为提高海上光伏建设安装效率同时降低施工作业时间和成本,提出自沉/吸贯式近海新型固定式光伏一体化结构。针对中国典型层状海床地基,开展模型试验研究海洋光伏一体化结构沉贯安装特性。试验研究表明在相同沉贯深度下,一体化结构比单桶吸力基础在吸力沉贯完成后产生的土塞高度更高,当一体化结构穿过上层黏土层,刺入下层砂土层时,一体化结构沉贯效果更加显著,吸力值变化幅度比单桶吸力基础沉贯增大320%,同时该砂土层存在明显的“渗流减阻”效应,且在“渗流减阻”效应下,一体化结构在重力和吸力的共同作用下易发生类似于“溜桩”效应,而单桶吸力基础沉贯试验中并未出现“溜桩”效应,表明一体化结构沉贯过程需要考虑“溜桩”风险。提出分层土中考虑渗流减阻作用的沉贯阻力及吸力修正公式。试验得到的最大吸力较理论修正公式计算的最大吸力值减小约7.4%,理论分析计算方法与模型试验结果吻合度较高。
Abstract
In order to enhance the efficiency of offshore photovoltaic construction and installation while minimizing time and cost, a novel “self-sinking/suction-penetration near-shore fixed photovoltaic integrated structure” was proposed. Model experiments were conducted to investigate the installation characteristics of the offshore photovoltaic integrated structure on typical layered seabed foundations in China. The experimental findings demonstrate that, at identical penetration depths, the integrated structure yields a greater soil plug height following suction penetration compared to a single suction caisson. As the integrated structure penetrates the upper clay layer and punctures the lower sand layer, the penetration effect becomes more pronounced, resulting in a 320% increase in suction force compared to the single suction caisson. Moreover, a discernible “seepage reduction” effect is observed in the sand layer. Under this effect, the integrated structure is susceptible to a “pile running” phenomenon due to the combined influence of gravity and suction. However, the “pile running” phenomenon was not observed during the single suction caisson penetration test, indicating the need to consider the “pile running” risk in the penetration process of integrated structure. A modified formula for penetration resistance and suction, accounting for the seepage resistance in layered soil, was proposed. The experimental results show that the maximum suction obtained is approximately 7.4% lower than the maximum suction calculated using the theoretical modified formula. The theoretical analysis method exhibits a high degree of agreement with the results of the model test.
关键词
海洋光伏 /
一体化结构 /
分层土 /
沉贯阻力 /
沉贯吸力 /
渗流减阻作用
Key words
offshore photovoltaic /
integrated structure /
layered soil /
penetration resistance /
penetration suction /
seepage reduction effect
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参考文献
[1] GORJIAN S, EBADI H, CALISE F, et al.A review on recent advancements in performance enhancement techniques for low-temperature solar collectors[J]. Energy conversion and management, 2020, 222: 113246.
[2] WANG R Z, ZHAI X Q.Development of solar thermal technologies in China[J]. Energy, 2010, 35(11): 4407-4416.
[3] WANG Z W, CARRIVEAU R, TING D S K, et al. A review of marine renewable energy storage[J]. International journal of energy research, 2019, 43(12): 6108-6150.
[4] TRAPANI K, MILLAR D L, SMITH H C M. Novel offshore application of photovoltaics in comparison to conventional marine renewable energy technologies[J]. Renewable energy, 2013, 50: 879-888.
[5] 海上光伏应用前景分析及技术标准评估分析[EB/OL]. https://tuvnord.contentour.com/video/VContentSet/nc_columnlist.html?cid=2771&ctype=2&first_id=206&second_id=175&managerid=0&inviter=.
Offshore photovoltaic application prospect analysis and technical standard evaluation analysis.[EB/OL].https://tuvnord.contentour.com/video/VContentSet/nc_columnlist.html?cid=2771&ctype=2&first_id=206&second_id=175&managerid=0&inviter=.
[6] 李大勇, 张雨坤, 张永飞, 等. 一种海上固定式抗浮冰光伏电站一体化结构及安装方法: CN115743440A[P].2023-03-07.
LI D Y, ZHANG Y K, ZHANG Y F, et al. An offshore fixed anti-floating ice integrated photovoltaic power station and installation method: CN115743440A[P].2023-03-07.
[7] ANDERSEN K H, JOSTAD H P, DYVIK R.Penetration resistance of offshore skirted foundations and anchors in dense sand[J]. Journal of geotechnical and geoenvironmental engineering, 2008, 134(1): 106-116.
[8] MEHRAVAR M, HARIRECHE O, FARAMARZI A.Geotechnical performance of suction caisson installation in multi-layered seabed profiles[M]//Springer Series in Geomechanics and Geoengineering. Cham: Springer International Publishing, 2018: 467-474.
[9] TRAN M N, RANDOLPH M F, AIREY D W.Installation of suction caissons in sand with silt layers[J]. Journal of geotechnical and geoenvironmental engineering, 2007, 133(10): 1183-1191.
[10] 张鸿, 金书成, 黎冰, 等. 海上风电吸力式沉箱基础沉贯试验研究[J]. 太阳能学报, 2016, 37(11): 2827-2834.
ZHANG H, JIN S C, LI B, et al.Tests on installation of suction of offshore wind turbine[J]. Acta energiae solaris sinica, 2016, 37(11): 2827-2834.
[11] 张雨坤, 秦廷辉, 李大勇, 等. 分层土中裙式吸力基础吸力沉贯特性模型试验研究[J]. 岩土力学, 2022, 43(5): 1317-1325.
ZHANG Y K, QIN T H, LI D Y, et al.Model tests on installation behavior of modified suction caissons in layered soil[J]. Rock and soil mechanics, 2022, 43(5): 1317-1325.
[12] 沈侃敏, 王宽君, 单治钢, 等. 吸力式桶形基础负压安装的渗流侵蚀过程研究[J]. 太阳能学报, 2022, 43(4): 380-386.
SHEN K M, WANG K J, SHAN Z G, et al.Seepage induced erosion process of suction bucket foundations installation under negative pressure[J]. Acta energiae solaris sinica, 2022, 43(4): 380-386.
[13] 李大勇, 吴宇旗, 张雨坤, 等. 砂土中桶形基础吸力值的设定范围[J]. 岩土力学, 2017, 38(4): 985-992, 1002.
LI D Y, WU Y Q, ZHANG Y K, et al.Determination of suction range for penetration of suction caissons in sand[J]. Rock and soil mechanics, 2017, 38(4): 985-992, 1002.
[14] 杨少丽, 李安龙, 齐剑峰. 桶基负压沉贯过程模型试验研究[J]. 岩土工程学报, 2003, 25(2): 236-238.
YANG S L, LI A L, QI J F.Experimental study on bucket foundation during penetration by suction[J]. Chinese journal of geotechnical engineering, 2003, 25(2): 236-238.
[15] 朱斌, 孔德琼, 童建国, 等. 粉土中吸力式桶形基础沉贯及抗拔特性试验研究[J]. 岩土工程学报, 2011, 33(7): 1045-1053.
ZHU B, KONG D Q, TONG J G, et al.Model tests on penetration and pullout of suction caissons in silt[J]. Chinese journal of geotechnical engineering, 2011, 33(7): 1045-1053.
[16] HOULSBY G T, BYRNE B W.Design procedures for installation of suction caissons in sand[J]. Geotechnical engineering, 2005, 158(3): 135-144.
[17] HOULSBY G T, BYRNE B W.Design procedures for installation of suction caissons in clay and other materials[J]. Proceedings of the institution of civil engineers- geotechnical engineering, 2005, 158(2): 75-82.
[18] 李大勇, 桑志远, 张雨坤. 分层土中吸力基础沉贯吸力变化及土体变形规律试验研究[J]. 土木工程学报, 2023, 56(2): 69-79.
LI D Y, SANG Z Y, ZHANG Y K.Experimental study on suction variation and soil deformation behavior in layered soil during penetrating of suction caisson[J]. China civil engineering journal, 2023, 56(2): 69-79.
基金
国家自然科学基金（52371301）; 山东省高等学校青年创新团队支持计划
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