Vibroflotation method for foundation treatment of replaced sandy soil in deepwater marine environment

QING Zhi-guang; YUAN Xiao-ming; NIU Ben; CAO Zhen-zhong

doi:10.11779/CJGE202010020

Volume 42 Issue 10

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Chinese Journal of Geotechnical Engineering > 2020 > 42(10): 1940-1946. > DOI: 10.11779/CJGE202010020

QING Zhi-guang, YUAN Xiao-ming, NIU Ben, CAO Zhen-zhong. Vibroflotation method for foundation treatment of replaced sandy soil in deepwater marine environment[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(10): 1940-1946. DOI: 10.11779/CJGE202010020

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Vibroflotation method for foundation treatment of replaced sandy soil in deepwater marine environment

1.
Institution of Engineering Mechanics, China Earthquake Administration, Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Harbin 150080, China
2.
CCCC Key Laboratory of Environment Protection & Safety in Foundation Engineering of Transportation, Guangzhou 510230, China
3.
Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University of Technology, Guilin 541004, China

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Received Date: October 23, 2019
Available Online: December 07, 2022

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Abstract

The marine environment is special, and its geotechnical site conditions are more complex than those on land. There have been no engineering practices, technical standards and technological parameters for reference in the foundation treatment of vibration-impact method with a water depth of more than 20 m. The current codes and technical standards of vibration-impact method are mainly applicable to land foundations, based on the engineering experience of early stage and relatively backward equipments. The excavation of foundation trench and the replacement of medium-coarse sand are carried out on the undisturbed soil layer under water depths of 20~25 m in Abidjan Port, and the vibration-impact machines of 100, 180 and 230 kW are used to treat the replaced sand layer. The issues of common vibrator problems in deepwater marine environment are analyzed, and the vibration-impact depth, construction efficiency, foundation treatment effect and technological parameters of vibration-impact method in deep-water marine environment are discussed. The results indicate that: (1) In the marine environment, the vibrator is easy to detach, or break, or corrode, and it is difficult to penetrate to a design depth, so the appropriate vibration-impact equipments should be carefully selected. (2) The depth of water has a significant influence on the foundation treatment depth of vibration-impact method. The foundation treatment depths of 100, 180 and 230 kW-vibrator is 4~6, 6~8 and 8~10 m, respectively, which are significantly lower than those of land foundation under the same conditions. (3) Taking the horizontal treatment area of foundation as the evaluation standard of construction efficiency, the construction efficiency of 180 kW-vibrator is 56% higher than that of 100 kW, and the construction efficiency of 230 kW-vibrator is 125% higher than that of 100 kW. (4) The parameters of vibration-impact method in Abidjan port, such as water depths of 20~25 m, vibrator powers of 100~230 kW, treatment thicknesses of 10~19 m, horizontal spacings of 2~3.5 m, vibration retention time of 30 s, can provide reference for the foundation treatment of marine geotechnical engineering in countries along "Belt and Road Initiative" in the future.
- deep water,
- marine geotechnical engineering,
- foundation replacement,
- underwater vibration-impact,
- technological parameter

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[1]	王广生, 杨彦豪, 潘志刚. 重力式码头深水大厚度换填砂地基研究与实践[J]. 水运工程, 2019(7): 204-211. doi: 10.3969/j.issn.1002-4972.2019.07.036 WANG Guang-sheng, YANG Yan-hao, PAN Zhi-gang. Research and implementation of deep water and thick replaced sand foundation for gravity wharf[J]. Port & Waterway Engineering, 2019(7): 204-211. (in Chinese) doi: 10.3969/j.issn.1002-4972.2019.07.036
[2]	周健, 贾敏才, 池永. 无料振冲法加固粉细砂地基试验研究[J]. 岩石力学与工程学报, 2003, 22(8): 1350-1355. doi: 10.3321/j.issn:1000-6915.2003.08.023 ZHOU Jian, JIA Min-cai, CHI Yong. Vibroflotation compaction of silty fine sands without additional backfill materials[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(8): 1350-1355. (in Chinese) doi: 10.3321/j.issn:1000-6915.2003.08.023
[3]	楼晓明, 于志强, 徐士龙. 振冲法的现状综述[J]. 土木工程与管理学报, 2012, 29(3): 61-66. doi: 10.3969/j.issn.2095-0985.2012.03.013 LOU Xiao-ming, YU Zhi-qiang, XU Shi-long. Review on the present situation of vibroflotation improvement method[J]. Journal of Civil Engineering and Management, 2012, 29(3): 61-66. (in Chinese) doi: 10.3969/j.issn.2095-0985.2012.03.013
[4]	建筑地基处理技术规范：JGJ79—2012[S]. 2012. Technical code for ground treatment of buidings: JGJ79—2012[S]. 2012. (in Chinese)
[5]	冯强. 广州新沙工程大面积深水振冲加固[J]. 水运工程, 1992(3): 41-47. https://www.cnki.com.cn/Article/CJFDTOTAL-SYGC199203010.htm FENG Qiang. Large area and deep-water vibroflotation reinforcement of Xinsha project in Guangzhou[J]. Port & Waterway Engineering, 1992(3): 41-47. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SYGC199203010.htm
[6]	郑培成, 袁文明, 周荣官, 等. 厦门港东渡港区驳船码头基槽填砂的水下振密研究[C]//第三届全国地基处理学术讨论会论文集, 1992, 秦皇岛: 269-272. ZHENG Pei-cheng, YUAN Wen-ming, ZHOU Rong-guan, et al. Study on vibration density of underwater sand filling in foundation trench of barge Wharf in Dongdu port area of Xiamen Port[C]//The Third National Symposium on Foundation Treatment, 1992, Qinhuangdao: 269-272. (in Chinese)
[7]	冯强, 孔丽艳. 水下深层振冲法在港口工程中的应用[J]. 水运工程, 2000(7): 54-58. doi: 10.3969/j.issn.1002-4972.2000.07.014 FENG Qiang, KONG Li-yan. Application of underwater vibro-compaction method in port engineering[J]. Port & Waterway Engineering, 2000(7): 54-58. (in Chinese) doi: 10.3969/j.issn.1002-4972.2000.07.014
[8]	陈加庆. 厦门港某护岸工程砂基振冲密实处理[C]//第十二届中国海岸工程学术讨论会论文集, 2005, 昆明: 666-668. CHEN Jia-qing. Vibroflotation and compaction of sand foundation for a revetment project in Xiamen Port[C]//Proceedings of the 12th China Coastal Engineering Symposium, 2005, Kunming: 674-676. (in Chinese)
[9]	王立忠, 杨仲轩. 海洋岩土工程进展[J]. 国际学术动态, 2013(5): 21-23. WANG Li-zhong, YANG Zhong-xuan. Progress of marine geotechnical engineering[J]. International Academic Developments, 2013(5): 21-23. (in Chinese)
[10]	钱琨, 王新志, 陈剑文, 等. 南海岛礁吹填钙质砂渗透特性试验研究[J]. 岩土力学, 2017, 38(6): 1557-1564. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201706003.htm QIAN Kun, WANG Xin-zhi, CHEN Jian-wen, et al. Experimental study on permeability of calcareous sand for islands in the South China Sea[J]. Rock and Soil Mechanics, 2017, 38(6): 1557-1564. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201706003.htm
[11]	黄锐. 换填砂及振冲密实工艺在码头工程中的应用[J]. 中国水运, 2012, 12(2): 213-214, 219. https://www.cnki.com.cn/Article/CJFDTOTAL-ZSUX201202101.htm HUANG Rui. Application of sand replacement and vibro-compaction technology in Wharf Engineering[J]. China Water Transport, 2012, 12(2): 213-214, 219. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-ZSUX201202101.htm
[12]	张炜煌. 超深基础重力式码头结构选型与设计关键技术[J]. 水运工程, 2014(4): 52-56. https://www.cnki.com.cn/Article/CJFDTOTAL-SYGC201404014.htm ZHANG Wei-huang. Key technologies of structure selection and design for ultra -deep foundation trench gravity quay[J]. Port & Waterway Engineering, 2014(4): 52-56. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SYGC201404014.htm
[13]	叶书鳞. 地基处理工程实例应用手册[M]. 北京: 中国建筑工业出版社, 1998. YE Shu-lin. Application Manual of Foundation Treatment Engineering Example[M]. Beijing: China Architecture & Building Press, 1998. (in Chinese)
[14]	MOSELEY M P, PRIEBE H J. Vibro Techniques, Ground Improvement[M]. Maryland: Blackie Academic and Professional, 1993: 1-19.
[15]	SLOCOMBE B.C, BELLAL , BAEZHU . The densification of granular soils using vibro methods[J]. Géotechnique, 2000, 50(6): 715-72.
[16]	MITCHELL J K. In-place treatment of foundation soils[J]. Journal of the Soil Mechanics and Foundations Division, ASCE, 1970, 96(SM1): 73-110.
[17]	周健, 王冠英, 贾敏才. 无填料振冲法的现状及最新技术进展[J]. 岩土力学, 2008, 29(1): 37-42. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX200801009.htm ZHOU Jian, WANG Guan-ying, JIA Min-cai. Situation and latest technical progress of vibroflotation without additional backfill reinforcement[J]. Rock and Soil Mechanics, 2008, 29(1): 37-42. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX200801009.htm
[18]	韩冉冉, 徐满意, 乔小利. 水下超软土地基振冲碎石桩试验及参数控制[J]. 岩土工程学报, 2013, 35(增刊2): 612-616. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2013S2109.htm HAN Ran-ran, XU Man-yi, QIAO Xiao-li. Vibro- replacement stone column tests and parameter controls of under water soft soil foundation[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(S2): 612-616. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2013S2109.htm