Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (3): 88-97.doi: 10.6040/j.issn.1672-3961.0.2019.246

• Civil Engineering • Previous Articles     Next Articles

Field test and analysis of vibration isolation of machine foundation by a row of holes in saturated soil

Lianyong SUN1(),Gang SHI2,*(),Xinzhuang CUI3,Mingxiang ZHOU4,Yongjun WANG1,Fang JI1,Xiaodong YAN1   

  1. 1. Jinan Rail Transit Group Co., Ltd., Jinan 250101, Shandong, China
    2. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China
    3. School of Civil Engineering, Shandong University, Jinan 250061, Shandong, China
    4. Metro Engineering Co., China Railway 16th Bureau Group, Ltd., Beijing 100020, China
  • Received:2019-05-24 Online:2020-06-01 Published:2020-06-16
  • Contact: Gang SHI E-mail:635293650@qq.com;13526584056@163.com
  • Supported by:
    国家自然科学基金资助项目(51508520);国家自然科学基金资助项目(1308506)

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Abstract:

The investigation was focused on the effects of using a row of holes for the reduction of nearby vibration response generated by the motion of a machine foundation on saturated soil. The analysis was accomplished with the aid of a series of field experiments and numerical simulation. 3D semi-analytical BE models were established to use a row of holes 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 screening effectiveness were investigated and discussed in detail. The results showed that a row of holes could isolate the ground vibrations successfully. Increasing the radius and the depth, decreasing the net spacing between two successive holes increase the screening effectiveness. According to the results, it was suggested in the design that the hole radius should take the value of 0.1-0.15λR, and the hole depth and the net spacing between two successive holes should take the value no more than 1.0λR and 0.1λR, respectively. Moreover, the distance between the machine foundation and wave barriers affect the screening effectiveness, and the the distance was, the the screening effectiveness was. The number of holes in a row had less effect on the screening effectiveness. However, the bigger the number of holes in a row was, the larger the screening zone behind barriers was.

Key words: machine foundation, ground vibrations, a row of holes, saturated soil, in-situ test, semi-analytical BEM, screening efficiency

CLC Number: 

  • TU435

Fig.1

Vibration-exciting system and signal collection system"

Table 1

Test parameters of vibration isolation by a row of holes"

几何参数 实际尺寸/m 无量纲尺寸振动频率/Hz
150 100 50
孔半径R 0.148 r* 0.150 0.100 0.050
孔深H 1.200 h* 1.200 0.810 0.405
孔间净距L 0.222 l* 0.220 0.150 0.075
距振源距Sd 1.480 Sd* 1.500 1.000 0.500

Fig.2

The arrangement plan of ground measure points"

Fig.3

Graphs of ARF for a row of holes along x-axis"

Fig.4

The machine foundation and solution meshes"

Fig.5

Comparison of calculation results with field-test results"

Table 2

Mechanical parameters of saturated soil"

μ/MPa κ/(m4·N-1) ρs/(kg·m-3) υ α R/MPa ρa/(kg·m-3) ρf/(kg·m-3) φ
73 150 1 000 0.39 0.97 73 150 2 800 0.39

Fig.6

The barrier vibration isolation effectiveness of a row of holes under base condition"

Fig.7

Contour of ARF of a row of holes for different N"

Fig.8

Effect of N on the average amplitude attenuation coefficient AR"

Fig.9

Contour of ARF of a row of holes for different l*"

Fig.10

Effect of l* on average amplitude attenuation coefficient AR"

Fig.11

Contour of ARF of a row of holes for different r*"

Fig.12

Effect of r* on average amplitude attenuationcoefficient AR"

Fig.13

Contour of ARF of a row of holes for different h*"

Fig.14

Effect of h* on average amplitude attenuation coefficient AR"

Fig.15

Contour of ARF of a row of holes for different Sd*"

Fig.16

Effect of Sd* on average amplitude attenuationcoefficient AR"

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