XCC群桩限制液化侧向扩展的振动台试验研究

李文闻; 陈育民; 刘汉龙; 杨耀辉; 张鑫磊

doi:10.11779/CJGE201805021

XCC群桩限制液化侧向扩展的振动台试验研究 English Version

李文闻^{1, 2},
陈育民^1,2,,
刘汉龙^{1, 2, 3},
杨耀辉^{1, 2},
张鑫磊^{1, 2}

1. 河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京 210098;
2. 河海大学土木与交通学院,江苏南京 210098;
3. 重庆大学土木工程学院,重庆,400045

详细信息

作者简介:
李文闻（1991- ）,男,博士研究生,主要从事地震液化方面的研究。E-mail: lwwgeo@hotmail.com。

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出版历程
- 修回日期: 2017-02-22
- 发布日期: 2018-05-24

Shaking table tests on efficiency of improvement of X-section piles against lateral spreading

LI Wen-wen^{1, 2},
CHEN Yu-min^1,2,,
LIU Han-long^{1, 2, 3},
YANG Yao-hui^{1, 2},
ZHANG Xin-lei^{1, 2}

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;
2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;
3. College of Civil Engineering, Chongqing University, Chongqing 400045, China

摘要

摘要: 地震作用下,缓倾砂土地基会发生液化引发侧向扩展,对构筑物造成严重破坏,而可液化场地中的群桩可控制液化侧向变形的发展。现浇X形混凝土桩（XCC桩）较传统混凝土桩可以节省材料用量,其异形截面对于液化土体的流动变形的控制作用较圆形截面更具优势。开展了倾斜可液化地基中XCC群桩的振动台试验研究,对比了XCC群桩和圆桩群桩对液化侧向扩展变形的影响,同时考虑了群桩布置形式、XCC桩的截面朝向和截面异形效应对于处理效果的影响。结果表明：XCC桩可以较好的限制液化侧向扩展,与未处理场地相比,XCC桩处理场地的侧向位移减少约38%,流动面积减小约50%;在同等材料用量下,XCC桩处理效果优于传统圆桩,其流动面积较圆桩处理场地减少20%;梅花形群桩布置形式限制液化侧向扩展的效果明显好于正方形群桩布置形式;不同XCC桩的截面朝向的处理效果取决于其垂直于液化砂土流动方向的截面宽度,有效截面宽度越大则处理效果越好;XCC桩的截面异形效应能够提高限制液化侧向扩展效果约5%~18%左右。
- 振动台试验 /
- XCC桩 /
- 液化 /
- 侧向变形 /
- 流动面积 /
- 场地加固
Abstract: Lateral spreading often occurs in liquefiable sloping ground during earthquake, which causes severe damage to the nearby constructions. Installing piles into sloping ground has been proven to be effective in reducing the lateral displacement. The X-section cast-in-place concrete pile (XCC pile) can save material usage compared with the conventional circular pile. Besides, its special section shape has better effect in restraining the lateral flow of liquefied sand than circular section. A series of 1g shaking table tests are conducted to verify the efficiency of improvement of XCC piles against liquefaction-induced lateral flow. The mitigation efficiencies of XCC piles and circular pile are compared. Besides, the effects of pile arrangement pattern, orientation of X-section and special section are taken into consideration. The results suggest that the XCC pile can restrict the lateral displacement of liquefied sand, compared with the unimproved case, and the lateral displacement and flow area in XCC pile-improved case are reduced by 38% and 50%, respectively. With the same material usage, the mitigation efficiency of XCC piles is obviously higher than that of circular pile and the flow area is reduced by 20%. The triangular pile arrangement pattern is more effective in restricting the lateral spreading than square pile arrangement pattern. The mitigation efficiency of different orientations of XCC piles depends on the effective section length perpendicular to the direction of lateral flows. The special section effect of XCC piles can increase the mitigation effect by 5%~18%.
- shaking table test /
- XCC pile /
- liquefaction /
- lateral displacement /
- flow area /
- ground improvement

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参考文献(29)

[1]	HAMADA M, TOWHATA I, YASUDA S, et al. Study on permanent ground displacement induced by seismic liquefaction[J]. Computers and Geotechnics, 1987, 4(4): 197-220.
[2]	刘颖. 砂土震动液化[M]. 北京: 地震出版社, 1984. (LIU Ying. Liquefaction of sands induced by earthquake shaking[M]. Beijing: Seismology Press, 1984. (in Chinese))
[3]	中国赴日地震考察团. 日本阪神大地震考察[M]. 北京: 地震出版社, 1995. (Chinese Inspection Delegation for Kobe. Earthquake. Kobe earthquake damage inspection of Japan[M]. Beijing: Seisinological Press, 1995. (in Chinese))
[4]	MOTAMED R, TOWHATA I. Mitigation measures for pile groups behind quay walls subjected to lateral flow of liquefied soil: Shake table model tests[J]. Soil Dynamics and Earthquake Engineering, Elsevier, 2010, 30(10): 1043-1060.
[5]	TAKAHASHI H Ã, TAKAHASHI N, MORIKAWA Y Ã, et al. Efficacy of pile-type improvement against lateral flow of liquefied ground[J]. Géotechnique, 2016, 66(8): 617-626.
[6]	YASUDA S, NAGASE H, KIKU H. Appropriate countermeasures against permanent ground displacement due to liquefaction[C]// 10th World Conference on Earthquake Engineering Madrid, 1992: 1471-1476.
[7]	IAI S. Remediation of liquefiable soils for port structures in japan—analysis, design and performance[J]. Journal of Earthquake Engineering, 2005, 9(S1): 77-103.
[8]	ARMSTRONG R J, BOULANGER R W, BEATY M H. Equivalent static analysis of piled bridge abutments affected by earthquake-induced liquefaction[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2014, 140(8): 4014046.
[9]	GONZÁLEZ L, ABDOUN T, DOBRY R. Effect of soil permeability on centrifuge modeling of pile response to lateral spreading[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2009, 135(1): 62-73.
[10]	BOULANGER B R W, CURRAS C J, MEMBER S, et al. Seismic soil-pile-structure interaction experiments and analyses[J]. Journal of Geotechnical and Geoenvironmental Engineering, 1999, 125(9): 750-759.
[11]	ABDOUN T, DOBRY R, O’ROURKE T D, et al. Pile response to lateral spreads: centrifuge modeling[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2003, 129(10): 869-878.
[12]	BRANDENBERG S J, BOULANGER R W, KUTTER B L, et al. Behavior of pile foundations in laterally spreading ground during centrifuge tests[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2005, 131(11): 1378-1391.
[13]	黄雨, 八嶋厚, 张锋. 液化场地桩–土–结构动力相互作用的有限元分析[J]. 岩土工程学报, 2005, 27(6): 646-651. (HUANG Yu, YASHIMA A, ZHANG Feng. Finite element analysis of pile-soil-structure dynamic interaction in liquefiable site[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(6): 646-651. (in Chinese))
[14]	凌贤长, 王东升, 王志强, 等. 液化场地桩-土-桥梁结构动力相互作用大型振动台模型试验研究[J]. 土木工程学报, 2004, 37(11): 67-72. (LING Xian-zhang, WANG Dong-shen, WANG Zhi-qiang, et al. Large-scale saking table model test of dynamic soil-pile-bridge structure interaction in ground of liquefaction[J]. China Civil Engineering Journal, 2004, 37(11): 67-72. (in Chinese))
[15]	HAMADA M. Performances of foundations against liquefaction-induced permanent ground displacements[C]// Proceedings of the 12th World Conference on earthquake engineering. Auckland, 2000: 1-8.
[16]	YASUDA S, ISHIHARA K, MORIMOTO I, et al. Large- scale shaking table tests on pile foundations in liquefied ground[C]// Proceedings of the 12th World Conference on Earthquake Engineering. Auckland. 2000: 1-8.
[17]	MOTAMED R, TOWHATA I, HONDA T, et al. Pile group response to liquefaction-induced lateral spreading: E-Defense large shake table test[J]. Soil Dynamics and Earthquake Engineering, 2013, 51: 35-46.
[18]	ASHFORD S, JUIRNARONGRIT T, SUGANO T, et al. Soil-pile response to blast-induced lateral spreading I: field test[J]. Journal of Geotechnical, 2006, 132(2): 152-162.
[19]	WEAVER T J, ASHFORD S A, ROLLINS K M. Response of 0.6 m cast-in-steel-shell pile in liquefied soil under lateral loading[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2005, 131(1): 94-102.
[20]	ROLLINS K M, GERBER T M, LANE J D, et al. Lateral resistance of a full-scale pile group in liquefied sand[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2005, 131(1): 115-125.
[21]	MADABHUSHI G, KNAPPETT J, HAIGH S. Design of pile foundations in liquefiable soils[M]. London: UK: Imperial College Press, 2009.
[22]	BOULANGER R, KUTTER B, BRANDENBERG S. Pile foundations in liquefied and laterally spreading ground during earthquakes: centrifuge experiments & analyses[R]. Davis: University of Califonia Davis, 2003.
[23]	BRANDENBERG S J, BOULANGER R W, KUTTER B, et al. Static pushover analyses of pile groups in liquefied and laterally spreading ground in centrifuge tests[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133(9): 1055-1066.
[24]	刘汉龙, 刘芝平, 王新泉. 现浇X型混凝土桩截面几何特性研究[J]. 中国铁道科学, 2009, 30(1): 17-23. (LIU Han-long, LIU Zhi-ping, WANG Xin-quan. Analysis on section geometry character of X style vibro-pile[J]. China Railway Science, 2009, 30(1): 17-23. (in Chinese))
[25]	刘汉龙, 金辉, 丁选明, 等. 现浇X形混凝土桩沉桩挤土效应现场试验研究[J]. 岩土力学, 2012, 33(2): 219-223, 228. (LIU Han-long, JIN Hui, DING Xuan-ming, et al. Field test research on squeezing effects of X-section cast-in-place concrete pile[J]. Rock and Soil Mechanics, 2012, 33(S2): 219-223, 228. (in Chinese))
[26]	刘汉龙, 吕亚茹, 丁选明, 等. 现浇X形桩复合地基桩侧摩阻力分布特性[J]. 中国公路学报, 2012, 25(6): 17-23. (LIU Han-long, LU Ya-ru, DING Xuan-ming et al. Behavior of side friction of X-section cast-in-place concrete pile composite foundation[J]. China Journal of Highway and Transport, 2012, 25(6): 17-23. (in Chinese))
[27]	刘汉龙, 孙广超, 孔纲强, 等. 无砟轨道 X 形桩-筏复合地基动土压力分布规律试验研究[J]. 岩土工程学报, 2016, 38(11): 1933-1940. (LIU Han-long, SUN Guang-chao, KONG Gang-qiang, et al. Model tests on distribution law of dynamical soil pressure of ballastless track XCC pile-raft composite foundation[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(11): 1933-1940. (in Chinese))
[28]	王智强, 刘汉龙, 张敏霞, 等. 现浇 X 形桩竖向承载特性足尺模型试验研究[J]. 岩土工程学报, 2010, 32(6): 903-907. (WANG Zhi-qiang, LIU Han-long, ZHANG Min-xia, et al. Full scale model tests on vertical bearing characteristics of cast-in-place X-section piles[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(6): 903-907. (in Chinese))
[29]	IAI S. Similitude for shaking table tests on soil-structure- fluid model in 1 g gravitational field[J]. Soils and Foundations, 1989, 29(1): 105-118.