Influencing mechanism of cement-soil reinforcement on lateral dynamic response of single pile
-
摘要: 水泥土复合桩常被用作近海桥梁或风机基础以抵抗自然环境下水平动力荷载引起的基础侧向振动。本文通过理论推导建立了侧向动力荷载作用下水泥土复合桩-桩侧土体耦合振动的理论模型,并通过解析求解得到了桩顶水平和摇摆动阻抗。最后,通过数值算例和参数分析讨论了水泥土参数对桩顶动阻抗的影响。结果表明:水泥土加固厚度增大会提高桩顶水平和摇摆动阻抗,但不利于高频振动时的水平动阻抗;水泥土加固深度不宜超过其有效加固深度;水泥土弹性模量的增大有利于提高桩顶动阻抗。Abstract: Cement-soil composite pile is often utilized as the foundation of offshore bridges or wind turbines to resist lateral vibrations in natural environments. A mathematical model is proposed for the coupled vibration of the cement-soil composite pile and the soil around the pile under lateral dynamic loads through theoretical derivation. Then, the analytical expressions for the horizontal and rocking dynamic impedances at the pile head are obtained through theoretical derivation. Finally, the influence of cement-soil parameters on the dynamic impedance are studied through numerical calculation and parametric analysis. The results reveal that the increase of the cement-soil radius will increase the horizontal and rocking dynamic impedances, but it is not conducive to the horizontal dynamic impedance at high frequency vibration. The cement-soil depth should not exceed its effective reinforcement depth. The increase of the cement-soil elastic modulus is beneficial to improve the dynamic impedance of pile head.
-
-
-
[1] 张永刚, 李俊才, 邓亚光, 等. 管桩水泥土复合桩挤土效应现场试验[J]. 地下空间与工程学报, 2015, 11(3): 601-606. https://www.cnki.com.cn/Article/CJFDTOTAL-BASE201503012.htm ZHANG Yonggang, LI Juncai, DENG Yaguang, et al. Field test on soil compacting effect of composite pile made up of jet-mixing cement and PHC pile[J]. Chinese Journal of Underground Space and Engineering, 2015, 11(3): 601-606. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-BASE201503012.htm
[2] 王安辉, 章定文, 刘松玉, 等. 水平荷载下劲性复合管桩的承载特性研究[J]. 中国矿业大学学报, 2018, 47(4): 853-861. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGKD201804020.htm WANG Anhui, ZHANG Dingwen, LIU Songyu, et al. Bearing capacity behavior of strength composite pipe pile subjected to lateral loading[J]. Journal of China University of Mining & Technology, 2018, 47(4): 853-861. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZGKD201804020.htm
[3] 王安辉, 章定文, 谢京臣. 软黏土中劲性复合桩水平承载特性p-y曲线研究[J]. 岩土工程学报, 2020, 42(2): 381-389. doi: 10.11779/CJGE202002020 WANG Anhui, ZHANG Dingwen, XIE Jingchen. P-y curves for lateral bearing behavior of strength composite piles in soft clay[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(2): 381-389. (in Chinese) doi: 10.11779/CJGE202002020
[4] 王建, 朱志慧, 王洪玉, 等. 黏土地基劲性复合桩水平承载性能数值分析[J]. 铁道科学与工程学报, 2020, 17(6): 1382-1389. https://www.cnki.com.cn/Article/CJFDTOTAL-CSTD202006007.htm WANG Jian, ZHU Zhihui, WANG Hongyu, et al. Numerical analysis on lateral bearing capacity of stiffened deep cement mixing piles in clay[J]. Journal of Railway Science and Engineering, 2020, 17(6): 1382-1389. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-CSTD202006007.htm
[5] 韦古强, 何子睿, 刘广东, 等. 水泥土复合单桩水平承载性能模型试验研究[J]. 太阳能学报, 2022, 43(12): 353-359. https://www.cnki.com.cn/Article/CJFDTOTAL-TYLX202212045.htm WEI Guqiang, HE Zirui, LIU Guangdong, et al. Experimental study on lateral bearing behavior of cement composite monopiles[J]. Acta Energiae Solaris Sinica, 2022, 43(12): 353-359. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-TYLX202212045.htm
[6] 朱锐, 周峰, 陈廷柱, 等. 劲性复合桩挤土效应及承载力作用机理研究[J]. 岩土力学, 2023, 44(12): 3577-3586. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX202312022.htm ZHU Rui, ZHOU Feng, CHEN Yanzhu, et al. Study on soil squeezing effect and bearing mechanism of strength composite pile[J]. Rock and Soil Mechanics, 2023, 44(12): 3577-3586. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX202312022.htm
[7] WONGLERT A, JONGPRADIST P. Impact of reinforced core on performance and failure behavior of stiffened deep cement mixing piles[J]. Computers and Geotechnics, 2015, 69: 93-104. doi: 10.1016/j.compgeo.2015.05.003
[8] WANG A H, ZHANG D W, DENG Y G. A simplified approach for axial response of single precast concrete piles in cement-treated soil[J]. International Journal of Civil Engineering, 2018, 16(10): 1491-1501. doi: 10.1007/s40999-018-0341-9
[9] ZHANG C Z, LIU S Y, ZHANG D W, et al. A modified equal-strain solution for consolidation behavior of composite foundation reinforced by precast concrete piles improved with cement-treated soil[J]. Computers and Geotechnics, 2022, 150: 104905. doi: 10.1016/j.compgeo.2022.104905
[10] WANG A H, ZHANG D W, DENG Y G. Lateral response of single piles in cement-improved soil: numerical and theoretical investigation[J]. Computers and Geotechnics, 2018, 102: 164-178. doi: 10.1016/j.compgeo.2018.06.014
[11] ZHANG Z, YE G B, CAI Y S, et al. Centrifugal and numerical modeling of stiffened deep mixed column-supported embankment with slab over soft clay[J]. Canadian Geotechnical Journal, 2019, 56(10): 1418-1432. doi: 10.1139/cgj-2018-0180
[12] ZHANG D W, WANG A H, DING X M. Seismic response of pile groups improved with deep cement mixing columns in liquefiable sand: shaking table tests[J]. Canadian Geotechnical Journal, 2022, 59(6): 994-1006. doi: 10.1139/cgj-2020-0505
[13] 王安辉, 章定文, 张艳芳. 砂土中水泥土复合管桩震动响应试验研究[J]. 岩土工程学报, 2021, 43(增刊2): 121-124. doi: 10.11779/CJGE2021S2029 WANG Anhui, ZHANG Dingwen, ZHANG Yanfang. Seismic responses of pipe piles improved with cement-treated soil in sand[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(S2): 121-124. (in Chinese) doi: 10.11779/CJGE2021S2029
[14] DAI G L, OUYANG H R, GAO L C, et al. Monotonic and cyclic lateral behavior of semi-rigid pile in cement-improved clay: centrifuge tests and numerical investigation[J]. Acta Geotechnica, 2023, 18(8): 4157-4181. doi: 10.1007/s11440-023-01809-4
[15] OUYANG H R, DAI G L, GAO L C, et al. Lateral response of monopile reinforced by cement-improved soil in clay to monotonic and cyclic loadings: laboratory model test and theoretical investigation[J]. Marine Structures, 2023, 89: 103403. doi: 10.1016/j.marstruc.2023.103403
[16] DING Xuanming, ZHENG Changjie, LUAN Lubao. Principles of Pile Dynamics[M]. Beijing: Science Press, 2021. (in Chinese) [17] NOVAK M, NOGAMI T. Soil-pile interaction in horizontal vibration[J]. Earthquake Engineering & Structural Dynamics, 1977, 5(3): 263-281.
[18] SONG Yizhong, BU Fadong, CHENG Haitao. New Type Composite Pile[M]. Beijing: China Architecture & Building Press, 2017. (in Chinese) -
期刊类型引用(2)
1. 王鹏程,徐安花,房建宏. 察尔汗盐湖地区过盐渍土动剪切模量与阻尼比试验研究. 公路. 2021(06): 43-48 . 百度学术
2. 刘超,屈俊童,段自侠,张翔,杨擎宇. 洱海泥炭质土动剪切模量和阻尼比试验研究. 地下空间与工程学报. 2021(05): 1479-1485 . 百度学术
其他类型引用(17)