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

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (1) : 252-264.

SHI Gang, GAO Xinjun, ZHANG Hao

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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.

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Saturated soil / SDMC pile / Active wave barriers / Screening efficiency / Semi-analytical BEM-FEM

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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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