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工程科学与技术:2016,48(2):74-82
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高频振动贯入过程中灌注桩护壁套管土塞效应机理
(福州大学土木工程学院)
Mechanisms of Soil Plugging Effect Inside Sleeve of Cast in place Piles Driven by High Frequency Vibratory Hammers
(SchoolofCivil Eng.,FuzhouUniv.)
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投稿时间:2015-07-14    修订日期:2015-08-28
中文摘要: 为研究灌注桩护壁套管高频振动贯入过程中土塞效应机理,利用ABAQUS有限元软件建立护壁套管高频振动贯入全过程的有限元-无限元耦合模型,对土拱效应、土塞闭塞程度及土塞影响因素等进行分析。结果表明:护壁套管高频振动贯入过程中套管端部土塞形成土拱,导致内侧摩阻力显著增大,此段土塞承担了内侧摩阻力的主要部分;护壁套管高频振动贯入过程中剪切面土体在反复剪切作用下,土体强度和胶结力降低,导致土塞处于不完全闭塞程度,贯入阻力也比其他贯入方式的阻力要小;内侧摩阻力随振动频率增大而减小,当振动频率达到一定值之后,振动频率对内侧摩阻力的影响不明显。内侧摩阻力随套管外径增大而逐渐减小;砂土中内侧摩阻力相较于黏土大,且随密实度增大而减小;同时,对护壁套管高频振动贯入过程中土塞阻力分布规律进行分析,给出了相应的简化计算公式。
Abstract:In order to study the mechanisms of soil plugging effect inside sleeve of cast-in-place piles driven by vibratory hammers,finite element and infinite element coupling model were established by using the commercial code ABAQUS,to simulate the full penetration process of the sleeve driven by using high frequency vibratory hammers.The results indicated that the soil plug inside the sleeve forms soil arch during vibratory sleeve driving,which leads to the obvious increase of inner frictional resistance.The soil plug of this section withstands the major part of the inner frictional resistance.The soil strength and cohesive force decrease during vibratory sleeve driving, which is induced by cyclic shearing action in the shear interface.As a result,the soil plug inside sleeve is incompletely plugged mode and the penetration resistance is less than that of other installation methods.The inner frictional resistance decreases with the increase of vibration frequency and sleeve diameter.The inner frictional resistance of sand is larger than that of clay,and decreases with the increase of density.The distributions of soil plug resistance were also studied,and a simplified formula was obtained to calculate the soil plug resistance.
文章编号:201500691     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(41272299)
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肖勇杰,吕艳平,陈福全.高频振动贯入过程中灌注桩护壁套管土塞效应机理[J].工程科学与技术,2016,48(2):74-82.
XIAO Yongjie,LYU Yanping,CHEN Fuquan.Mechanisms of Soil Plugging Effect Inside Sleeve of Cast in place Piles Driven by High Frequency Vibratory Hammers[J].Advanced Engineering Sciences,2016,48(2):74-82.