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Influence of Incomplete Soil Plugs on Bearing Capacities of Bucket Foundations in Clay

China Ocean Engineering 2024年第1期38卷 144-155页

作者： LI Hui-shan LIU Run YANG Xu lian ji-jian State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Institute of Marine Energy and Intelligent Construction Tianjin University of TechnologyTianjin 300384China

Due to the uneven seabed and heaving of soil during pumping,incomplete soil plugs may occur during the installation of bucket foundations,and the impacts on the bearing capacities of bucket foundations need to be *** this paper,the contact ratio(the ratio of the top diameter of the soil plug to the diameter of the bucket)and the soil plug ratio(the ratio of the soil heave height to the skirt height)are defined to describe the shape and size of the incomplete soil ***,finite element models are established to investigate the bearing capacities of bucket foundations with incomplete soil plugs and the influences of the contact ratios,and the soil plug ratios on the bearing capacities are *** results show that the vertical bearing capacity of bucket foundations in homogeneous soil continuously improves with the increase of the contact ***,in normally consolidated soil,the vertical bearing capacity barely changes when the contact ratio is smaller than 0.75,while the bearing capacity suddenly increases when the contact ratio increases to 1 due to the change of failure *** contact ratio hardly affects the horizontal bearing capacity of bucket ***,the moment bearing capacity improves with the increase of the contact ratio for small aspect ratios,but hardly varies with increasing contact ratio for aspect ratios larger than ***,the reduction coefficient method is proposed based on this analysis to calculate the bearing capacities of bucket foundations considering the influence of incomplete soil *** comparison results show that the proposed reduction coefficient method can be used to evaluate the influences of incomplete soil plug on the bearing capacities of bucket foundations.

关键词： bucket foundation incomplete soil plug uniaxial bearing capacity contact ratio soil plug ratio

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Experimental Study on the Sinking and Leveling of A Large-Capacity Offshore Wind Turbine Five-Bucket Foundation in Sand

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China Ocean Engineering 2024年第4期38卷 586-601页

作者： lian ji-jian ZHU Hang GUO Yao-hua WANG Hai-jun YU Tong-shun State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Tianjin University of Technology Tianjin 300384China College of Engineering Ocean University of ChinaQingdao 266100China

As offshore wind farms expand into deeper and farther ocean regions and the unit capacity of offshore wind turbines(OWTs)increases,there is a pressing need for a new foundation structure that can accommodate deep-sea conditions and support large capacities while maintaining economical and *** meet this goal of integrated transportation and one-step installation,a novel five-bucket jacket foundation(FBJF),with its suction installation and leveling methods in sand,has been proposed,analyzed and experimentally ***,seepage failure experiments of the FBJF at various depths were conducted,and a formula for calculating the critical suction of seepage failure suitable for the FBJF in sand was chosen and recommended for use with a range of values for the permeability coefficient ***,through leveling experiments of the FBJF at different depths,the maximum adjustable leveling angle during the sinking process was defined using seepage failure and the adjustable leveling angle of the foundation as control *** leveling control strategies were proposed and ***,an automatic sinking and leveling control system for the FBJF was developed and experimentally verified for feasibility.

关键词： offshore wind turbine(OWT) bucket foundation seepage failure suction installation

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Upper Bound Solution of the Resisting Moment Bearing Capacity of A Composite Bucket Shallow Foundation of An Offshore Wind Turbine in Sand

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China Ocean Engineering 2022年第6期36卷 859-870页

作者： LIU Run LI Tian-liang CHEN Guang-si lian ji-jian State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China

Bearing the large moment that is generated by the wind load that acts on the upper structure of offshore wind turbines is an important feature of their foundations that is different from other offshore structures.A composite bucket shallow foundation(CBSF)has been proposed by Tianjin University to address the soft geological conditions in the offshore regions of China for wind *** CBSF is a new type of foundation and is effective against large *** soil deformation test of a CBSF and the numerical simulation study under the same working conditions are carried out to determine the failure mechanism of a CBSF under moment *** resisting soil compression rateηm is defined as a new empirical parameter that indicates the ability of the soil inside the bucket to resist moment *** upper limit of the resisting moment bearing capacity of the bucket foundation is derived through the upper bound theorem of classical plasticity theory based on the failure *** calculation method is validated by tests of bucket models with different height-diameter ratios in sand under moment loading.

关键词： bucket foundation failure mechanism resisting moment bearing capacity upper bound theorem resisting soil compression rate

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组合三棱柱振子流致振动运动特性分析

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科学技术与工程 2024年第15期24卷 6423-6430页

作者：练继建姚帅吴志川邵楠燕翔王孝群河北工程大学水利水电学院邯郸056038 天津大学水利工程仿真与安全国家重点实验室天津300350 河北工程大学河北省智慧水利重点实验室邯郸056038 天津理工大学海洋能源与智能建设研究院天津300382

以流致振动能量转换系统(flow induced motion energy conversion system,FIMECS)为基础,以截面形式和刚度为变量针对组合三棱柱振子进行试验,评估振幅、频率等指标。试验选取了组合三棱柱振子进行了模型试验,通过改变截面排布形式以及... 详细信息

以流致振动能量转换系统(flow induced motion energy conversion system,FIMECS)为基础,以截面形式和刚度为变量针对组合三棱柱振子进行试验,评估振幅、频率等指标。试验选取了组合三棱柱振子进行了模型试验,通过改变截面排布形式以及系统刚度来研究截面布局、刚度对组合三棱柱振子的影响。该研究旨在探究组合振子流致振动的最佳振动条件,为后续多振子流致振动研究扩展思路。试验结果表明:三种不同排布形式的组合振子,在不同刚度工况下都有较好的振动效果,Ⅰ型和Ⅲ型振子振动随流速变化表现为典型的涡激振动,Ⅰ型排布振子具有最好的振动表现。

关键词：海流能利用流致振动组合三棱柱涡激振动振动响应

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An improved numerical model of ski-jump flood discharge atomization

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Journal of Mountain Science 2022年第5期19卷 1263-1273页

作者： lian ji-jian ZHANG Shu-guang HE Jun-ling State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300350China School of Civil Engineering Tianjin UniversityTianjin 300350China

Atomizing rainfall caused by flood discharge of high dams poses a great threat to the safety of powerhouse and ecological *** an indispensable means,numerical calculation is widely used in the safety design of discharge *** distribution of rainfall intensity is closely related to the trajectory nappe shape,jet trajectory distances,the splashed water droplet diameter and its velocity,and the spatial distribution of downstream nappe *** this paper,an experimental result is used to verify the improved stochastic splash mathematical model under different bucket types and discharge conditions,and the sensitivity of downstream rainfall intensity distribution to the shape of trajectory nappe,discharge flow,spatial distribution of downstream nappe wind,and the corresponding relationship between the droplet diameter and its splashing velocity is *** results show that the calculation accuracy of downstream rainfall intensity distribution is significantly improved when the above factors are taken into *** is found that the bucket type and flood discharge rate play the greatest role in the rainfall intensity distribution,followed by the downstream nappe wind distribution,and finally the corresponding relationship between the diameter and velocity of splash ***,these factors should be considered comprehensively when the rainfall intensity distribution of flood discharge atomization is *** study can help us to understand the influence factors of flood discharge atomization more deeply and predict the distribution of flood discharge atomization rainfall intensity more accurately.

关键词： Flood discharge atomization Rainfall intensity distribution Numerical calculation Sensitivity analysis

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Stability Study on the Bucket Foundation with Multi-Compartment During the Floating-up Process Considering Air Compressibility

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China Ocean Engineering 2023年第6期37卷 975-988页

作者： YE Fang-di lian ji-jian GUO Yao-hua WANG Hai-jun XIAO Tian-run XIONG Dong-zhi YU Tong-shun State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Tianjin University of Technology Tianjin 300384China College of Engineering Ocean University of ChinaQingdao 266100China

In the process of developing offshore wind power towards deeper waters,the advantages of the bucket foundation in terms of integrated construction and economy are becoming increasingly *** contrast to conventional floating bodies,the air-floating bucket foundations can achieve self-floating with the help of the air in the compartment and adjust its buoyancy and stability by controlling the air volume in the *** construction process of the bucket foundation involves the control of air in the compartment,thus making it more difficult to *** after the prefabrication of the bucket foundation,the stability of the bucket foundation at the floating-up stage is particularly *** stability of a multi-compartment bucket foundation during the floating-up process cannot be accurately evaluated as the existing theoretical method of air-floating structures does not adequately consider air *** ensure the safety of the floating-up process,a theoretical method based on the idea of intact stability has been developed to analyze the stability of the air-floating bucket foundations,which will allow accurate calculation of the righting arm for different tilt states and critical air leakage *** the same time,accuracy and feasibility of the proposed theoretical method are verified through indoor model tests and practical operation of the prototype structure during the floating-up *** addition,measures to enhance the stability of the bucket foundation are proposed through sensitivity analysis of influencing factors.

关键词： offshore wind power bucket foundation air-floating structure stability

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李家峡拱坝坝体弹性模量及基岩变形模量的反演

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岩石力学与工程学报 2005年第24期24卷 4466-4471页

作者：刘健练继建天津大学建筑工程学院

根据实际情况建立了李家峡水电站的三维有限元模型以对大坝的工作状态进行安全监控。同时,根据不同工况下坝体实测位移相对值,用改进的BP网络来反演坝体弹性模量和基岩变形模量,可为计算模型提供更准确的参数,对大坝的安全状态做出准确... 详细信息

根据实际情况建立了李家峡水电站的三维有限元模型以对大坝的工作状态进行安全监控。同时,根据不同工况下坝体实测位移相对值,用改进的BP网络来反演坝体弹性模量和基岩变形模量,可为计算模型提供更准确的参数,对大坝的安全状态做出准确评价。所用的方法也为其他物理力学参数的反演提供了有效的思路和方法。

关键词：水利工程拱坝弹性模量变形模量反演 BP神经网络李家峡水电站

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人控调度方案对库区支流水动力和水质的影响机制初探

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天津大学学报 2011年第3期44卷 202-209页

作者：马超练继建天津大学建筑工程学院天津300072

水库蓄水运行后将显著改变库区支流的水动力和水质条件.在这种既定状态,改变枢纽的人控调度方案将产生不同的调度期库区出口断面泄流过程和库水位变动过程,进而产生不同的库区支流水动力条件.水动力条件的改变将对支流水质产生不同影响... 详细信息

水库蓄水运行后将显著改变库区支流的水动力和水质条件.在这种既定状态,改变枢纽的人控调度方案将产生不同的调度期库区出口断面泄流过程和库水位变动过程,进而产生不同的库区支流水动力条件.水动力条件的改变将对支流水质产生不同影响.基于此,以三峡水库为例,结合实测地形资料构建了三峡库区一维水动力和水质模拟模型,并通过模拟详细探讨了三峡枢纽不同人控调度方案对库区支流水动力和水质的影响.香溪河支流模拟结果表明:三峡枢纽的调峰运行方案和三峡水库的蓄放方案可产生"人工潮汐"作用和整个支流范围内的干支流水体交换和掺混,提高支流水体流速,对改善支流水环境有利.

关键词：人控调度方案支流水动力水质影响机制三峡水库香溪河支流

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分段低压输水管系水力振荡的动荷载分析

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水利学报 2006年第2期37卷 218-221,226页

作者：秦亮练继建天津大学建筑工程学院天津300072

本文将结构动力学思想引入到水流振荡问题中分析来,深入探究了非恒定流调节时,分段低压输水系统水面及流量振荡的机理。并应用仿真计算,证明来水过程即为输水系统相应的动荷载。在此基础上结合信号分析理论研究了来水过程对输水系统水... 详细信息

本文将结构动力学思想引入到水流振荡问题中分析来,深入探究了非恒定流调节时,分段低压输水系统水面及流量振荡的机理。并应用仿真计算,证明来水过程即为输水系统相应的动荷载。在此基础上结合信号分析理论研究了来水过程对输水系统水力振荡的影响,采用三角函数方式控制来流,可以实现通过对动荷载的控制来减小输水系统的水力振荡。

关键词：分段低压输水系统水力振荡动荷载信号分析来流控制

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李家峡双排机水电站厂内经济运行研究

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天津大学学报 2006年第5期39卷 523-526页

作者：练继建李辉天津大学建筑工程学院天津300072

以天津大学建筑工程学院确定的李家峡水电站机组的不利工况区为依据,以近几年来该水电站的实际运行经验为参考,在综合考虑机组初始运行状态、机组振动特性、机组出力、下泄流量、水库蓄水量和电网负荷平衡等因素的基础上对李家峡水电站... 详细信息

以天津大学建筑工程学院确定的李家峡水电站机组的不利工况区为依据,以近几年来该水电站的实际运行经验为参考,在综合考虑机组初始运行状态、机组振动特性、机组出力、下泄流量、水库蓄水量和电网负荷平衡等因素的基础上对李家峡水电站的厂内经济运行进行了研究．兼顾机组的运行效率和状态,建立了数学模型,并用改进自适应遗传算法对其进行了求解．运用上述方法,分别以3条特征日负荷曲线为依据对李家峡水电站的厂内运行进行了优化,并得到其负荷分配方案．优化结果使电站的效率和机组的运行状态都得到了显著改善,同时结果可作为李家峡水电站运行人员的操作依据．

关键词：水电站经济运行机组运行状态改进自适应遗传算法

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