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1.
《天津大学学报(英文版)》2015,(4)
A series of model experiments of bucket foundations concerning suction installation and negative pressure consolidation in saturated silt were carried out in a cube steel bin at Tianjin University. The experimental results show that the silt inside the bucket has been strengthened by negative pressure, and the strengthening effect decreases with the increase of the distance from the bucket. A three-dimensional numerical model of the experiments was built by means of finite element software ABAQUS with fluid-solid coupling method. The results show that the bearing capacity of the silt inside the bucket foundation increases significantly at the former stage of negative pressure consolidation, while the increasing trend slows down over time. The rotation centers of the bucket foundation and the inner soil region tend to be closer to each other based on the consolidation. The bearing capacity of the bucket foundation is improved effectively with the increase of soil strength. The effects of negative pressure consolidation on the bearing capacity of bucket foundation were also illustrated by an actual offshore wind power project case. 相似文献
2.
In 2010,the first offshore wind turbine with integrated installation was established in Qidong sea area of Jiangsu Province,China,which led to the implementation phase of one-step-installation technique based on the design and construction of large-scale bucket-top-bearing (LSBTB) bucket foundation.The critical technique of LSBTB bucket foundation included self-floating towing,penetration with adjustment of horizontal levelness,removability and one-step-installation.The process of one-step-installation included the prefabrication of LSBTB bucket foundation in onshore construction base,installation and debugging of wind power,overall water transportation of foundation and wind power system,and installation of foundation and offshore wind turbine on the appointed sea area.The cost of one-step-installation technique was about 5 000 Yuan/kW,which was 30%-50% lower than that of the existing technique.The prefabrication of LSBTB bucket foundation took about two months.During the one-step-installation process,the installation and debugging of wind power and overall water transportation need about one to two days in sea area within 35 m depth.After the proposed technique is industrialized,the cost will be further reduced,and the installation capacity is expected to be up to 500 wind turbines per year. 相似文献
3.
Design of offshore wind power foundation with multi-bucket 总被引：1，自引：0，他引：1
Three- and four-bucket offshore wind power foundations with a new form of force-transferring structure are proposed in this paper, and the integrated finite element model of foundation-soil-transition structure is established by using ABAQUS. The carrying capacity of the proposed foundations is studied under vertical load, horizontal load and bending moment. It can be seen that the vertical bearing capacity of multi-bucket foundation can be roughly estimated by the vertical bearing capacity of single-bucket; the horizontal bearing capacity of the three-bucket foundation scheme is controlled by displacement, while that of the four-bucket foundation scheme is controlled by the internal forces of soils. Moreover, the carrying capacity is provided by the overall structure formed by multi-bucket before soil failure. Compared with the conventional single-bucket foundation, there are mainly tension and pressure that are applied to the multi-bucket foundation, so that the carrying capacity of the foundation can be fully utilized. The probability of soil failure can be well reduced with the proposed multi-bucket foundation, and the stress transmission of force-transferring structure is more consistent through steel beams with variable cross-section. 相似文献
4.
张志俊 《黄冈职业技术学院学报》2012,14(5):92-94
砼框架结构抗震设计中浅基础的设计是众值烈度(多遇烈度)下的弹性基础设计,多遇地震作用均应参与组合,柱根设计内力为众值烈度(多烈度)下处于弹性状态时,最不利组合内力经内力调整设计的延性框架柱根内力,浅基础的设计按弹性基础设计时不需要考虑基础的延性要求,设计计算应遵循地基基础抗震设计原则,满足地基基础抗震设计要求。 相似文献
5.
着重对浆固碎石桩法处理软土地基的机理、施工工艺及地基承载力特征值设计进行了探讨,得到了一些有益的结论,为类似的工程提供了理论依据。同时,结合工程实例对浆固碎石桩法处理软土地基的效果进行了检验,结果表明,经过浆固碎石桩法处理的地基承载力提高系数为2．03,地基的沉降量减少了50％,说明用该法处理软土地基是合理有效的。 相似文献
6.
俞弘林绍良 《福建工程学院学报》2020,(3):223-227
以湖北省某岩溶场地的高层建筑工程为例,对岩溶地区高层建筑桩基础的设计与施工进行了探讨,分析了复杂岩溶地区高层建筑桩基础的设计过程、溶洞的处理方法及桩基施工要点。 经过对比分析表明,冲孔灌注桩适应性强、承载力高,能钻穿溶洞达到稳定持力层,建议作为岩溶地区高层建筑的首选桩基础形式。 相似文献
7.
王杰 《北京工业职业技术学院学报》2013,12(3):42-44
分析了煤炭工业各种复杂工况,介绍了智能超声波物位仪的工作原理,阐述了煤仓料位检测的特殊工况对超声波的影响,提出了合理的设计方法以及特殊的安装要求。实践证明,在安装得当,调试正确的条件下,采用合理设计的智能超声波物位仪能够很好地适应煤炭工业的多种料位检测。 相似文献
8.
介绍了复合地基技术的发展概况，着重论述了一些相关的概念，如复合地基、地基处理、复合桩基、按沉降控制设计的疏桩桩基等。通过受力机理的分析，阐明了设置褥垫层与否及桩与基础连接与否并不是复合地基的必要条件，并提出了今后复合地基的重点研究方向。 相似文献
9.
桩基础在现代建筑工程中得到了广泛的应用，但由于结构工程理念的不断更新和发展，对桩基础的设计和施工提出了更高的要求。通过确定和实施原型观测方案，获得了大量的第一手资料，并对其进行初步的整理分析，客观地揭示了工程建设进程中桩基的工作性状，反映了一些客观规律，为进一步丰富和完善桩基工程理论内涵提供了实践依据。 相似文献
10.
陈向阳 《南通职业大学学报》2013,(3):99-104
以某酒店建筑基坑的监测为例,阐述了基坑监测的必要性;介绍了该工程项目中基坑监测方案的设计及实施,并对监测结果进行了分析和评价。结果表明,对该工程建筑基础的监测能快速、准确地反馈基坑变形信息,正确指导施工,保障了施工安全,因而对类似的基坑工程有一定的参考价值。 相似文献
11.
路堤荷载下混凝土芯水泥土搅拌桩工作特性研究 总被引：1，自引：0，他引：1
研究目的：研究混凝土芯水泥土搅拌桩在路堤荷载下的荷载传递规律和变形控制机理。创新要点：评价路堤荷载下混凝土芯水泥土搅拌桩的地基处理效果,测量混凝土芯的竖向应力变化规律和复合地基桩士荷载分担特点,并分析填土过程中混凝土芯水泥土搅拌桩复合地基的固结规律。研究方法：通过埋设沉降板、分层沉降管、测斜管、土压力盒、孔隙水压力计以及钢筋应力计,在路堤填筑过程中对混凝土芯水泥土搅拌桩复合地基进行了长期现场试验。重要结论：1．混凝土芯水泥土搅拌桩复合地基的总沉降、工后沉降以及深层水平位移控制效果均较好,优于普通水泥土搅拌桩复合地基：2．混凝土芯水泥土搅拌桩复合地基的桩土应力比以及荷载分担比均大于普通水泥土搅拌桩复合地基,能有效减小土体表面的荷载量,对于控制沉降有一定的效果。3．在路堤这种柔性荷载作用下,混凝土芯水泥土搅拌桩上部会出现一定的负摩擦阻力,存在一个“中性点”。4．混凝土芯水泥土搅拌桩复合地基的固结速率较快,能有效控制由于丰崮结引起的长期沉降。 相似文献
12.
根据评价相对有效性的DEA方法和《中国船舶工业年鉴》的统计指标,构建了省际海洋工程装备产业的评价指标体系,设计了三套评价指标组合,用于评价平台类产品生产的相对效率、科技研发的相对效率、相关产业的相对影响力。收集指标数据,并利用DEA方法中的C^2R模型和BC^2模型对有关省份进行实例分析,进而探讨了评价结果参数在有关省份海洋工程装备产业发展问题分析与发展对策研究中的应用。 相似文献
13.
桩承土工织物加筋地基的研究与工程应用综述 总被引：5，自引：0，他引：5
当软弱土层上要建设构筑物时，岩土工程师们常常必须解决地基承载力、沉降、差异沉降、稳定及侧向位移的难题，传统单一型式的复合地基往往不能满足要求，而桩承土工织物加筋联合复合地基可以很好地应用于工程实际以解决这些难题。章对桩承土工织物加筋复合地基分发展过程、工程应用、计算方法及目前存在的问题等几方面进行综述，指出目前桩承土工织物加筋复合地基的作用机理、承载力和沉降设计计算理论尚未有深入的研究；及工后沉降的预测和控制也尚未有人研究过。 相似文献
14.
潘宜兴 《宜宾师范高等专科学校学报》2014,(5):29-33
我国非公募基金会得到国家政策的扶持,企业、社会和个人社会责任感增强,给非公募基金会的发展带来了机遇,发展呈“井喷”之势。非公募基金会募捐渠道狭小,对地区经济依赖性强,使东西部地区的非公募基金会发展不平衡;且非公募基金会较公募基金会专业化程度低,信息不透明,无法满足人们日益增长的公益需求。非公募基金会改革应主要从两方面进行：完善内容治理和信息公开制度,从而提高基金的社会公信力;提高专业化运作,改变保守求稳的理财观念,实现基金的增值。 相似文献
15.
主要探讨玻璃生产线热端设备安装前对现场设备基础的质量检测及处理,阐明了现场测量的相关要求,并总结出土建设计中应该明确的具体技术要求。 相似文献
16.
吴梓瑞 《河北能源职业技术学院学报》2010,10(4):68-69,72
对山区不良地基的成因和影响等进行了分析,阐述了山区不良地基的处理措施,并根据工程实践提出了具体的建议和相应的设计方案,消除了建筑物的地基隐患,为以后山区工程建设处理不良地基积累了成功经验。 相似文献
17.
结合相关设计规范,阐述住宅漏电保护器的设计,包括漏电保护器的设置安装、漏电断路器的额定动作电流值的合理整定、优先选用电磁式漏电断路器、室内空调电源支路宜装设漏电保护器、电涌保护装置和漏电断路器安装位置的确定,以及住宅等电位联结等。 相似文献
18.
Numerical Analysis of Soil Plug Inside Suction Foundations During Suction Penetration by Discrete Element Method 总被引：2，自引：1，他引：2
The phenomenon of the soil plug usually rising inside the suction foundations during suction penetration was quantitatively described and predicted. The formation process of the soil plug was simulated and calculated by DEM （discrete element method） model. The seepage flow, the self-weight of soil, the friction on the chamber wall as well as the suction inside the chamber are considered as the main external forces in the process. The results are compared with a set of laboratory model tests performed by using three soil types （sand, silty clay and clay） in the Bohai Sea area. The heights of soil plug from numerical estimations are lower than those from model test results, mainly because the suction pressure and friction resistance are applied in an ideal way under the numerical simulation. 相似文献
19.
黎艺华 《柳州职业技术学院学报》2012,12(3):48-51
利用丰富的太阳能资源来解决边远无电地区用电问题是非常有效的途径之一。介绍了针对边远无电地区农牧民、海上岛屿、船舶、河流船只、山区林场等家庭及单位的太阳能户用电源系统设计方法和应用实例。 相似文献
20.
The buckle and collapse of offshore pipeline subjected to combined actions of tension, bending, and external pressure during
deepwater installation has drawn a great deal of attention. Extended from the model initially proposed by Kyriakides and his
co-workers, a 2D theoretical model which can successfully account for the case of simultaneous tension, bending, and external
pressure is further developed. To confirm the accuracy of this theoretical method, numerical simulations are conducted using
a 3D finite element model within the framework of ABAQUS. Excellent agreement between the results validates the effectiveness
of this theoretical method. The model is then used to study the effects of several important factors such as load path, material
properties, and diameter-to-thickness ratio, etc., on buckling behaviors of the pipes. Based upon parametric studies, a few
significant conclusions are drawn, which aims to provide the design guidelines for deepwater pipeline with solid theoretical
basis. 相似文献