[1]李雨润,胡森,邹泽,等.对称斜群桩侧向动力响应及p-y曲线规律对比试验研究[J].自然灾害学报,2020,29(02):010-21.[doi:10.13577/j.jnd.2020.0202]
 LI Yurun,HU Sen,ZOU Ze,et al.Comparative experimental research on lateral dynamic response and p-y curve rule of symmetrical vertical and batter pile groups[J].,2020,29(02):010-21.[doi:10.13577/j.jnd.2020.0202]
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对称斜群桩侧向动力响应及p-y曲线规律对比试验研究
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
29
期数:
2020年02期
页码:
010-21
栏目:
出版日期:
2020-04-28

文章信息/Info

Title:
Comparative experimental research on lateral dynamic response and p-y curve rule of symmetrical vertical and batter pile groups
作者:
李雨润12 胡森1 邹泽1 姜志3
1. 河北工业大学 土木与交通学院, 天津 300401;
2. 河北省土木工程技术研究中心, 天津 300401;
3. 邢台路桥建设总公司, 河北 邢台 054001
Author(s):
LI Yurun12 HU Sen1 ZOU Ze1 JIANG Zhi3
1. College of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China;
2. Civil Engineering Technology Research Center of Hebei Province, Tianjin 300401, China;
3. Xingtai Road&Bridge Construction Corporation, Xingtai 054001, China
关键词:
对称四斜桩饱和砂土不同频率正弦波振动台试验p-y曲线侧向动力响应
Keywords:
symmetrical four batter pilesaturated sandsine wave with different frequencyshaking table testp-y curvelateral dynamic response
分类号:
TU4;X9
DOI:
10.13577/j.jnd.2020.0202
摘要:
通过电磁式振动台试验方法,根据相似比理论设计制作对称四直桩和对称四斜桩模型,进行饱和砂土中直斜群桩侧向动力响应试验研究。台面输入加速度峰值为0.15g的正弦波,其频率大小分别为1.5Hz、3Hz和6Hz,以对比分析在不同频率正弦波输入下的斜群桩侧向动力响应特性和p-y滞回曲线规律。试验研究结果表明:(1)在不同频率输入下,通过对比承台加速度和位移峰值大小,对称四斜桩能有效减小桩身的侧向动力响应,在抵抗水平地震作用方面效果要好于四直桩模型;(2)饱和砂土的液化速度与输入正弦波频率成正相关;(3)孔压上升初期p-y滞回曲线不规则,包围面积较小;孔压快速上升周期的p-y滞回曲线近乎椭圆形,包围面积增加,滞回耗能变大,桩土相对位移的正负变化体现了桩土互推的作用过程;(4)土样中接近土表面位置处的p-y滞回曲线的面积略大于较深处点,说明靠近土表位置处的桩土相互作用耗能更加显著。
Abstract:
At present, the dynamic response of batter piles and the interaction between pile and soil in saturated sand under earthquake action are hot issues in seismic research of pile foundation. In this paper, the symmetrical four vertical pile and the symmetrical four batter pile model are designed according to the similarity ratio theory by electromagnetic vibration table test method, and the lateral dynamic response test of vertical and batter pile groups in saturated sand is studied. The sinusoidal wave with the peak input acceleration of 0.15g is 1.5Hz, 3Hz and 6Hz, respectively. The lateral dynamic response characteristics and p-y hysteresis curve of batter pile groups under different frequency sine wave input are compared and analyzed. The results show that: (1) Under different frequency input, by comparing the acceleration of the cap and displacement peak size, the symmetrical four batter pile can effectively reduce the lateral dynamic response of pile body, which is better than the four vertical pile model in resisting horizontal seismic action; (2) the liquefaction speed of saturated sand is positively correlated with the input sine wave frequency; (3) the p-y hysteretic curve is irregular and the surrounding area is small at the initial stage of pore pressure rise; the p-y hysteretic curve of the rapid rising period of pore pressure is almost elliptic, the surrounding area increases, the hysteretic energy dissipation increases, and the positive and negative changes of relative displacement of pile and soil reflect the process of mutual pushing between pile and soil; (4)in the soil sample, the area of p-y hysteretic loop near the soil surface is slightly larger than the deeper point, indicating that the pile-soil interaction near the soil surface consumes more energy.

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备注/Memo

备注/Memo:
收稿日期:2019-09-24;改回日期:2019-12-09。
基金项目:国家自然科学基金资助项目(51778207);河北省自然科学基金资助项目(E2018202107)
作者简介:李雨润(1978-),男,教授,博士生导师,主要从事土动力学与桩基抗震方面的研究.E-mail:iemlyr7888@hebut.edu.cn
通讯作者:胡森(1996-),男,硕士研究生,主要从事桩基动力响应研究.E-mail:a642265556@163.com
更新日期/Last Update: 1900-01-01