大伙房长距离输水工程SCADA系统设计

大伙房水库输水二期工程自大伙房水库引水,通过隧洞和管道,采取封闭供水方式,向抚顺等6个城市供水,系统运行工况复杂,控制要求高.为实现工程全线设备的自动监测与控制,保证系统技术先进、运行稳定可靠,从计算机数据采集与监控(SCADA)系统的实现目标与功能、系统总体结构及主要设备配置、系统冗余策略、系统控制策略及方式、系统通信等方面进行了分析设计.系统建成后将为大伙房水库输水工程运行管理提供安全可靠、科学经济的技术手段.     

大伙房输水工程实验平台系统设计

本文所述实验平台基于AB公司的Control Logix系列PLC设计,采用全冗余配置,模拟原大伙房SCADA系统,实现了其基本功能,是工程运行维护人员培训与实践的重要工具,对保障大伙房输水工程SCADA系统稳定运行具有重要作用。     

TBM施工通风方案设计

目前,随着中国经济的发展,长距离输水工程在国内越来越多,有时受地形控制,不可避免出现长距离隧洞,通风成为工程中的技术难题。文章就大伙房水库输水工程长距离隧洞的通风设计做一介绍。     

无线网桥在长距离引水工程中的应用

针对长距离引水工程通信网络的构成特点,阐述了无线网桥构建长距离引水工程无线通信网络的技术要点和优势。结合大伙房引水工程中无线网桥的应用实例,介绍了无线网桥在长距离引水工程无线通信网络构建过程中的设计、安装、调试方法。     

双向调压塔在长距离密闭输水管线中的应用

调压塔调控是长距离输水管道水锤防护最有效、最直接的手段。本文通过大伙房水库输水二期工程干线双向调压塔的运行实践,分析了在典型工况下调压塔超压溢流和负压补水的平压调控特性,认为双向调压塔在长距离、密闭有压输水管线系统中的应用是安全可靠的,可供类似工程参考。     

三维仿真系统在大伙房输配水 工程中的应用

大伙房输配水工程三维仿真系统是在工程运行调度工况特别复杂的背景下建立的,其构架核心是SymLinkNJ14仿真数据库系统软件和PMC64仿真软件。本文通过阐述该三维仿真系统在大伙房输配水过程中成功的应用经验,为后续的长距离管道输水工程及跨流域水资源调配工程的仿真系统建设提供参考。     

大型输水工程PCCP管道阴极保护浅析

长距离输水工程PCCP管道防腐措施得当是工程安全运行及长期使用的重要保证。本文重点介绍了管道防腐中最常用也是最重要的措施——阴极保护在大伙房水库输水工程中的应用。     

辽宁省大伙房水库输水工程建设必要性浅析

大伙房水库输水工程是利用输水隧洞把浑江多余的水量调剂到浑河的大伙房水库,然后经大伙房水库调节后供给辽宁中部缺水较多的六个城市。文章以大伙房水库输水工程为例,分析了工程建设的必要性,提出了优化调度方案,为类似工程施工提供参考。     

跨流域调水方式的分析与比选

大伙房水库输水工程引水部分涉及多座水库与长距离输水隧洞,形成了复杂的引水调度系统。本文结合工程实际,提出均匀引水和集中引水两种方式,并通过计算,对两种方式在工程运行不同时期的优劣进行分析。     

辽宁润中供水有限责任公司 抓文明单位创建 促安全优质供水

正辽宁中南部七市工业和居民生活用水总量的一半来自大伙房水库输水工程,保障工程供水安全是辽宁润中供水有限责任公司的重要使命。辽宁润中供水有限责任公司(以下简称润中公司)组建于2002年初,隶属于辽宁省水资源管理集团有限责任公司,主要负责大伙房水库输水工     

地下厂房施工过程的三维非线性数值模拟分析

根据冗各电站地下厂房开挖支护的施工顺序,以隐式杆单元模拟锚杆,以壳单元模拟混凝土喷层,采用三维非线性有限元技术,对洞室群的开挖支护动态过程进行了模拟计算。通过三维非线性有限元计算分析得到:洞室群动态开挖过程中围岩应力变形的分布规律,围岩塑性区的发展规律,锚杆受力变化情况。计算结果表明:整个开挖过程中,洞周围岩位移变化规律正常,量值较小,塑性区主要分布在洞室周边,围岩稳定性较好;但在洞室交叉口处围岩的变形较大,出现较大范围的塑性区,在此基础上提出了支护措施优化方案,并对优化方案的效果进行了评价。     

Evaluation of freshwater mussel relocation as a conservation and management strategy

The relocation of unionacean mussels is commonly used as a conservation and management tool in large rivers and streams. Relocation has been used to recolonize areas where mussel populations have been eliminated by prior pollution events, to remove mussels from construction zones and to re-establish populations of endangered species. More recently, relocation has been used to protect native freshwater mussels from colonization by the exotic zebra mussel Dreissena polymorpha. We conducted a literature review of mussel relocations and evaluated their relative success as a conservation and management strategy. We found that 43% of all relocations were conducted because of construction projects that were forced to comply with the Endangered Species Act 1973 and that only 16% were monitored for five or more consecutive years. Most (43%) relocation projects were conducted from July to September, presumably a period when reproductive stress is relatively low for most species and the metabolic rate is sufficient for reburrowing in the substrate. The mortality of relocated mussels was unreported in 27% of projects; reported mortality varied widely among projects and species and was difficult to assess. The mean mortality of relocated mussels was 49% based on an average recovery rate of 43%. There is little guidance on the methods for relocation or for monitoring the subsequent long-term status of relocated mussels. Based on this evaluation, research is needed to develop criteria for selecting a suitable relocation site and to establish appropriate methods and guidelines for conducting relocation projects.     

基于模型试验的河床砂砾石层基本特性研究

为了经济可靠地确定深厚覆盖层的基本特性参数,以大渡河双江口水电站坝基河床砂砾石层基本特性研究为工程背景,进行大尺寸模型试验,研究河床砂砾石层的旁压模量和动探击数随密度、级配以及上覆压力的变化规律。根据室内模型试验结果,结合现场旁压试验及钻孔试验成果,推断出坝址区河床砂砾石相关层位的密度,并依此进行砂砾石室内力学试验,获得设计所需力学参数。研究成果可为深厚覆盖层基本特性测试提供新的方法。     

基于BP神经网络-马尔科夫链模型的隧道围岩位移预测

在隧道工程施工中,围岩位移预测起着很重要的作用。将BP神经网络-马尔科夫链模型引入到隧道围岩位移预测中来,通过对训练样本的学习,利用BP神经网络实现了对位移时间序列的滚动预测,同时得到了实测值与预测值的相对误差;在此基础上利用马尔科夫链对相对误差进行修正,有效地提高了预测结果的精度。并将该模型应用于某公路隧道拱顶下沉位移时序预测中,结果表明该模型具有精度高、科学可靠的特点,为隧道围岩变形的预测提供了新的途径。     

Short communication. Pipelines as a refuge for freshwater snails

In the lower River Murray, Australia, populations of gastropods have declined markedly over the past 40 years. Of the native fauna of about 18 species, only the ancylid Ferrissia petterdi remains common (but in patches), and another five species feature in sporadic local resurgences. Until recently the viviparid Notopala was thought to be extinct. The introduced physid Physa acuta is widespread, but in low numbers. The decline probably is associated with flow regulation, high turbidity and the introduction of common carp. Snail populations have persisted, however, in irrigation pipelines fed from the river, where they periodically cause blockages. This paper reports the discovery of the only known populaion of Notopala hanleyi in a pipeline where the inner wall accumulates microbial and other organic matter, providing high quality food for snails. In the Murray before regulation most of the periphytic biomass was probably microbial, as fluctuating water levels would have maintained littoral communities in a highly productive, early state of succession his postulated that, by stabilizing seasonal water levels, regulation has promoted the production of filamentous green algae, an inferior food source, and so displaced snail populations from the open aquatic environment.     

浙江省水域调查录入系统的设计和应用

浙江省水域调查录入系统将调查数据与电子地图相整合,对分类水域数据进行统计计算,并对输入数据进行合理性和完整性检查,得到调查范围内现有水域的详细数据,实现了水域调查数据输入、计算、统计和查询的数字化管理,提高了工作效率和工作质量,为各地下阶段水域保护规划编制和水域管理工作提供了数据支持。对该系统的设计原则、功能和技术设计等作了介绍。     

基于CT-连续加荷水泥乳化沥青混凝土细观损伤规律研究

利用CT技术对水泥乳化沥青混凝土的细观损伤过程进行实时扫描观测,获得了混凝土试件在连续加荷下的CT图像。通过采用直观分析法、CT数分析法、CT数与损伤变量关系3种方法分析表明,水泥乳化沥青混凝土的破坏过程可分为压密、扩容、裂纹扩展、破坏4个阶段,同时混凝土在受压过程中具有韧性,在极限荷载之前各断面处于压密和微扩容的强化阶段,极限荷载之后混凝土从损伤到破坏发展比较平稳。     

Automated system for removal and pneumatic transport of fly ash from electric precipitator hoppers

A system for removal and pneumatic transport of fly ash is examined, in which air pulses act on batches (pistons) of ash formed in a duct. Studies are made of the effect of several physical parameters on the force required to displace a piston of ash and these serve as a basis for choosing a system for removal and pneumatic transport of ash simultaneously from several hoppers of an electric precipitator. This makes it possible to separate the ash particles according to size without introducing additional components. Formulas are given for calculating the structural and dynamic parameters of this system and measurements of indirect dynamic parameters are used to calculate the input-output characteristics of the system. In order to optimize the system, configurations for summing several ducts into a single transport duct for pneumatic ash transport are proposed. Some variants of dry ash utilization and the advantages of producing of size-separated particles are considered. __________ Translated from élektricheskie Stantsii, No. 2, pp. 26–30 (2008).     

The flood pulse advantage and the restoration of river-floodplain systems

The ‘flood pulse advantage’ is the amount by which fish yield per unit mean water area is increased by a natural, predictable flood pulse. Evidence for this increase is presented from tropical and temperate fisheries. It is argued that increasing multispecies fish yield by restoring the natural hydrological regime is consistent with increasing production of other trophic levels and with restoration from ecological and aesthetic viewpoints. When applied to a river-floodplain system, this restoration would provide a large, self-sustaining potential for recreation, commercial exploitation, and flood control. An interim ‘natural flood pulse’ restoration approach is proposed for systems modified for navigation. This approach approximates the natural hydrological regime in a river reach and is intended as a first step in the long process of restoring the watershed.     

浅谈天湖水电站水轮机运行故障及处理措施

简述天湖水电站投运以来各种故障的表现形式，分析其原因，提出了相应的处理方法及措施，并对合理利用国内外设备提出建议。