海上风电场吸力筒基础沉贯特性研究

王卫; 刘俊峰; 李亚静; 倪道俊; 滕华灯; 黄绍幸

doi:10.11779/CJGE20221397

海上风电场吸力筒基础沉贯特性研究 English Version

1.
中国长江三峡集团有限公司科学技术研究院, 北京 100038
2.
三峡新能源阳江发电有限公司, 广东阳江 529500
3.
中国三峡新能源(集团)股份有限公司, 北京 100053

基金项目:

国家自然科学基金项目 52209171

中国长江三峡集团有限公司科研项目 WWKY-2020-0179

详细信息

作者简介:
王卫(1992—)，男，博士，高级工程师，主要从事海上风电机组支撑结构与胶结抛石防冲刷技术研究工作。E-mail: wangwei16@tsinghua.org.cn

中图分类号: TU432
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出版历程
- 收稿日期: 2022-10-31
- 网络出版日期: 2024-03-14
- 刊出日期: 2024-02-29

Penetration behavior of suction bucket foundations in an offshore wind farm

1.
Institute of Science and Technology, China Three Gorges Corporation, Beijing 100038, China
2.
Three Gorges Renewables Yangjiang Power Co., Ltd., Yangjiang 529500, China
3.
China Three Gorges Renewables (Group) Co., Ltd., Beijing 100053, China

摘要

摘要: 吸力筒沉贯特性是影响其工程应用的重要因素。基于海上风电场吸力筒导管架基础筒体下沉过程的实测数据，研究真实海床地基条件下吸力筒沉贯阻力的CPT计算方法的可行性以及DNV规范推荐的土体沉贯阻力的经验系数的适用性，分析黏土层和砂土层中沉贯阻力的组成和负压下沉过程中的筒内土塞机制。研究结果表明：CPT计算方法能够较精确地计算吸力筒沉贯阻力，DNV规范推荐的经验系数高估了海床地基中淤泥质土、粉质黏土层的黏土经验系数 ${k_{\text{f}}}(z)$ 以及砂砾、中砂、粗砂层等砂土经验系数 ${k_{\text{p}}}(z)$ ；负压下沉过程中，筒内土塞体积的发展规律与海床土层分布及土体物理力学性质密切相关。
- 海上风电 /
- 吸力筒基础 /
- 沉贯特性 /
- 土塞
Abstract: The penetration behavior of suction bucket foundations has a significant effect on engineering application. Based on the measured installation data of two suction bucket jacket foundations in an offshore wind farm, the CPT-based method used for calculating the penetration resistance in seabed and the two critical empirical factors, ${k_{\text{p}}}(z)$ and ${k_{\text{f}}}(z)$ , recommended by the DNV code are studied. The component of penetration resistance of suction bucket in clay soil layer and sand soil layer, respectively, and the soil plug during suction penetration process are analyzed. The results show that the penetration resistance of suction bucket can be precisely predicted by the CPT-based method. The empirical factor ${k_{\text{f}}}(z)$ for silty soil, silty clay soil and the empirical factor ${k_{\text{p}}}(z)$ for grit sand, medium-dense sand and coarse sand are overestimated by the DNV code. During suction penetration process, the soil plug of suction bucket foundations relies on the seabed soil layers and mechanical properties of soils.
- offshore wind power /
- suction bucket foundation /
- penetration behavior /
- soil plug

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图 1 吸力筒导管架基础

Figure 1. Photo of suction bucket jacket foundation

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图 2 吸力筒导管架基础机位点地勘点布设示意图

Figure 2. Plane arrangement of two suction bucket jacket foundations

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图 3 吸力筒导管架基础机位点地层分布

Figure 3. Soil layers at sites of two suction bucket jacket foundations

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图 4 机位点CPT勘测数据

Figure 4. CPT cone resistance at locations of suction bucket jacket foundations

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图 5 负压下沉过程的实测沉贯阻力

Figure 5. Measured penetration resistances with depth

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图 6 负压下沉过程的沉贯阻力经验系数的影响

Figure 6. Effect of two empirical factors on penetration resistance

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图 7 负压下沉过程的沉贯阻力组成

Figure 7. Composition of penetration resistance

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图 8 土塞体积随沉贯时间的变化曲线

Figure 8. Variation of volume of soil plug with penetration time

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表 1 吸力筒设计参数

Table 1 Parameters of suction buckets

设计参数	筒体外径/m	筒体长度/m	沉贯深度/m	预留间隙/m	筒体壁厚/mm	筒体数量/个	筒体间距/m	筒体重量/t	筒体承受荷载/kN
^#1	13	10.6	10.1	0.5	45	3	30	241.6	2029.58
^#2	12.3	11.3	10.8	0.5	40	3	30	218.7	2052.12

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表 2 CPT方法经验系数

Table 2 Empirical factors for CPT method factors

来源	工况	黏土		砂土
来源	工况	${k_{\text{p}}}(z)$	${k_{\text{f}}}(z)$	${k_{\text{p}}}(z)$	${k_{\text{f}}}(z)$
DNV	MP	0.4	0.03	0.3	0.001
DNV	HE	0.6	0.05	0.6	0.003
SPT	ME	0.6	0.05	0.45	0.002
Andersen^[5]	MP	—	—	0.01~0.55	0.001
Andersen^[5]	ME	—	—	0.03~0.6	0.0015
Chen等^[20]	—	—	—	0.35	0.0018
注：MP和HE分别为DNV规范推荐的最大可能性和最高预期的经验系数，ME为SPT公司推荐的最高预期的经验系数。

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表 3 自重入泥深度预测值

Table 3 Predicted values of self-weight penetration depth

吸力筒	下沉深度/m
吸力筒	MP	ME
^#1	6.03	4.63
^#2	5.89	5.18

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表 4 负压沉贯阻力预测值

Table 4 Predicted values of penetration resistance

吸力筒	沉贯阻力（负压）/kPa
吸力筒	MP	ME
^#1	48	99
^#2	78	155

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表 5 吸力筒实测沉贯结果

Table 5 Measured results of penetration process of suction buckets

吸力筒		自重下沉深度/m	沉贯总深度/m	最大负压值/kPa
^#1	B筒	5.7	9.67	140
^#2	B筒	3.5	10.8	70

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表 6 ^#1机位点土体经验系数取值

Empirical factors of ${k_{\text{p}}}(z)$ and ${k_{\text{f}}}(z)$ for location ^#1

土层	顶高	底高	T1		T2		T3
土层	顶高	底高	m	n	m	n	m	n
淤泥质土	-5.7	-8.77	1	1	1	0.8	1	0.9
中砂	-8.77	-11.0	0.5	1	0.5	1	0.5	1

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表 7 ^#2机位点土体经验系数取值

Empirical factors of ${k_{\text{p}}}(z)$ and ${k_{\text{f}}}(z)$ for location ^#2

土层	顶高	底高	T1		T2		T3
土层	顶高	底高	m	n	m	n	m	n
砂砾	-3.5	-4.9	0.6	1.5	0.6	1.5	0.6	1.5
粉质黏土	-4.9	-10.9	1	1	1	0.5	1	0.3
粗砂	-10.9	-11.5	0.6	1.5	0.6	1.5	0.6	1.5

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