大隆水利枢纽工程坝基处理

大隆水利枢纽工程坝基处理主要包括振冲加密和垂直防渗工程。大坝轴线附近的防渗墙、基岩固结和帷幕灌浆，以及上游坝脚处的高压摆喷防渗墙，在坝基构成了垂直防渗体系。完整的垂直防渗工程对大坝的渗透稳定将起到关键的作用。     

刍议钢衬灌浆的施工方法

水利工程中防渗工程十分重要,钢衬灌浆是防渗工程的主要手段之一。文章主要对钢衬灌浆的材料、制浆过程、灌浆设备、灌浆工序和检验方法进行研究。     

浅析高压喷射灌浆防渗加固技术

高压喷射灌浆施工防渗加固技术是近十几年来逐渐发展起来的一项新兴工程技术,主要用于工程地质加固、地基处理、坝基防渗处理、土石围堰块球体处理、下游引航道防渗等工程中,实践表明使用高压喷射灌浆技术截断渗漏层,防渗效果明显,是水库土坝、堆石坝等坝型基础防渗、坝肩防渗和工程地质加固、地基处理等方面一个十分有效的方法,是一种工效很高的防渗工艺,有广阔的发展前景。     

高压摆喷灌浆技术在小型水库基础防渗中的应用

根据久安水库工程地质情况的分析,选择高喷灌浆技术对水库坝基进行防渗处理.结合工程实际介绍了高喷灌浆技术原理、技术要求、施工流程、常见问题的处理等等,为其他类似工程防渗处理提供参考.     

帷幕灌浆在角木塘水电项目中的应用

针对角木塘水电施工特殊的地理环境,防渗帷幕灌浆施工是本工程的重点,灌浆质量对水库的蓄水十分重要,必须严格按规范及设计要求认真进行每一个环节施工。重点阐述钻孔灌浆工程在大坝防渗帷幕灌浆、坝基固结灌浆、导流洞回填灌浆等施工中的应用及特殊情况下的应对措施。     

水溶性聚氨酯防渗灌浆的设计

结合参窝、观音阁等水库工程防渗灌浆的实践 ,论述了采用水溶性聚氨酯进行防渗堵漏灌浆方案设计中的防渗区的界定 ,灌浆孔的布设及浆液配合比选择等方面的制订原则、方法和相关技术。浆液配合比主要根据裂缝变形特征 (死缝或活缝 )和裂缝界面条件 (填塞、粘结、胀塞等不同防渗机理 )来选定 ,活缝灌浆应以Lw浆液为主 ,按胀塞机理处理裂缝 ,其适应性广、可靠性较高     

水利水电工程中防渗处理施工技术综述

渗漏是水利水电工程中最常见的病险问题之一。防渗处理技术与水电水电工程的正常运转有着紧密的联系,对水利水电工程的经济效益有着直接的影响。因此,防渗处理施工技术已成为了水电水电工程技术人员研究的重要课题。本文分析了各种防渗处理技术,介绍了防渗处理施工技术在水利水电工程中的具体应用。     

水利水电工程中防渗处理施工技术综述

渗漏是水利水电工程中最常见的病险问题之一.防渗处理技术与水电水电工程的正常运转有着紧密的联系,对水利水电工程的经济效益有着直接的影响.因此,防渗处理施工技术已成为了水电水电工程技术人员研究的重要课题.本文分析了各种防渗处理技术,介绍了防渗处理施工技术在水利水电工程中的具体应用.     

长顺水电站围堰地基防渗的多种灌浆技术

深厚砂砾石层围堰地基,采用孔口封闭式静压水泥灌浆进行第一次防渗处理,上、下游围堰渗水量巨大,基坑无法开挖。上游围堰采用套管护壁法静压水泥灌浆,下游采用高压喷射灌浆与套管护壁法静压水泥灌浆相结合的第二次防渗处理,防渗效果显著,保证了工程顺利进行。文章力图通过长顺水电站围堰防渗处理工程,综述各种灌浆技术在围堰地基防渗中的应用,分析对比其优劣,探寻围堰地基防渗一般规律,以资同行借鉴。     

综合防渗技术在黄岗水库防渗加固工程中的应用

水库大坝综合防渗加固技术具有投资省、防渗墙体连接均匀完整可靠、防渗效果好、施工速度快等特点.通过黄岗水库的实践,为该项技术的推广提供了一个典型实例工程.     

Peak operation of a hydroelectric station as a factor in formation of backflow in a lateral tributary

Conclusions Peak operation of an HES is capable of leading to formation of backflow in a tributary emptying into its lower pool. The flow characteristics (rate, duration) can be found from data on fluctuations in level with the use of the suggested schemes. As applied to the confluence of the Desna and Dnepr, we can conclude that in ordinary operating conditions of the Kiev HES it is practically impossible for Dnepr water to reach the existing or planned water intakes.Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 9, pp. 22–26, September, 1994.     

大尺度圆柱周围的波流场的耦合计算

本文利用波浪弥散关系的迭代计算求得波向与流向的夹角，并用有限元法求解含流的缓坡方程，得到在缓变地形和定常流场共同影响下的大尺度圆柱周围的波流场的耦合解。     

Non-spherical multi-oscillations of a bubble in a compressible liquid

Bubble dynamics are associated with wide and important applications in cavitation erosion in many industrial systems, medical ultrasonics and underwater explosions. Two recent developments to this classical problem are reviewed in this paper. Firstly, computational studies on the problem have commonly been based on an incompressible fluid model. However, a bubble usually undergoes significantly damped oscillation due to the compressible effects. We model this phenomenon using weakly compressible theory and a modified boundary integral method. This model considers the energy loss due to shock waves emitted at minimum bubble volumes. Secondly, the computational studies so far have largely been concerned with the first-cycle of oscillation. However, a bubble usually oscillates for a few cycles before it breaks into much smaller ones. We model both the first- and second-cycles of oscillationand predict damped oscillations. Our computations correlate well with the experimental data.     

Changes in pool size in response to a reduction in discharge: a flume experiment

Management of river systems can create a reduction in flow with associated potential impacts on channel morphology. A total of 30 flume runs were conducted with two different sediment sizes to determine the effect of a reduction in flow on pool size and depth in confined channels. The experiments were conducted in a 6 m long, 0.5 m wide recirculating flume. Pools were scoured adjacent to a triangular‐shaped obstruction to flow from an initially flat bed. After 3 h of high flow, bed topography was measured and the flow was changed to a level of 50, 67, 80, 85 or 100% of the original flow. Changes in bed topography were then measured after 3 h under the modified flow regime. Results indicate that a reduction in flow creates smaller volume pools. With well sorted, fine‐sand substrate, changes in pool volume, volume of deep habitat and depth were significant for both 50 and 80% reductions in flow level. However, development of an armor level in experiments with poorly sorted, very coarse sand limited sedimentation at lower flows. Consequently, no changes in pool size were statistically significant with this sediment. The results suggest that data on the dimensions of pools are needed prior to any flow modifications in order to detect degradation of the physical pool habitat. Monitoring programs initiated after flow regulation may only identify changes in a limited number of cases where sediments are mobile at low flows and the reduction in flow level is severe. Copyright © 2005 John Wiley & Sons, Ltd.     

Creating a disturbance: manipulating slackwaters in a lowland river

The dynamic nature of habitat patches in rivers is driven primarily by flow regime. Altered hydrology, through river regulation, can limit the size and distribution of slackwater patches; important areas for the development of young fish and for shrimp in lowland rivers. Between late October 2002 and late January 2003, we investigated responses of fish, shrimp and their potential prey to the experimental creation of slackwaters and, conversely, to the experimental creation of flowing patches, by diverting water away from flowing patches and into slackwater patches, respectively. A pre‐experimental survey indicated that slackwaters contained many more fish than flowing patches, and fish larvae were flushed out of slackwaters during the construction of flowing patches. Creation of slackwaters resulted in increased abundance of fish and shrimp, with the opposite occurring when slackwaters were changed into flowing patches. Converting slackwaters into flowing patches, and vice versa, altered the species composition of zooplankton and microbenthic assemblages but did not change their densities. Thus, standing crop of potential prey alone could not explain the differences in fish or shrimp abundance found between patch types. We hypothesize that slackwaters primarily act as refuges from current and provide energetic advantages to the young stages of fish and to shrimp. River regulation has the potential to affect the recruitment success of fish and shrimp by affecting the size, arrangement and availability of slackwater patches. Copyright © 2006 John Wiley & Sons, Ltd.     

暴雨洪水流域系统随机模拟（研究之二）

暴雨洪水流域系统的输入,本文首次成功地引用具有明显优点的正则展开模型随机模拟暴雨过程;流域系统的输送,采用了简便可行的产、汇流模型;各子模型及系统输出的洪水过程检验表明,流域系统随机模拟的效果是令人满意的。     

Streambed instabilities around a bridge pier in a dredged channel

We conducted flume experiments to study the morphological behaviour around a circular pier located downstream of a mining pit. Severe transverse erosion at the pier base as well as lowering of channel bed upstream of the pier was observed because of channel dredging. Streambed instability was analysed based on two non‐dimensional parameters, namely, pier exposure factor and normalized upstream incision depth. The maximum values of both these parameters were observed when the mining pit was dredged closest to the pier. We also observed growth in streambed instability with an increase in flow Reynolds number.