随着全套管振动取土灌注桩施工工艺的发展,灌注桩在工程中的应用越来越广泛,但关于灌注桩套管振动贯入机制,特别是套管贯入引起的地面振动研究还不全面。在全面介绍了套管振动贯入全过程的有限元-无限元耦合模型的建立过程后,对套管振动贯入引起的地面振动规律及施工安全距离进行了详细研究。采用正交试验与数值模拟相结合的正交有限元法评价了各因素对施工安全距离的影响程度。研究结果表明:套管贯入过程中,地面振动主要沿水平向;在套管贯入初期,地面不会产生水平向峰值速度,当套管贯入到振动临界深度时,地面产生水平向峰值速度;地面水平向峰值速度随径向距离增大呈指数型衰减;施工安全距离随动力荷载幅值、接触面摩擦系数增大而增大,随振动频率、土体模量增大而减小。研究了隔振沟的填充材料、深度和宽度对隔振效果的影响,结果表明,无填充料的隔振沟隔振效果最好;隔振沟的宽度对隔振效果影响不大,其深度对隔振效果影响显著。 With the development of the full-pipe vibro-earth-filling process, the application of cast-in-place piles is more and more widely. However, the research on the mechanism of penetration of cast-in-place bores, especially the ground vibrations caused by casing penetration comprehensive. After a comprehensive introduction of the process of casing vibration penetration into the finite element coupled with finite element method, the ground vibration law and construction safety distance caused by casing penetration are studied in detail. Orthogonal experiment and numerical simulation were used to evaluate the influence of various factors on the construction safety distance. The results show that the vibration of the ground is mainly along the horizontal direction during the casing penetration. At the initial penetration of the casing, the ground does not produce horizontal peak velocity. When the casing penetrates to the critical depth of vibration, the ground produces horizontal peak Speed. The horizontal peak-to-peak velocity decreases exponentially with the increase of radial distance. The construction safety distance increases with the dynamic load amplitude and the friction coefficient at the contact surface, and decreases with the vibration frequency and soil modulus . The results show that the isolation vibration isolation groove with no filler has the best vibration isolation effect; the width of vibration isolation groove has little effect on the vibration isolation effect, and the depth Vibration isolation effect is significant.