深圳抽水蓄能电站引水系统灌浆质量控制与分析

抽水蓄能电站引水系统灌浆质量控制,决定了水道系统渗水量的大小,关系到电站长期运行的经济指标及水道安全。详细介绍了深圳抽水蓄能电站灌浆参数的设计和灌浆中采取的管理措施与技术措施,分析了灌浆检测成果。电站投入运行以来,引水系统结构稳定,无渗漏。通过总结深圳抽水蓄能电站灌浆过程,对水道引水系统灌浆质量控制提出了几点建议,可供类似工程借鉴。     

向家坝二纵围堰柔性结构段基础施工技术初探

向家坝水电站二期纵向围堰上游段座落于厚达45～62 m的覆盖层上，为提高接头段深厚覆盖层地基承载力，且保证导流期不同江水位时的堰体稳定，优化调整方案为，将接头段和导水段改为柔性结构。详细介绍了柔性结构段基础处理中所涉及的施工程序、施工技术和异常情况处理等。二纵围堰经过了2009年和2010年两个汛期的考验，安全监测显示与实际运行表明，柔性结构体结构稳定。将导水结构堰体改为柔性结构体，不仅节约了投资，而且保证了二期截流工程按施工总进度计划实施。     

Engineering accidents in society: A comparison of Chinese and American railway accident investigation

Based on the investigation reports for two major railway accidents in China and the USA, as well as the analysis of related systems, this paper compares the differences between Chinese and American railway accident investigation modes along different dimensions. The four aspects attended to are the investigation purpose, institutional basis, scope and process, and type of conclusion. The results reveal the role of social factors in shaping the investigation pattern of engineering accidents, and show engineering accidents can serve as a window to understanding a society and the ways that learning from engineering accidents is a socially institutionalized process. A final discussion considers possible improvements that might be introduced into the Chinese mode of engineering accident investigation.     

Geopolymer concrete-filled pultruded composite beams – Concrete mix design and application

The limited research on the geopolymer concrete mix design for targeting a specific strength is identified an obstacle for their effective design and wide use. In this paper, a mix design procedure has been proposed for fly-ash based geopolymer concrete and its use as infill hybrid composite beam is investigated. Then, the structural performance of geopolymer concrete filled hybrid composite beam is investigated to determine their possible application in civil infrastructure. Firstly, a detailed procedure of mix design for fly-ash based geopolymer concrete is presented. Secondly, three hybrid beams filled with geopolymer concrete were prepared and tested in a four-point bending setup to evaluate their flexural modulus and modulus of rupture. Numerical and analytical evaluation of the behaviour of hybrid beam were performed and results showed a good agreement with the experimental investigation. Thirdly, the suitability of the beam for a composite railway sleeper is evaluated and compared with existing timber and composite sleepers. Finally, the beams’ performance in a ballast railway track is analysed using Strand7 finite element simulation software and the results showed that the new concept of using geopolymer concrete as infill to pultruded composite section satisfied the stiffness and strength requirements for a railway sleeper.     

仙游抽水蓄能电站尾水系统充排水试验

为检查工程质量,查找输水系统可能存在的问题并消除隐患,保障电站安全运行,福建仙游抽水蓄能电站在投产发电前,要对输水发电系统进行充水试验与放空排水试验,在试验过程中监测输水系统的应力、应变与渗漏水情况。本文以尾水系统为例,介绍了试验所应具备的工程条件、工作程序及技术要求、试验成果分析和存在问题处理等。试验表明,仙游抽水蓄能电站尾水系统设计合理,施工质量优良,结构可靠,可供同类工程参考与借鉴。     

白鹤滩出线竖井GIL方案

白鹤滩水电站出线竖井内布置了世界上最高垂直敷设的500 kV GIL,设计、施工难度大。对白鹤滩水电站出线竖井内GIL布置和安装检修方案的拟定,以及在方案拟定过程中所考虑的主要因素进行了详细介绍,为白鹤滩水电站500 kV GIL顺利实施提供了技术支撑。     

高速铁路绝缘块耐环境能力的研究

铁路扣件系统是将钢轨固定在轨枕上,阻止钢轨相对于轨枕发生横纵向移动,保持轨距,在高速铁路运行过程中起到缓冲减震作用的系统。经过长期使用及列车的运行,有些尼龙产品扣件存在不同程度的损坏,产生松动现象,进而影响铁路运行安全。以扣件系统中的绝缘轨距块为研究对象,从环境及气候等多种因素研究其对轨距块性能的影响,找寻较为关键的影响因素。研究结果发现,室外环境放置的轨距块极限剪切性能下降更明显,耐冲击性更差。经过研究不同恶劣环境下轨距块性能的变化,发现高温高湿及高温环境下产品性能下降幅度较大,其中高温高湿影响最大。     

深圳抽水蓄能电厂球阀动水关闭试验研究

为验证深圳抽水蓄能电厂球阀具备动水关闭能力且不会产生有害振动进行了球阀动水关闭试验,获得不同负荷下球阀动水关闭实测各项动应力值及振动位移值。试验数据表明深蓄电厂球阀在不关闭导叶情况下能可靠关闭阻断上游来水,验证了在100%负荷动水关闭球阀最不利工况下,球阀混凝土支墩结构强度满足设计要求,球阀体系的振动位移是安全的,且对设备未产生有害变形及损坏。