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高应力对拱坝无应力计测值的影响分析 总被引:1,自引:1,他引:0
通过对特高拱坝无应力计原型观测资料的分析,介绍了无应力计出现有应力状态的变化过程,分析了可能产生这种异常现象的原因。并分析计算了无应力计筒内混凝土的垂直应力,初步探讨了高应力对无应力计测值的影响。 相似文献
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应变计及无应力是常用来观测混凝土大坝中应变及应力的仪器,通过对宁波市周公宅水库大坝中埋设的无应力计观测资料的分析,表明无应力计不仅可以用于计算大坝的应力,而且可以转换成大坝的温度膨胀系数及混凝土的自身体积变形。 相似文献
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本文利用无应力计测值进行了公伯峡混凝土面板湿度变形的研究。观测成果证明,由于观测技术的提高,无应力计能较精确地反映出混凝土的湿度变形,包括干缩与湿胀。公伯峡的无应力计监测成果为水工建筑物原型观测湿度变形提供了极有价值的实例。 相似文献
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无应力计是应力应变监测的重要配套仪器,它的监测数据不仅在应变计算时要用到,而且在进行温度应力计算和混凝土抗裂研究时需要加以考虑以及对施工期混凝土温度控制和裂缝防治也是非常重要的.通过对坝体无应力计监测资料的分析,评价了碾压混凝土坝的无应力变形和自生体积变形的变化规律,为大坝的温度应力计算和混凝土抗裂研究提供了参考. 相似文献
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混凝土自生体积变形在应变计观测资料整理分析中是必不可少的参数,是分析混凝土构件的变形和受力状态的重要参考量,但是目前对混凝土自生体积变形的产生机理尚无一个确切的定论,对其特性也有不同的认识。这就需要对混凝土自身体积变形进行实测,一般情况就是采用无应力计来观测混凝土自身体积变形情况,通过锦屏一级工程实例,对大坝混凝土无应力计监测成果分析来论证混凝土自身体积监测应该主意的问题。 相似文献
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混凝土自生体积变形与无应力计 总被引:1,自引:0,他引:1
文中概要地说明了混凝土白生体积变形的性质,阐述了无应力计的原理及其运用中存在的问题,并对《水利规划与设计》2008年第4期刊登的“鱼简河碾压混凝土拱坝原型观测资料分析”一文中的有关问题进行讨论。 相似文献
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Analysis of causes of erosion-corrosion wear of the metal of internal surfaces of watered regions of tubes of heat-exchange devices 总被引:1,自引:0,他引:1
I. I. Belyakov V. I. Breus 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2006,40(1):44-49
Causes of the appearance of erosion-corrosion wear (ECW) on inlet regions of tubes of heat-exchange devices are considered.
Experimental data are used for determining the mechanism of the ECW process and suggesting measures for its prevention.
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Translated from élektricheskie Stantsii, No. 11, November 2005, pp. 56–62. 相似文献
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分析了鹤岗市水资源开发利用现状;预测了城市需水量;提出了"十一五"期间水资源合理配置的对策与措施。 相似文献
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介绍SIMHYD降水径流模型的结构及计算原理,利用该模型模拟了丹江口以上汉江上游流域的月流量过程,并采用区间分析方法分析SIMHYD模型参数的敏感性。结果表明:SIMHYD模型可以较好地模拟该流域的月流量过程;根据参数敏感性大小可将SIMHYD模型参数归为3类:第1类为敏感参数,如SMSC和SUB;第2类为较敏感参数,如CRAK和K;第3类为非敏感参数,如INSC,COEFF和SQ。 相似文献
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水利枢纽下游河道水位流量关系的变化 总被引:1,自引:0,他引:1
卢金友 《水利水运工程学报》1994,(Z1)
根据水利枢纽下游河道的实测资料,得到下游河道水位流量关系的调整变化,并对其变化原因进行了分析。 相似文献
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宋隆水闸已运行70多年,工程存在设计标准低、闸门和水闸安全度不足等问题。除险加固方案经比较后,采用在闸前加闸的方案,并结合工程实际进行优化设计,加快施工进度,节省投资。竣工后经过3次大洪水考验,工程运行良好。 相似文献
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V. V. Lgalov G. N. Tsedrov 《Power Technology and Engineering (formerly Hydrotechnical Construction)》1971,5(7):654-656
Conclusions For the first time the method use for investigating flow separators of high-head structures made it possible to recreate on
a model cavitation phenomena that occurred in the original. The studies established the main cause of destruction of the elements
of separators. The sources of cavitation that involved destruction of the concrete on the surface of the separators are: the
presence of a sharp edge at the junction of the top and side surfaces of the separator; the presence of a poorly streamlined
section at the initial part of the separator at the junction of the vertical side faces and surface of the spillway at the
entrance to the gap between the separators; the presence of construction defects on the surfaces of the separator (depressions,
pits, beds, and, especially, projections from formwork offsets). The last, as the experiments showed, are the most dangerous,
especially if their vertical face is oriented against the flow.
Rounding of the edges can eliminate the occurrence of cavitation on the side surface at the start of the separators; however,
the requirements imposed on the quality surfaces remain the same, since this does not eliminate cavitation on irregularities.
Facing of the separators and adjacent spillway surfaces with metal provides sufficient smoothness and greatly increases the
resistance of the surface to cavitation erosion. Here one can consider that the lining practically eliminates the appearance
of concealed but probable defects on the concrete surfaces during operation of the structures.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 7, pp. 36–38, July, 1971. 相似文献
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V. M. Vlasov V. I. Veretyushkin A. P. Nikolaev A. S. Moiseenko L. M. Deryugin V. L. Pavlov V. N. Sugachenko L. S. Permyakova 《Power Technology and Engineering (formerly Hydrotechnical Construction)》1989,23(4):225-233
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 4, pp. 48–53, April, 1989. 相似文献