项目管理承包PMC模式研究

尽管PMC是工程项目建设的一种主要合同模式,理论界仍然缺少对PMC的研究。从我国工程总承包的发展历程中梳理出PMC的发展路径,从业主角度分析PMC模式的优势。进一步,通过调研分析PMC在水利项目建设中的推广要因,最后指出在我国现行法律和政策环境下推广PMC的若干课题。     

浅谈PMC项目管理在水利工程中的应用

在水利工程施工过程中,项目承包管理(PMC)管理模式是一种新型的管理模式,被广泛应用于各大工程项目建设过程中。文章以实际工程为例,对PMC项目的概念进行了介绍,最后从进度把控、目标把控、索赔管控、PMC的施工管控、风险管控几方面对PMC项目管理在水利工程中的应用进行了具体的分析探讨,通过采用PMC模式进行工程实践后,施工要求得到满足,施工进度、风险及工程质量得到了很大程度的保障,值得在水利水电工程中推广借鉴。     

固定总价PMC合同模式实证研究

在我国基本建设项目中,固定总价PMC合同正在得到普及。抽取2014年以来在贵州省7个县州实施的10个中小型水库工程为样本,分析梳理出固定总价承包PMC的合同模式,并结合合同实施现状解析了固定总价承包PMC的问题点,给出了相应的政策建议和合同管理应对措施。     

水利工程PMC模式下农民工工资支付工作监管

近年来水利工程实行PMC管理模式的总包项目越来越多,PMC单位发挥的作用正受到各方的关注。大型灌区工程建设周期长,工作面多,使用农民工数量多,这对PMC单位管理农民工工资支付工作提出了更高的要求。总结了大型灌区工程农民工工资支付管理工作的要点,从农民工工资保证金、实名制、分账制、银行代发等方面入手,规范支付工作,进行过程监控,既保障了农民工权益,也维护了PMC单位形象。     

PMC模式在都匀市大河水库工程中的应用探析

都匀市大河水库工程由贵州省水利水电勘测设计研究院采用PMC模式实施,通过推行"科学化管理、合理化设计、精细化施工"的管理理念和手段,工程进展顺利。针对在项目实施过程中遇到的难点和采取的措施进行分析和探讨,为PMC模式在其他工程中的应用提供参考和借鉴。     

项目管理承包模式在老挝南塔河1号水电站建设管理中的应用

随着国家"一带一路"战略的深入推进,国外工程开发建设业务因此得到快速扩张。由于国外项目的工作生活条件大多异常艰苦,并且对项目管理的水平和效率要求比国内更高,许多中国投资公司难以在较短的时间内,扩招到适合国外项目工作需要的高端工程管理人才,因此大都采用聘请专业的工程咨询公司提供项目管理服务的方式,配套解决企业国际战略急剧扩张带来的管理需求。基于上述背景,老挝南塔河1号水电站项目的建设管理也采用了"项目管理承包(PMC)模式"。笔者对该项目的PMC模式及业主工程师的工作做了简要阐述,并对该项目取得的实效进行介绍及提出两点建议。     

水利水电勘测设计单位PMC项目档案管理工作研究

根据水利水电勘测设计单位进行项目管理承包的具体案例,研究在PMC项目中,水利水电勘测设计单位作为项目管理承包方档案工作的开展、档案工作的实施等问题。     

560PMC监控智能装置简介和应用

560PMC是集遥测、遥控、遥信于一体的多功能电力监控智能装置，具有自动监控、保护和通信功能。简单介绍560PMC的功能和应用。图1幅。     

项目管理总承包（PMC）模式合同管理研究

项目管理总承包(PMC)模式在水利工程建设中的应用越来越广泛,但项目管理在实施过程中如何较好地解决工程建设中进度、质量安全、投资控制、工程验收四大问题,合同管理是否到位、精细、精准,直接关系到项目四大目标的实现,影响项目管理总承包(PMC)单位对协调设计、施工、采购等关键环节管理的成败。本文对贵州省铜仁市大兴水利枢纽工程项目管理总承包(PMC)合同管理进行分析、研究,提出要做好合同管理必须建立健全合同管理组织机构,树立以合同管理为中心的理念,加强事前控制,严格履行合同,重视事后合同协调管理,实现坚持合作共赢,推进工程建设。     

浅谈水利工程项目管理模式

阐述了项目管理的概念,并根据水利工程建设自身的特点,对水利工程建设项目管理的模式进行了探讨。通过水利工程建设项目管理常见几种模式的比较,明确PMC模式是项目管理发展的趋势,PMC作为一种国外引进的项目管理模式,在我国水利工程建设中还处于探索阶段。在水利工程建设项目管理服务领域具有很大的发展潜力,但同样存在法律责任不明确、费用低、市场不成熟等实际问题,需进一步完善。     

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。     

Serial discontinuities in a Rocky mountain river. I. Distribution and abundance of plecoptera

Samples were taken year-round at eleven sites along the altitudinal profile (2900-1400 m a.s.l.) of the Gunnison River, a 329 km tributary of the Colorado River, to document the distribution of the Plecoptera and to evaluate responses to hypolimnial-release dams in the headwaters and middle reaches. Twenty-two species were present, with the greatest species richness occurring in an unregulated segment upstream of the middle reach dams; average nymphal biomass over the study period (175 organisms, 395 mg dry mass m^?2) was also greatest in this segment. Only four species (58 organisms, 48 mg m^?2) were present in the tailwaters of the headwater dam and values were greatly reduced (nine species; 35 organisms, 180 mg m^?2) below the middle reach dams. The stonefly community recovered ca. 80 km downstream from the last dam (15 species; 244 organisms, 250 mg m^?2), apparently in response to natural resetting of environmental conditions corresponding to those above the middle reach dams. At the most downstream site (11) only four species (four organisms, 16 mg m^?2) were present. The observed distributional pattern is a classic serial discontinuity in response to hypolimnial stream regulation in a temperate latitude river.     

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.