阿尔夏提水库浇筑式沥青混凝土心墙施工技术与质量控制

【摘要】本文针对新疆阿尔夏提水库库区气候及材料特点,结合大坝沥青混凝土心墙施工配合比、拌和站布置、施工方法、施工工艺及质量控制等要求,探索总结出适用于小型工程沥青混凝土心墙施工及质量控制的方法。     

中国大坝设计洪水计算、评估与确定

回顾了新中国成立60年来中国大坝设计洪水计算的发展历程,总结了取得的经验和教训。在介绍现行规范规定的大坝设计洪水计算方法基础上,重点对中国大坝设计洪水的评估与确定进行了分析研究。     

马河水库大坝砂壳加固的试验xOt-究

结合马河水库除险加固的具体工程实践,通过对大坝砂壳振冲和翻压两种加固方法的试验资料的分析,证明了这两种加固方法的可靠性以及加固效果,为砂壳坝的加固提供可借鉴的实际资料。     

泽城西安水电站混凝土面板堆石坝铜止水连续施工工艺

面板是混凝土面板堆石坝安全稳定的重要部位,铜止水制作和安装是面板防渗关键环节。在泽城西安水电站大坝面板施工过程中,采用自行设计的铜止水加工模具,结构简单、操作方便,实现了铜止水的连续加工成型,最大限度地减少了铜止水的焊缝,节约了施工成本,加快了施工进度,并提高了铜止水的施工质量。     

浅埋偏压黄土隧洞进洞方案与施工技术

山西省大水网的建设中隧洞工程较多,超前小导管和钢拱架联合支护作为隧洞洞口及通过软弱破碎带之主要辅助工法,由于其施工速度快、安全性高、工期短,目前已广泛应用于隧洞工程。山西省中部引黄工程交汾灵支线2号隧洞出口为浅埋偏压黄土洞段,文中就此洞口的进洞方案与施工技术做了介绍,工程实践表明,其有效地减小了地表下沉和围岩变形,达到了确保不良地质段安全施工的目标。     

DISTRIBUTION AND ABUNDANCE OF STREAM FISHES IN RELATION TO BARRIERS: IMPLICATIONS FOR MONITORING STREAM RECOVERY AFTER BARRIER REMOVAL

Dams are ubiquitous in coastal regions and have altered stream habitats and the distribution and abundance of stream fishes in those habitats by disrupting hydrology, temperature regime and habitat connectivity. Dam removal is a common restoration tool, but often the response of the fish assemblage is not monitored rigorously. Sedgeunkedunk Stream, a small tributary to the Penobscot River (Maine, USA), has been the focus of a restoration effort that includes the removal of two low‐head dams. In this study, we quantified fish assemblage metrics along a longitudinal gradient in Sedgeunkedunk Stream and also in a nearby reference stream. By establishing pre‐removal baseline conditions and associated variability and the conditions and variability immediately following removal, we can characterize future changes in the system associated with dam removal. Over 2 years prior to dam removal, species richness and abundance in Sedgeunkedunk Stream were highest downstream of the lowest dam, lowest immediately upstream of that dam and intermediate farther upstream; patterns were similar in the reference stream. Although seasonal and annual variation in metrics within each site was substantial, the overall upstream‐to‐downstream pattern along the stream gradient was remarkably consistent prior to dam removal. Immediately after dam removal, we saw significant decreases in richness and abundance downstream of the former dam site and a corresponding increase in fish abundance upstream of the former dam site. No such changes occurred in reference sites. Our results show that by quantifying baseline conditions in a small stream before restoration, the effects of stream restoration efforts on fish assemblages can be monitored successfully. These data set the stage for the long‐term assessment of Sedgeunkedunk Stream and provide a simple methodology for assessment in other restoration projects. Copyright © 2011 John Wiley & Sons, Ltd.     

柘林大坝第二溢洪道泄洪运行安全分析

柘林大坝第二溢洪道泄洪闸结构稳定,位移和渗流运行性态正常,泄流能力满足原设计要求。但尾渠内人口稠密、房屋林立,一旦泄洪,如何保障尾渠内的人民生命财产安全是本工程泄洪运行需要重点关注的问题。因此,电厂必须与地方政府联动,制定出切实可行的防洪抢险应急预案,警钟长鸣、定期演练,以能在泄洪非常时期把损失降到最低。     

水布垭大坝总渗流量突变成因分析

介绍了水布垭水电站大坝加密监测及巡视检查的情况,从监测资料、巡视检查的角度,对坝体总渗流量2012年4月发生突变的情况进行了综合分析,分析成果为水布垭水电站安全稳定运行提供了依据。     

溪洛渡水电站拱坝施工期坝基变形监测分析

为了解溪洛渡水电站拱坝坝基在施工期、蓄水初期及运行期不同阶段的变形情况和工作状态,确保大坝安全,同时为给工程建设及运行期管理提供科学依据,对坝基垂直位移和水平位移进行了监测,并对监测资料进行了初步分析.监测结果表明拱坝坝基沉降变形比较均匀,变化规律正常.     

基于Optistruct的重力坝拓扑优化应用研究

基于Optistruct的变密度法,结合应变能优化准则对实体重力坝非溢流坝段进行拓扑优化.优化结果表明,坝体的应力、安全系数等指标均满足规范要求,证明了拓扑优化在重力坝剖面优化中的可行性和有效性.并进一步对优化结果进行数据拟合,分别对传统直线断面、三次曲线断面和折线断面进行了静力分析,发现折线断面在满足规范要求的情况下,坝趾竖向压应力更小,更符合应用要求.