高应变动测技术在如东海域大直径钢管桩基工程中的应用研究

顾龙声; 张宇亭

doi:10.11779/CJGE2024S10010

高应变动测技术在如东海域大直径钢管桩基工程中的应用研究 English Version

顾龙声^1,,
张宇亭^2, ,

1.
天津水运工程勘察设计院有限公司, 天津 300456
2.
交通运输部天津水运工程科学研究院, 天津 300456

基金项目:

天津水运工程勘察设计院有限公司科研创新基金项目 SJY202110

详细信息

作者简介:
顾龙声(1987—)，男，硕士，高级工程师，主要从事海洋岩土工程方面的研究工作。E-mail: 675141004@qq.com

通讯作者:
张宇亭, E-mail: tkszyt@163.com

中图分类号: TU473.1
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出版历程
- 收稿日期: 2024-04-30
- 刊出日期: 2024-07-31

Application of high-strain testing in large-diameter steel pipe pile project in Rudong sea area

GU Longsheng^1,,
ZHANG Yuting^2, ,

1.
Tianjin Survey and Design Institute for Water Transport Engineering Co., Ltd., Tianjin 300456, China
2.
Tianjin Research Institute for Water Transport Engineering, M.O.T., Tianjin 300456, China

摘要

摘要: 基于江苏如东海域三根大直径敞口钢管桩的初打和复打高应变动测试验数据，提出了适用于该海域的桩端折减系数η的推荐值和承载力恢复计算公式，为该海域大直径钢管桩基础的承载力评估提供了技术依据。敞口钢管桩高应变试验数据显示，试验桩侧阻力的恢复系数都远大于端阻力的，且桩侧阻力随时间增长显著，但端阻力的增长却很小。基于此，推荐如东海域大直径敞开钢管桩的桩端阻力折减系数η取0.05进行估算。此外，通过桩基土体恢复和增长机理探讨，提出桩基承载力恢复计算公式，且验证误差在10%以内。
- 海上风电 /
- 高应变动测 /
- 大直径钢管桩 /
- 桩端折减系数 /
- 桩基承载力恢复
Abstract: Based on the initial and repeated high-strain test data of three large-diameter open steel pipe piles in Rudong sea area of Jiangsu Province, a pile end reduction coefficient η applicable to the sea area and the formula for calculating the recovery of bearing capacity is proposed, and a technical basis for evaluating the bearing capacity of large-diameter steel pipe piles in the sea area is provided. According to the high-strain test data of open steel pipe piles, the recovery coefficients of the lateral resistance of the test piles are much greater than those of the end resistance, and the lateral resistance of the piles increases significantly over time, but the increase in the end resistance is very small. Based on this, it is recommended to use the pile end resistance reduction coefficient η= 0.05 for large-diameter open steel pipe piles in the Rudong sea area. In addition, by exploring the recovery and growth mechanism of pile foundation soil, a formula for calculating the recovery of pile foundation bearing capacity is proposed, and the verification error is within 10%.
- offshore wind power /
- high-strain testing /
- large-diameter steel pipe pile /
- pile end reduction coefficient /
- recovery of pile foundation bearing capacity

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图 1 初打CAPWAP动测分析曲线（^#43）

Figure 1. Dynamic test and analysis curve of first strike(pile No. 43)

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图 2 复打CAPWAP动测分析曲线（^#43）

Figure 2. Dynamic test and analysis curve of restrike(pile No.43)

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表 1 土层基本物理力学参数

Table 1 Basic physical and mechanical parameters of soil layers

地层编号	土层厚度/m	含水率 w₀/%	密度 ρ/(g·cm^-3)	孔隙比e	压缩（固结）试验		固结快剪试验		CPTU
地层编号	土层厚度/m	含水率 w₀/%	密度 ρ/(g·cm^-3)	孔隙比e	压缩系数 a_v0.1-0.2/MPa^-1	压缩模量 E_S0.1-0.2/MPa	黏聚力 c/kPa	内摩擦角 φ/(°)	q_c/ MPa	f_s/ kPa
②-1	0~9.7	23.7	1.99	0.674	0.17	10.28	5.0	33.3	8.31	70.39
②-2	0.9~5.2	33.6	1.88	0.940	0.36	5.61	29.0	15.0	3.00	49.55
③-1	12.8~14.8	23.6	1.98	0.682	0.18	10.18	4.5	33.7	9.40	80.45
④-2	7.2~8.7	33.2	1.88	0.935	0.39	5.08	28.0	15.2	3.42	65.06
⑤	1.7~10.5	26.9	1.93	0.777	0.26	7.13	6.5	32.6	8.32	70.32
⑥-1	14.8~20.9	21.8	2.02	0.628	0.16	11.02	3.2	33.8	14.43	106.52
⑥-2	0.6~9.9	31.5	1.90	0.886	0.39	5.06	21.0	21.2	—	—
⑥-3	11.0~16.7	21.3	2.03	0.606	0.15	11.81	2.6	34.1	31.82	151.5
⑦-3	8.9~13.3	22.1	2.01	0.632	0.16	11.18	2.8	34.0	—	—

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表 2 桩基础的设计

Table 2 Design of pile foundation

桩号	桩长/m	外径，壁厚/mm	入土深度/m
^#1	68.5	6000，60	49.00
^#43	74.0	6400，70	49.45
^#66	91.0	7000，70	54.30

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表 3 承载力分析结果

Table 3 Distribution of bearing capacity of piles

桩号	测试内容	检测日期	休止时间/d	传递能量/kJ	实测曲线拟合法			侧阻力恢复系数	端阻力恢复系数	承载力恢复系数	拟合质量MQ
桩号	测试内容	检测日期	休止时间/d	传递能量/kJ	侧阻力/ kN	端阻力/ kN	单桩极限承载力/kN	侧阻力恢复系数	端阻力恢复系数	承载力恢复系数	拟合质量MQ
^#1	初打	2021-10-10	—	598.0	28437	9938	38275	1.70	1.31	1.60	4.14
^#1	复打	2021-10-24	14	414.7	48202	13006	61208	1.70	1.31	1.60	4.10
^#43	初打	2021-06-06	—	761.9	21216	10115	31331	1.97	1.25	1.74	4.20
^#43	复打	2021-06-10	4	735.3	41739	12670	54409	1.97	1.25	1.74	4.04
^#66	初打	2021-01-14	—	1198.5	33379	17506	50885	2.01	1.06	1.68	4.75
^#66	复打	2021-01-17	3	1494.2	66999	18508	85507	2.01	1.06	1.68	3.70
注：承载力恢复系数=复打承载力值/初打承载力值。

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表 4 端阻力值对比表

Table 4 Comparison of tip resistance of piles

桩号	实测端阻力/kN	计算值 ①/kN	η₁	计算值 ②/kN	η₂
^#1	13006	227634.3	0.057	259426.8	0.050
^#43	12670	233274.4	0.054	233932.8	0.054
^#66	18508	402536.2	0.046	353108.8	0.052

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表 5 承载力实测值与计算值对比表

Table 5 Comparison between measured and calculated values of bearing capacity of piles

桩号	Q_EOD/ kN	Q_t/ kN	t/d	李飒公式计算值/kN	误差率	Svinkin公式计算值/kN	误差率	Long公式计算值/kN	误差率
^#1	38275	61208	14	66759	9.1%	51080~69768	-16.5%~14.0%	48041~67703	-21.5%~10.6%
^#43	31331	54409	4	50059	-8.0%	36890~50386	-32.2%~-7.4%	36938~44232	-32.1%~-18.7%
^#66	50885	85507	3	79681	-6.8%	58213~79511	-31.9%~-7.0%	59134~68213	-30.8%~-20.2%

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参考文献(13)

[1]	LIU R, ZHOU L, LIAN J J, et al. Behavior of monopile foundations for offshore wind farms in sand[J]. Journal of Waterway Port Coastal and Ocean Engineering, 2015, 142(1): 04051010.
[2]	码头结构设计规范: JTS 167—2018[S]. 北京: 人民交通出版社, 2018. Wharf Structure Design Code: JTS 167—2018[S]. Beijing: China Communications Press, 2018. (in Chinese)
[3]	API RP 2A-WSD. Recommended Practice for Planning, Designing, and Constructing Fixed Offshore Platforms- Working Stress Design[S]. API Recommended Practice 2A-WSD, 2010.
[4]	倪敏. 大直径钢管桩竖向承载能力研究[D]. 天津: 天津大学, 2014. NI Min. Research on Axial Load-Bearing Capacity of Large Diameter Pipe Piles[D]. Tianjin: Tianjin University, 2014. (in Chinese)
[5]	刘润, 闫玥, 闫澍旺. 大直径超长桩后继打桩拒锤现象分析及单桩承载力计算[J]. 岩土力学与工程学报, 2008, 27(增刊2): 3459-3464. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2008S2027.htm LIU Run, YAN Yue, YAN Shuwang. Study on refusal of restarting of large diameter and deep penetration pile and bearing capacity calculation[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(S2): 3459-3464. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX2008S2027.htm
[6]	李飒, 李婷婷, 张树德, 等. 基于实测数据的桩基承载力恢复计算与分析[J]. 工程力学, 2018, 35(6): 182-190. https://www.cnki.com.cn/Article/CJFDTOTAL-GCLX201806023.htm LI Sa, LI Tingting, ZHANG Shude. A study on pile setup based on measured in situ data[J]. Engineering Mechanics, 2018, 35(6): 182-190. (in Chinese)). https://www.cnki.com.cn/Article/CJFDTOTAL-GCLX201806023.htm
[7]	杨生彬, 李友东. PHC管桩挤土效应试验研究[J]. 岩土工程技术, 2006, 20(3): 117-120. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGJ200603002.htm YANG Shengbin, LI Youdong. Experimental research on compacting effects of PHC piles[J]. Geotechnical Engineering Technique, 2006, 20(3): 117-120. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGJ200603002.htm
[8]	水运工程基桩试验检测技术规范: JTS 240—2020[S]. 北京: 人民交通出版社, 2020. Technical Code for Testing and Inspection of Waterway Engineering Foundation Piles: JTS 240—2020[S]. Beijing: China Communications Press, 2020. (in Chinese)
[9]	曹宇春, 吴世明, 高广远. 桩基动力检测技术的现状及存在的问题[J]. 上海地质, 2002(81): 43-45. https://www.cnki.com.cn/Article/CJFDTOTAL-SHAD200201015.htm CAO Yuchun, WU Shiming, GAO Guangyuan. Application situation of pile dynamic detections and existed problems[J]. Shanhai Geology, 2002(81): 43-45. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SHAD200201015.htm
[10]	建筑基桩检测技术规范: JGJ 106—2014[S]. 北京: 中国建筑工业出版社, 2014. Technical Code for Testing of Building Foundation Piles: JGJ 106—2014[S]. Beijing: China Architecture and Building Press, 2014. (in Chinese)
[11]	梁超, 刘润. 大直径钢管桩竖向承载力计算方法研究[J]. 地下空间与工程学报, 2018, 14(1): 169-175. https://www.cnki.com.cn/Article/CJFDTOTAL-BASE201801024.htm LIANG Chao, LIU Run. Research on evaluation methods of vertical bearing capacity for large diameter steel pipe pile[J]. Chinese Journal of Underground Space and Engineering, 2018, 14(1): 169-175. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-BASE201801024.htm
[12]	SVINKIN M R. Discussion on setup and relaxation in glacial sand[J]. Journal of Geotechnical Engineering, 1996, 122(4): 319-321.
[13]	LONG J, KERRIGAN J, WYSOCKEY M. Measured time effects for axial capacity of driven piling[J]. Transportation Research Record Journal of the Transportation Research Board, 1999, 1663(1): 8-15.