|
|
|
| Shaking table test on pre-stressed anchor cable anti-slide pile with an external anchor structure and a buffer spring |
| YANG Yun1,2, JIANG Liangwei1,2, LUO Qiang1,2, ZHANG Tong1,2, ZHANG Hanwen1,2, GE Xuejun3 |
| 1．School of Civil Engineering，Southwest Jiaotong University，Chengdu 610031，China;
2．MOE Key Laboratory of High-Speed Railway，Southwest Jiaotong University，Chengdu 610031，China;
3.China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031，China |
|
|
|
|
Abstract Failure of anchor cable will lead to a sudden change of stress mode of anchor cable pile and result in the whole structure overturning. It is an urgent problem on how to avoid dynamic overload of anchor cable under earthquake. Based on the flexible buffer principle, table model tests of anchor cable pile of cutting slope were designed by connecting buffer spring at the external anchor structure between anchor cable and pile body. The time-history characteristics of axial force of anchor cable, acceleration of soil behind pile and inclined angle of pile, and the effect of spring buffering anchor head on structural responses were tested under 0.2g, 0.4g and 0.6g. Combined with the frequency response characteristics of anchor cable tension, the spring weakening mechanism was explored. The results show that the acceleration amplification factor in the middle decrease slightly after the spring was installed, the inclined angle generally exceed that of the ordinary pile, and the growth degree decrease with the increase of PGA. The axial force and stress amplitude of the anchor cable of the spring anchor head pile are greatly reduced, and the load reduction degree of the time-history peak value and fluctuation amplitude is consistent and approximately linearly negative in correlation with PGA. The load reduction ratios under three earthquake magnitudes are 65%, 57% and 46%, respectively, and the total fatigue damage value of the anchor cable calculated by linear cumulative damage theory decrease by about 2 ~ 3 orders. Setting buffer spring can significantly reduce the tension response energy of anchor cable, and the Fourier amplitude spectrums show the frequency response characteristics of narrow bandwidth and low-frequency concentration, which reduces the risk of medium and high-frequency fatigue damage caused by repeated loading and unloading during the earthquake and effectively improves the stress of anchor cable.
|
|
Received: 12 August 2022
Published: 28 September 2023
|
|
|
|
[1] 余振锡.预应力锚索抗滑桩在滑坡治理中的应用[J].金属矿山,1998,(04):10-12,27.
YU Zhenxi. Application of pre-stressed anchor rope antislipping piles in slope slipping control[J].Mental Mine, 1998,(04):10-12.
[2] 周德培,张建经,汤涌.汶川地震中道路边坡工程震害分析 [J].岩石力学与工程学报,2010,29(3):565-576.
ZHOU Depei, ZHANG Jianjing, TANG Yong. Sesmic damage analsysis of road slopes in wenchuan earthquake [J].Chinese Journal of Rock Mechanics and Engineering, 2010, 29(3): 565-576.
[3] 周德培,王建松.预应力锚索桩内力的一种计算方法[J].岩石力学与工程学报, 2002,21(2):247-250.
ZHOU Depei, WANG Jiansong.Deign method of retainning pile with prestressed cable [J]. Chinese Journal of Rock Mechanics and Engineering,2002,21(2):247-250.
[4] 刘小丽,张占民,周德培.预应力锚索抗滑桩的改进计算方法[J].岩石力学与工程学报,2004.23(15):2568- 2572.
LIU Xiaoli, ZHANG Zhanming, ZHOU Depei.Improved method for computing anti-sliding pile with prestressed anchoring cable[J].Chinese Journal of Rock Mechanics and Engineering, 2004,23(15): 2568-2572.
[5] 曲宏略，张建经，朱大鹏.预应力锚索桩板墙抗震设计计算方法研究[J].岩石力学与工程学报.2013,(Z2): 4149-4156.
QU Honglue，ZHANG Jianjing，ZHU Dapeng, Research on asesimic design of prestressed anchor sheet[J].Chinese Journal of Rock Mechanics and Engineering, 2013, (Z2): 4149-4156.
[6] 张朋.基底铰支承预应力锚索抗滑桩地震动力响应特性研究[D].昆明:昆明理工大学, 2019.
[7] 武志信.BFRP锚杆(索)在高烈度地震区响水河高边坡防护中的大型振动台试验研究[D].兰州:兰州交通大学, 2020.
[8] 叶海林,郑颖人,李安洪,等.地震作用下边坡预应力锚索振动台试验研究[J].岩石力学与工程学报, 2012. 31(Z1): 2847-2854.
YE Hailin,ZHENG Yinren,LI Anhong,et al.Shaking table test studio of prestressed anchor cable of slope under earthquake[J]. Chinese Journal of Rock Mechanics and Engineering, 2012. 31(Z1): 2847-2854.
[9] 郑文博,庄晓莹,蔡永昌,等.地震作用下预应力锚索对岩石边坡稳定性影响的模拟方法及锚索优化研究[J].岩土工程学报,2012,34(09): 1668-1676.
ZHENG Wenbo, ZHUANG Xiaoying, CAI Yongchang, et al. Modeling of prestressed anchors in rock slope under earthquake and optimization of anchor arrangement [J]. Chinese Journal of Geotechnical Engineering, 2012, 34(9): 1668-1676.
[10] Inglis D, Macleod G, Naesgaard E, et al. Basement wall with seismic earth pressures and novel expanded polystyrene foam buffer layer [C]//Tenth Annual Symposium of the Vancouver Geotechnical Society. Vancouver, BC,Canada:[s.n. ],1996.
[11] 建筑抗震设计规范:JB 50011 2010[S].北京：中国建筑工业出版社,2016.
Technical code for building pile foundation JB 50011 2010[S].Beijing:China Architecture and Building Press, 2016.
[12] 翁大根,吕西林.消能减震结构设计参数研究与试验验证[J].地震工程与工程振动, 2004,24(2): 150-157.
WENG Dagen, LV Xilin.Study on design parameters of energy dissipation structures with experiment verification [J].Eearthquake engineering and engineering vibration, 2004,24(02):150-157.
[13] 邹立华,孙琪,方雷庆,等.柔性桩隔震消能体系的振动控制研究[J]. 振动与冲击, 2010. 29(11): 147-151.
ZOU Lihua, SUN Qi,FANG Leiqing,et al.Study on Vibration Control of Flexible Pile Isolation Energy Dissipation System[J]. Journal of Vibration And Shock. 2010. 29(11): 147-151.
[14] 陈艺文.边坡的动力响应及新型耗能预应力锚索抗震性能研究[D],石家庄：石家庄铁道大学, 2020.
[15] 冯帅,吴红刚,艾挥,等.预应力锚索抗滑桩抗震优化设计与试验研究[J].科学技术与工程, 2018.18(12):248-255.
FENG Suai,WU Honggang,AI Hui,et al.Seismic optimum design and experimental research on anti slide pile with pre-stressed anchor cable［J］.Science Technology and Engineering，2018，18(12):248-255.
[16] Dou H, Byrne P M. Model studies of boundary effect on dynamicsoil response[J].Canadian Geotechnical Journal, 1997,34(3):460-465.
[17] Hardin B O, Drnevich V P. Shear modulus and damping in soils: Design equations and curves[J]. Journal of the Soil Mechanics and Foundations Division, 1972, 98(7): 667–692.
[18] Wood D M. Geotechnical modeling[M]. London: Taylor & Francis Group, 2004.
[19] 李焕焕.抗滑桩设计推力和桩间距的计算方法及失效预警研究[D].西安:长安大学,2018.
[20] 刘龙涛,李传日,程祺,等.某结构件的随机振动疲劳分析[J].振动与冲击, 2013.32(21): 97-101.
LIU Longtao,LI Chuanri,CHENG Qi,et al.Random vibration fatigue analysis for a structure[J]. Journal of Vibration And Shock, 2013.32(21): 97-101.
[21] 陆明万,寿比南,杨国义.疲劳分析中变幅载荷的循环计数方法[J].压力容器，2012,29(11): 25-29,6.
LU Mingwan,SHOU Binan ,YANG Guoyi.Cycle counting methods of variable amplitude loading for fatigue analysis[J]. Pressure Vessel Technology, 2012,29(11):25-29,6.
[22] 王晓钢,郭杏林,张小鹏.利用热像法快速获取Q235钢的疲劳极限与S-N曲线[C]//第八届全国MTS材料试验学术会议论文集.台南:[s.n.],2010:964-968.
WANG Xiaogang,GUO Xinlin, ZHANGP Xiapeng. Using thermography to obtain the fatigue limit and S-N curve of Q235 steel rapidly[C]//Proceedings of Eighth National Conference on MTS Materials Testing.Tainan: [s.n.], 2010: 964-968.
[23] F.Sansoz,H.Ghonem.Effects of loading frequency on fatigue crack growth mechanisms in α/β Ti microstructure with large colony size[J].Materials Science and Engineering,
2003, 356(12): 81-92.
|
|
|
|
