黄河沙坡头水利枢纽设计中遇到的若干问题

沙坡头水利枢纽位于宁夏中卫黄河干流上，是以灌溉和发电为主的综合利用工程，也是我国西部开发的重点水利工程。重点介绍设计如何解决若干挑战性问题，如导流明渠设计、基础处理、电站排沙措施、左岸台地的渗流控制以及泄洪闸的运行方式。     

鲁布革水电站右岸泄洪洞漏水处理

鲁布革水电站右岸泄洪洞承担着鲁布革大坝泄洪、排沙、放空水库的任务，是最重要的泄洪、排沙通道。自投运以来，事故门下游侧隧洞左边墙漏水较为严重，一直未得到有效解决，2006年进行化学灌浆处理，效果良好，消除了安全隐患。     

水布垭水利枢纽三维渗流场有限元分析

 通过数值模拟分析了心墙堆石坝坝体、坝基和两岸山体的渗流分布规律和防渗帷幕的作用效果，以及坝体、坝基渗透参数变化和不同运行工况等因素对渗流场的影响；结合有关渗透稳定性试验成果，对坝体及坝基的渗流状态作了初步的分析和评价，提出了相应的渗流控制措施。     

渠道工程冲刷、淤积、渗漏的防护措施

主要介绍了如何防止渠道的冲刷、淤积和渗漏及其计算公式和防护措施。     

An Algorithm for Perspective Viewing of Objects Represented by Octrees

A new algorithm is presented for viewing three-dimensional objects, represented by an octree, from an arbitrary location. The algorithm generates aperspective view of the objects while eliminating hidden surfaces. The viewer can be located anywhere inside or outside the objects. The algorithm presented in this short notefixes an artifact that is generated by a previously published algorithm due to Meagher when the viewer is located in certain regions in space. The new algorithm traverses the octree in a back-to-front order and recursively chooses correct orders for visiting the sons of non-leaf nodes.     

SOURCE ROCK POTENTIAL OF THE BLUE NILE (ABAY) BASIN, ETHIOPIA

The Blue Nile Basin, a Late Palaeozoic ‐ Mesozoic NW‐SE trending rift basin in central Ethiopia, is filled by up to 3000 m of marine deposits (carbonates, evaporites, black shales and mudstones) and continental siliciclastics. Within this fill, perhaps the most significant source rock potential is associated with the Oxfordian‐Kimmeridgian Upper Hamanlei (Antalo) Limestone Formation which has a TOC of up to 7%. Pyrolysis data indicate that black shales and mudstones in this formation have HI and S₂ values up to 613 mgHC/gCorg and 37.4 gHC/kg, respectively. In the Dejen‐Gohatsion area in the centre of the basin, these black shales and mudstones are immature for the generation of oil due to insufficient burial. However, in the Were Ilu area in the NE of the basin, the formation is locally buried to depths of more than 1,500 m beneath Cretaceous sedimentary rocks and Tertiary volcanics. Production index, T_max, hydrogen index and vitrinite reflectance measurements for shale and mudstone samples from this areas indicate that they are mature for oil generation. Burial history reconstruction and Lopatin modelling indicate that hydrocarbons have been generated in this area from 10Ma to the present day. The presence of an oil seepage at Were Ilu points to the presence of an active petroleum system. Seepage oil samples were analysed using gas chromatography and results indicate that source rock OM was dominated by marine material with some land‐derived organic matter. The Pr/Ph ratio of the seepage oil is less than 1, suggesting a marine depositional environment. n‐alkanes are absent but steranes and triterpanes are present; pentacyclic triterpanes are more abundant than steranes. The black shales and mudstones of the Upper Hamanlei Limestone Formation are inferred to be the source of the seepage oil. Of other formations whose source rock potential was investigated, a sample of the Permian Karroo Group shale was found to be overmature for oil generation; whereas algal‐laminated gypsum samples from the Middle Hamanlei Limestone Formation were organic lean and had little source potential     

南水北调东线田山倒虹吸深基坑截渗技术

结合多头小直径深层搅拌桩截渗在南水北调济平干渠田山倒虹吸工程成功应用实例,详细介绍了在高水头、不利地质条件下深基坑开挖中截渗墙方案的设计选取与施工。     

福建九龙江北溪水闸三维仿真管理

阐述了采用最新的计算机虚拟仿真、地理信息和数据库等技术,研制福建省九龙江北溪水闸三维仿真管理系统,给出了系统的功能、总体框架、数据流程及关键技术,实现了系统的具体功能。     

沥青灌浆堵漏技术

与其它灌浆止漏材料比较，用于热沥青灌浆堵漏的沥青浆液，具有不被水流稀释的特点，即使在流速很大的情况下，也能将渗水通道堵塞。且具较大的工程实用价值。     

垂直铺塑和深层搅拌桩墙在土堤(坝)垂直防渗中的应用

垂直铺塑和深层搅拌防渗技术是近年来发展起来的新的提(坝)垂直防渗技术。通过工程实践，总结了这2项技术的适应条件、防渗机理，分析了其防渗的可靠性、经济性及发展前景，提供了垂直铺塑和深层搅拌的施工工艺和施工经验。