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山东大学学报 (工学版) ›› 2020, Vol. 50 ›› Issue (3): 88-97.doi: 10.6040/j.issn.1672-3961.0.2019.246

• 土木工程 • 上一篇    下一篇

饱和地基中单排孔近场隔振的现场试验与数值分析

孙连勇1(),时刚2,*(),崔新壮3,周明祥4,王永军1,纪方1,闫小东1   

  1. 1. 济南轨道交通集团有限公司，山东 济南 250101
    2. 郑州大学土木工程学院，河南 郑州 450001
    3. 山东大学土建与水利学院，山东 济南 250061
    4. 中铁十六局集团地铁工程有限公司, 北京 100020
  • 收稿日期:2019-05-24 出版日期:2020-06-01 发布日期:2020-06-16
  • 通讯作者: 时刚 E-mail:635293650@qq.com;13526584056@163.com
  • 作者简介:孙连勇(1974—)，男，山东寿光人，硕士，高级工程师，主要研究方向为城市轨道交通与地下工程. E-mail：635293650@qq.com
  • 基金资助:
    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)

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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摘要：

针对饱和地基中明置动力机器基础的环境振动影响问题，进行单排孔近场隔振的现场试验和三维边界元数值分析。对现场试验结果进行无量纲化分析；基于饱和土三维半解析边界元法，分别推导动力机器基础环境振动影响和单排孔近场隔振的边界元方程；详细研究单排孔对动力机器基础振动影响的隔振效果，分析单排孔几何参数和单排孔距振源距离对隔振效果的影响。结果表明：单排孔能够降低动力机器基础的环境振动影响；增加排孔孔径和孔深、降低孔间净距均能取得更好的隔振效果，工程设计时，建议排孔孔径取0.1~0.15λR(Rayleigh波波长)、孔深不超过1.0λR，孔间净距不大于0.1λR；单排孔距振源距离对其隔振效果也有较大影响，距离越近则隔振效果越好。单排孔孔数对其平均隔振效果影响很小，但更多的排孔可获得更大的屏蔽区域面积。

关键词: 动力机器基础, 环境振动, 单排孔, 饱和地基, 现场试验, 半解析边界元法, 隔振效果

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

中图分类号: 

  • TU435

图1

激振系统与信号采集系统"

表1

单排孔隔振试验参数"

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

图2

单排孔近场隔振试验的地面测点布置图"

图3

振幅衰减系数ARF随距屏障中心距离的变化曲线"

图4

饱和地基上的动力机器基础及边界单元划分"

图5

计算结果与现场试验结果的对比"

表2

饱和土地基的材料参数"

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

图6

基准条件下单排孔对刚性基础振动的隔振效果"

图7

单排孔孔数N不同的ARF等值线图"

图8

单排孔孔数N对平均振幅衰减系数AR的影响"

图9

桩间净距l*不同时单排孔隔振ARF的等值线图"

图10

单排孔桩间净距对平均振幅衰减系数AR的影响"

图11

单排孔孔径r*不同时ARF的等值线图"

图12

单排孔孔径r*对平均振幅衰减系数AR的影响"

图13

单排孔孔深h*不同时ARF的等值线图"

图14

单排孔孔深h*对平均振幅衰减系数AR的影响"

图15

单排孔距基础距离Sd*不同时ARF的等值线图"

图16

单排孔距基础距离Sd*对平均振幅衰减系数AR影响"

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