饱和地基水泥土复合桩近场主动隔振的BEM-FEM耦合分析

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (1) : 252-264.

论文

时刚，郜新军，张浩

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BEM-FEM coupled analysis of near-field active vibration isolation of SDCM piles on saturated foundation

SHI Gang, GAO Xinjun, ZHANG Hao

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摘要

人工振动污染是当前城市发展过程中面临的一个难题，单排或多排桩是人工振动污染防治的一种重要方式。传统基桩施工容易造成泥浆污染、振动等各种负面环境问题，而水泥土复合桩是一种低振动、低噪声、无挤土、少排泥浆的新型基桩，特别适合在城区构建排桩屏障。针对饱和地基中单排水泥土复合桩的近场主动隔振问题，首先建立了动力机器基础环境振动影响的半解析BEM方程；在此基础上，分别采用半解析BEM对饱和地基、FEM对水泥土复合桩进行建模，根据饱和地基-水泥土桩接触面的平衡和相容条件，建立了水泥土复合桩近场主动隔振的半解析BEM-FEM耦合方程，给出了耦合方程稀疏矩阵的存储策略，并对单排水泥土复合桩的近场主动隔振效果进行了计算分析。研究结果表明：单排水泥土复合桩能够有效的对动力机器基础引起环境振动进行隔振；等长芯桩复合桩的隔振效果要优于短芯桩。单排水泥土复合桩的隔振效果随着桩数的增加而逐渐提高；较小桩间距并不一定取得更好的隔振效果，建议相邻桩桩间净距取2~2.5λ_R（Rayleigh波波长）。随着单排水泥土复合桩距振源距离的增加，屏障隔振效果逐渐降低，但降低幅度相对较小。此外，对水泥土复合桩而言，当内插预制桩的外轮廓尺寸相同时，预制芯桩型式对水泥土复合桩隔振效果影响相对较小，可根据实际工程条件选择合适的芯桩类型。

Abstract

Traffic, machine operations can generate ground vibrations, which can cause distress to adjacent structures, and disturb the operation of precision instrument. The adverse effects of ground vibrations can be eliminated or prevented by installation of various types of wave barriers, such as a row or multi-row of piles. However, construction of traditional piles can also generate adverse effects, such as mud, ground vibration or compacting effect. A new kind of environmental-friendly pile, called stiffed deep cement mixing (SDCM), is introduced to construct wave barriers in city. In order to investigate the screening efficiency of a row of SDCM piles in saturated soil, a 3D semi-analytical BEM-FEM coupling model is established to use a row of SDCM piles as active wave barrier, to isolate the ground vibrations generated by the machine foundation laid on the surface of saturated soil foundation. And the effects of the model parameters on isolation effectiveness are investigated and discussed in detail. The results show that a row of SDCM piles can isolate the ground vibrations successfully. The SDCM pile row with isometric core pile has a better screening efficiency than that of short core pile, and increasing the number of piles in a row can get a better vibration isolation effectiveness. Further, the net spacing between two successive piles has less effect on the screening efficiency. According to the results, it’s suggested in the design that the hole radius should take the value of 2~2.5λ_R (λ_R is the Rayleigh wave length) . The distance between the machine foundation and barrier can affect the screening effectiveness, and the larger the distance is, the poor the screening effectiveness is. Moreover, the SDCM pile wave barriers, which are made up of different precast core piles with the same overall dimension, can result the approximate equivalent screening efficiency.

导出引用

时刚，郜新军，张浩. 饱和地基水泥土复合桩近场主动隔振的BEM-FEM耦合分析[J]. 振动与冲击, 2024, 43(1): 252-264

SHI Gang, GAO Xinjun, ZHANG Hao. BEM-FEM coupled analysis of near-field active vibration isolation of SDCM piles on saturated foundation[J]. Journal of Vibration and Shock, 2024, 43(1): 252-264

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