法 有 限 元 中图分类号:TU473. 1 文献标识码:A ALE FINITE ELEMENT ANALYSIS ON PENETRATION PROCESS OF OPEN-ENDED PIPE PILES DRIVEN WITH HIGH FREQUENCY HAMMERS XIAO Yongjie CHEN Fuquan LINLiangqing ( School o f Civil Enyineeriny o f Fuzhoo University, Fuzhoo 35011/) Abstract Arbitrary Lagrangian-Eulerian ( ALE ) methods couple the advantages of Lagrangian and Eulerian methods , and avoid the mesh distortion problem of Lagrangian method of geeera finite elemeet . The methods can effectively analyze the penetration process of open-ended pipe piles driven by high ALE finite element methods , the finite element mode of fu penetration process of open-ended pipe piles driven by high frequency vibratory hammers is built . The paper studies in detai squeezing effect , frictiona resistance and soil plugging effect during pile -sinking . The computationa results show that the compacting stress mainly spreads along the horizonta direction , and the compacting stress in deep soi layers is larger than compacting stress in sha ow soil layers . The horizonta compacting displacements increase with the increase of penetration depth . But the maximum compacting displacement delays penetration depth . The affecting range of squeezing effect i