激振荷载作用下桩基础动力响应的现场试验分析

曹小林; 周凤玺; 戴国亮; 龚维明

doi:10.11779/CJGE2023S10008

激振荷载作用下桩基础动力响应的现场试验分析 English Version

曹小林^{1, 2,},
周凤玺^{1, 2},
戴国亮³,
龚维明³

1.
兰州理工大学土木工程学院, 甘肃兰州 730050
2.
兰州理工大学西部土木工程防灾减灾教育部工程研究中心, 甘肃兰州 730050
3.
东南大学土工程学院, 江苏南京 211189

基金项目:

国家自然科学基金项目 12362032

国家自然科学基金项目 51978320

兰州理工大学红柳优秀人才支撑计划

详细信息

作者简介:
曹小林(1990—)，男，讲师，硕士生导师，主要从事岩土工程方面的教学与科研工作。E-mail: xlcao@lut.edu.cn

中图分类号: TU473
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- 文章访问数: 174
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- PDF下载量: 49
出版历程
- 收稿日期: 2023-07-06
- 网络出版日期: 2023-11-23
- 刊出日期: 2023-10-31

Field tests on dynamic response of pile foundation under excitating loads

1.
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
2.
Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China
3.
School of Civil Engineering, Southeast University, Nanjing 211189, China

摘要

摘要: 为了研究水平和竖向激振动力荷载作用下单桩和群桩的承载特性，设计了水平和竖向激振荷载下单桩、两桩、三桩和四桩在多层土中的动力试验方案。对现场试验数据采集得到了单桩、两桩、三桩和四桩的桩头位移，分析了桩头位移随着激振频率和桩数的变化规律。基于试验结果，给出了单桩、两桩、三桩和四桩的水平和竖向刚度，分析了桩头刚度随着桩数和激振频率的变化规律。并采用刚度得到了群桩动力效率系数，分析了动力效率系数随着群桩桩数和振动频率的变化规律。试验结果给出了位移、桩头刚度和群桩相互作用系数的变化规律，为简化理论计算方法和验证计算模型提供了宝贵的数据。
- 现场试验 /
- 桩基础 /
- 动力响应 /
- 激振荷载 /
- 群桩刚度
Abstract: To study the bearing characteristics of single pile and pile groups under horizontally and vertically excitating dynamic loads, a dynamic test plan is designed for single pile, two piles, three piles and four piles in multi-layer soil under horizontally and vertically excitating loads. The pile-head displacements of single pile, two piles, three piles and four piles are obtained from field test data, and the variation laws of the pile-head displacements with excitating frequency and pile number are analyzed. Based on the test results, the horizontal and vertical stiffnesses of single pile, two piles, three piles and four piles are given, and the variation of pile-head stiffness with the number of piles and excitating frequency is analyzed. The dynamic efficiency coefficient of the pile group is obtained through the stiffness, and its variation laws with the number of piles in the pile group and vibration frequency are analyzed. The test results may provide valuable data for simplifying the theoretical methods and verifying the relevant models through changes in displacement, pile-head stiffness and interaction coefficient of pile groups.
- field test /
- pile foundation /
- dynamic response /
- excitating load /
- group pile stiffness

HTML全文

图 1 加载系统实物图

Figure 1. Diagram of loading system

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图 2 桩的布置及现场加载实物图

Figure 2. Layout of piles and on-site loading

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图 3 水平位移幅值曲线

Figure 3. Curves of horizontal displacement amplitude

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图 4 竖向位移幅值曲线

Figure 4. Curves of vertical displacement amplitude

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图 5 单桩和群桩的水平刚度随着频率的变化规律

Figure 5. Variation of horizontal stiffness of single pile and pile groups with vibration frequency

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图 6 单桩和群桩竖向刚度随着频率的变化规律

Figure 6. Variation of vertical stiffness of single pile and pile groups with vibration frequency

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图 7 水平群桩动力效率系数随着频率的变化规律

Figure 7. Variation of horizontal dynamic efficiency coefficient of pile groups with vibration frequency

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图 8 竖向群桩动力效率系数随着频率的变化规律

Figure 8. Variation of vertical dynamic efficiency coefficient of pile groups with vibration frequency

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表 1 土层力学参数

Table 1 Mechanical parameters of soil layers

层号	含水率w/%	相对质量密度G_s	重度γ /(kN·m^-3)	干重度γ_d/(kN·m^-3)	孔隙比e	塑性指数I_P	液性指数I_L
2-2	42.3	2.73	17.4	12.2	1.20	15.2	1.21
2-3	26.2	2.69	18.5	14.7	1.00	8.0	0.78

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