桩式地震表面波屏障减震试验与数值分析

郁雯; 潘乐鹏; 张文祥; 魏宝川

doi:10.11899/zzfy20230117

桩式地震表面波屏障减震试验与数值分析

doi: 10.11899/zzfy20230117

郁雯^{1, 2,},
潘乐鹏^{1, 2},
张文祥^{1, 2},
魏宝川^{1, 2}

1.
河北建筑工程学院, 河北张家口075000
2.
河北省土木工程诊断、改造与抗灾重点实验室, 河北张家口075000

基金项目: 河北省高等学校科学技术研究项目资助（ZC2023028）；河北省高等学校科学技术研究青年基金项目（QN2021218）；河北建筑工程学院创新基金（XY202210）；张家口市2022年市级科技计划自筹经费项目（2221007A）

详细信息

作者简介:
郁雯，女，生于1981年。硕士，副教授。研究方向工程结构健康监测。E-mail：yuwen810224@163.com

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- 文章访问数: 86
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出版历程
- 收稿日期: 2022-06-07
- 刊出日期: 2023-03-31

Experimental Study and Numerical Analysis of Shock Absorption of Pile-type Seismic Surface Wave Barrier

Yu Wen^{1, 2
,},
Pan Lepeng^{1, 2},
Zhang Wenxiang^{1, 2},
Wei Baochuan^{1, 2}

1.
Hebei University of Architecture, Zhangjiakou 075000, Hebei, China
2.
Hebei Key Laboratory of Diagnosis, Reconstruction and Anti-disaster of Civil Engineering, Zhangjiakou 075000, Hebei, China

摘要

摘要: 在双层均质土地基条件下，以桩长和桩间距为参数，采用模型试验法和数值分析法研究屏障桩对地震表面波的减震效果。研究结果表明，设置屏障桩可有效减弱地震表面波在土体中的传播，使桩后方减震区域加速度响应明显减弱；屏障桩长度和间距均对地震表面波在土体中的传播影响显著；在桩长试验中，减震率变化同时受桩长和地基土层影响，实际工程中应根据地基中土层分布情况进行桩长设计；在桩间距试验中，减震区域减震率达46%～56%，桩间距宜取约1.5倍桩径。
- 地震表面波 /
- 屏障桩 /
- 模型试验 /
- 数值分析 /
- 减震率
Abstract: In order to study the shock absorption performance of barrier piles for seismic surface waves, this paper adopts two methods: model test and numerical analysis. Under the condition of double-layer homogeneous soil foundation, the two parameters of pile length and pile spacing are taken as variables, and the time domain analysis method is adopted to carry out the vibration test. The dynamic response of the test data in the shock absorption area is analyzed by the index of shock absorption rate. The results show that the barrier pile can effectively weaken the propagation of seismic surface waves in the soil, and the acceleration response in the damping area behind the pile is obviously weakened. The length and spacing of piles have a significant influence on the propagation of surface seismic waves in soil. In the pile length test, the change of damping rate is affected by both the pile length and the foundation soil layer. In practical engineering, the design of pile length should be determined according to the distribution of soil layer in the foundation. In the pile spacing test, the maximum damping rate in the damping area is 46%-56%, and the width of pile spacing should be about 1.5 times of pile diameter.
- Seismic surface wave /
- Pile /
- Model test /
- Numerical analysis /
- Damping rate

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图 1 试验设备

Figure 1. Test equipment diagram

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图 2 试验场地

Figure 2. Map of proving ground

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图 3 场地布置

Figure 3. Site layout

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图 4 El Centro波加速度时程曲线

Figure 4. El Centro wave acceleration time history curve

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图 5 模型试验得到的不同桩长下减震率变化曲线

Figure 5. Variation curves of damping ratio under different pile lengths obtained from model test

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图 6 模型试验得到的不同桩间距下减震率变化曲线

Figure 6. Variation curves of damping ratio under different pile spacing obtained from model test

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图 7 有限元整体模型

Figure 7. Finite element overall model

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图 8 截面示意图

Figure 8. Schematic diagram of cross section

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图 9 峰值加速度云图

Figure 9. Cloud map of peak acceleration

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图 10 数值分析得到的不同桩长下减震率变化曲线

Figure 10. Curve of damping ratio under different pile lengths obtained by numerical analysis

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图 11 数值分析得到的不同桩间距下减震率变化曲线

Figure 11. Curve of damping ratio under different pile spacing obtained by numerical analysis

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表 1 试验变量

Table 1. Test variables

桩长/m	桩间距/m	桩径/m
0.2	0.10	0.1
0.3	0.15	0.1
0.4	0.20	0.1
0.5	0.25	0.1
0.6	0.30	0.1

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表 2 模型试验得到的桩长减震效果

Table 2. Shock absorption effect of pile length obtained from model test

工况	桩长/m	加速度平均值/（m·s⁻²）	加速度放大系数/%	减震率/%
无桩	—	1.523	100.0	0.0
工况1	0.2	1.238	81.3	18.7
工况2	0.3	0.963	63.2	36.8
工况3	0.4	0.859	56.4	43.6
工况4	0.5	0.797	52.3	47.7
工况5	0.6	0.765	50.2	49.8

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表 3 模型试验得到的桩间距减震效果

Table 3. Seismic reduction effect of pile spacing obtained from model test

工况	桩间距/m	加速度平均值/（m·s⁻²）	加速度放大系数/%	减震率/%
无桩	—	1.523	100.0	0.0
工况1	0.10	0.661	43.4	56.6
工况2	0.15	0.734	48.2	51.8
工况3	0.20	0.963	63.2	36.8
工况4	0.25	1.086	71.3	28.7
工况5	0.30	1.234	81.4	18.6

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表 4 有限元材料参数

Table 4. Finite element material parameters

材料	厚度/m	密度/（kg·m⁻³）	弹性模量/Pa	泊松比	瑞利阻尼系数α	瑞利阻尼系数β
桩	—	2 200	2.2×10¹⁰	0.20	0.434 53	0.002 07
黏土层	4.0	1 850	6.0×10⁷	0.25	1.159 02	0.005 50
砂土层	8.0	1 750	8.0×10⁷	0.30	1.150 23	0.005 30

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表 5 数值分析得到的桩长减震效果

Table 5. Seismic reduction effect of pile length obtained by numerical analysis

工况	桩长/m	加速度平均值/ （m·s⁻²）	加速度放大系数/%	减震率/%
无桩	—	1.421	100.0	0.0
工况1	2.0	1.186	83.5	16.5
工况2	3.0	1.022	71.9	28.1
工况3	4.0	0.899	63.3	36.7
工况4	5.0	0.817	57.5	42.5
工况5	6.0	0.784	55.2	44.8

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表 6 数值分析得到的桩间距减震效果

Table 6. Seismic reduction effect of pile spacing obtained by numerical analysis

工况	桩间距/m	加速度平均值/ （m·s⁻²）	加速度放大系数/%	减震率/%
无桩	—	1.421	100.0	0.0
工况1	1.0	0.769	54.1	45.9
工况2	1.5	0.864	60.8	39.2
工况3	2.0	1.022	71.9	28.1
工况4	2.5	1.091	76.8	23.2
工况5	3.0	1.215	85.5	14.5

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