基于离散单元法碎石垫层隔震性能的宏细观分析

张昕; 戴国亮; 栾阳; 张倩; 贾其军

doi:10.11899/zzfy20230316

基于离散单元法碎石垫层隔震性能的宏细观分析

doi: 10.11899/zzfy20230316

张昕^1,,
戴国亮^{2, 3},
栾阳^{2, 3},
张倩^{2, 3},
贾其军^1, ,

1.
中国路桥工程有限责任公司, 北京 100011
2.
东南大学，土木工程学院, 南京 210096
3.
东南大学，混凝土及预应力混凝土结构教育重点实验室, 南京 210096

基金项目: 中交集团重点科研课题（2016-zjjt-24）

详细信息

作者简介:
张昕，男，生于1975年。高级工程师。主要从事工程项目管理及岩土工程抗震方面研究工作。E-mail：zhangx@crbc.com

通讯作者:
贾其军，男，生于1976年。博士，高级工程师。主要从事岩土工程研究工作。E-mail：18513671198@163.com

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出版历程
- 收稿日期: 2022-03-24
- 刊出日期: 2023-08-31

Macro and Micro Analysis of Seismic Isolation Performance of Gravel Cushion Based on Discrete Element Method

Zhang Xin^1
,,
Dai Guoliang^{2, 3},
Luan Yang^{2, 3},
Zhang Qian^{2, 3},
Jia Qijun^{1
, ,}

1.
China Road and Bridge Corporation, Beijing 100011, China
2.
School of Civil Engineering, Southeast University, Nanjing 210096, China
3.
Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education, Southeast University, Nanjing 210096, China

摘要

摘要: 为研究非接触桩箱复合基础中碎石垫层隔震性能，采用颗粒流软件PFC^3D对碎石垫层和沉箱进行模拟分析，从宏细观多角度对碎石垫层隔震性能进行分析。研究结果表明，竖向压力、垫层厚度对垫层隔震效果的影响较大；地震动加载过程中，垫层底部颗粒水平相对位移较大，垫层中上部颗粒水平相对位移较小，颗粒配位数及垫层孔隙率与碎石垫层隔震效果关系密切。
- 碎石垫层 /
- 基础 /
- 隔震 /
- 减震率 /
- 颗粒 /
- 离散元
Abstract: In order to study the seismic behavior of gravel cushion set up in the unconnected piles-caisson foundation, particle flow analysis software PFC^3D was used to numerically simulate the shake table tests of gravel cushion and caisson and to study the seismic isolation performance of the gravel cushion from macro and micro view. The results shows that vertical pressure and thickness of the cushion have significant influence on isolation effect of the gravel cushion. During ground shaking loading, the horizontal relative displacement of particles at the bottom of the cushion is large, and the horizontal relative displacement of particles at the middle and upper part of the cushion is small. The changes of particle coordination number and cushion porosity are closely related to the seismic isolation effect of gravel cushion.
- Gravel cushion /
- Foundation /
- Seismic isolation /
- Vibration reduction ratio /
- Particle /
- Discrete element method

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图 1 非接触桩箱复合基础组成示意

Figure 1. Non-contact pile box composite foundation

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图 2 垫层数值模型

Figure 2. Numerical simulation model of bedding layer

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图 3 输入地震动加速度时程曲线

Figure 3. Input seismic recording acceleration timehistory curves

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图 4 非接触桩箱复合基础水平承载力变化曲线

Figure 4. Horizontal bearing capacity change curves of non-contact pile box composite foundation

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图 5 非接触桩箱复合基础水平荷载-位移关系曲线

Figure 5. Horizontal load-displacement relationship curves of non-contact pile box composite foundation

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图 6 不同时刻垫层内颗粒平均位移

Figure 6. Average displacement of particles of bedding layer under different moments

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图 7 不同时刻垫层内颗粒平均加速度

Figure 7. Average acceleration of particles of bedding layer under different moments

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图 8 不同时刻垫层内颗粒平均位移

Figure 8. Average particle displacement of bedding layer under different moments

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图 9 不同时刻垫层内颗粒平均加速度

Figure 9. Average acceleration of particles of bedding layer under different moments

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图 10 不同时刻垫层内颗粒平均位移

Figure 10. Average particle displacement of particles of bedding layer under different moments

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图 11 不同时刻垫层内颗粒平均加速度

Figure 11. Average acceleration of particles of bedding layer under different moments

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图 12 垫层平均孔隙率随时间变化曲线

Figure 12. Average porosity curves of bedding layer

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图 13 垫层平均配位数随时间变化曲线

Figure 13. Average matting coordination number of bedding layer

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图 14 输入地震动加速度时程曲线

Figure 14. Input acceleration timehistory curve

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图 15 垫层不同高度处平均孔隙率随时间变化曲线

Figure 15. Mean porosity curves at different heights of bedding layer

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图 16 垫层不同高度处颗粒平均配位数随时间变化曲线

Figure 16. Curve of mean particle coordination number at different heights of bedding layer

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表 1 垫层材料参数

Table 1. Bedding material parameters

参数	数值
粒径/mm	5.2，3.1～7.0，0.1～9.9
厚度/mm	20.0，30.0，40.0，60.0
阻尼比	0.055
黏聚力/kPa	0
重度/（kN·m⁻³）	16.51
颗粒间摩擦系数	0.57
侧限压缩模量/MPa	60.1

下载: 导出CSV

表 2 隔震率对比

Table 2. Comparison of isolation ratio

方案编号	垫层厚度/mm	压力/kPa	输入加速度/（m·s⁻²）	输出加速度/（m·s⁻²）	数值模拟减震率/%	文献减震率/%	误差/%
1-1	200	3.5	3.44	1.70	50.6	57.1	11.4
1-2	200	8.3	3.40	2.35	30.9	32.1	3.8
1-3	300	3.5	3.41	1.52	55.4	36.84	33.5
1-4	300	8.3	3.41	1.78	47.8	44.11	7.7

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