强震作用下小湾拱坝横缝变形控制研究

在已有研究成果的基础上，以世界上第一高拱坝——292m高的小湾拱坝为工程背景，研究了横缝配筋的控制措施和高拱坝强震横缝变形控制的原则和分析方法，提出了考虑钢筋与坝体混凝土相互作用的横缝配筋三维动力非线性数值模型，对设计地震作用下的小湾拱坝进行了三维动力非线性分析，论证了该控制措施的有效性和可行性，并据此对小湾拱坝横缝配筋的布置进行了探讨，以期为高拱坝的强震控制提供有益的参考。     

湖南镇大坝安全监测系统回顾及改进

本文通过对湖南镇大坝安全监测系统回顾及其精度剖析，指出监测系统设计和监测设备中存在的问题，并有针对性地结合该大坝的特点，阐述了精度相对较低的项目如何对其观测方法、设备进行改进或改造，以提高观测精度。本文对其他混凝土大坝安全监测系统的设计和改造具有一定的参考价值。     

汾河临汾城区段蓄水美化工程建设特点及工程措施

汾河临汾城区段蓄水美化工程位于汾河下游，针对发生中小洪水机率高、河道水质差、水源缺乏、河床易冲刷且渗漏严重等特点，采取了分槽泄洪、排污、桩柱抗冲、高喷防渗、多种水源补水等措施。     

Explicit Schemes for Dam-Break Simulations

Dam-break problems involve the formation of shocks and rarefaction fans. The performance of 20 explicit numerical schemes used to solve the shallow water wave equations for simulating the dam-break problem is examined. Results from these schemes have been compared with analytical solutions to the dam-break problem with finite water depth and dry bed downstream of the dam. Most of the numerical schemes produce reasonable results for subcritical flows. Their performance for problems where there is a transition between subcritical and supercritical flows is mixed. Although many numerical schemes satisfy the Rankine-Hugoniot condition, some produce solutions which do not satisfy the entropy condition, producing nonphysical solutions. This was the case for the majority of first-order schemes examined. Numerical schemes which consider critical flow in the solution are guaranteed to produce entropy satisfying solutions. Second-order schemes avoid the generation of expansive shocks; however, some form of flux or slope limiter must be used to eliminate oscillations that are associated with these schemes. These limiters increase the complexity and the computational effort required, but they are generally more accurate than their first-order counterparts. The limiters employed by these second-order schemes will produce monotone or total variation diminishing solutions for scalar equations. Some limiters do not exhibit these properties when they are applied to the nonlinear shallow water wave equations. This comparative study shows that there are a variety of shock-capturing numerical schemes that are efficient, accurate, robust, and are suitable for solving the shallow water wave equations when discontinuities are encountered in the problem.     

山西省汾河二库枢纽工程建设简介

本文较系统地介绍汾河二库枢纽工程建设的基本情况，并就工程采用的新技术、新工艺、新设备、新材料以及工程建设的主要经济和教训作了简要分析和介绍。     

大坝加高试验温度应力仿真计算与原型监测对比分析

根据现场施工条件,对丹江口大坝2次加高试验进行了温度应力仿真计算,并对现场原型监测资料进行了分析,其计算结果与原型监测结果基本一致.通过对比分析后认为:施工期的温度应力不是控制因素,最大拉应力出现在试验块温度准稳定期,气温年变化是影响新老混凝土结合面应力状态的主要因素;新老混凝土结合面开度随年气温呈周期变化,并且任一时刻,结合面都是部分脱开部分接触.     

柘溪大坝1#支墩劈头裂缝处理及效果分析

本文介绍了柘溪大坝1#支墩劈头裂缝水下处理施工情况,通过施工期间漏水量的变化,分析了影响漏水量变化的因素,通过施工结束后漏水情况,对处理的效果进行了分析。     

寒冷地区面板堆石坝面板顶部止水研究

针对寒冷地区面板堆石坝面板顶部止水遭破坏情况，对破坏机理进行了分析。通过室内试验及现场试验，提出了适合寒冷地区的面板顶部止水结构和止水材料，成功地解决了莲花面板石坝面板止水缝表面防护问题，并为混凝土面板坝的面板顶部止水设计及巳建的面板顶部止水破坏修补提供参考。     

Remedial measures to control seepage problems in the Kafrein dam, Jordan

The Kafrein dam, 480 m long and 30 m high, is located on the Wadi Kafrein, a few kilometres from the active Jordan Valley fault. The Jordan Valley Authority proposed raising the crest of the existing dam by approximately 7 m and extending the length of the embankment to 554 m, in order to increase its storage capacity by 6 million m³ to a total of 8.5 million m³. The paper discusses the likelihood that existing seepage problems will be exacerbated when the dam is raised and proposes some remedial actions to increase the safety of the dam and minimise both the amount of seepage and any adverse effects. Electronic Publication     

浆砌石隔墙式硬壳坝在大禾坑水库中的应用

江西省于都县大禾坑水库采用浆砌石隔墙式硬壳坝．经12年的运行，没有产生硬壳断裂和位移。