挤压墙工法对面板堆石坝应力变形影响规律研究     

侯文峻  张嘎  张建民 《岩土力学》2009,30(7):2147-2152

利用三维有限元数值模拟方法,分析了采用挤压墙的面板堆石坝的应力变形规律。与不采用挤压墙和采用半挤压墙型式的方案进行比较,研究了挤压墙的存在及其型式对于面板堆石坝应力变形响应的影响。计算结果表明,挤压墙的存在及其型式对于坝体的应力变形以及面板挠度变形影响较小;对面板的应力分布情况有一定影响,但不会对面板安全性产生明显影响;挤压墙的存在有利于减小周边缝的沉陷变位。  相似文献   

隔河岩大坝外观变形GPS自动化监测系统的灵敏度分析   总被引：8，自引：1，他引：7  

张小红  李征航  李振洪 《测绘通报》2000,(11):10-12

简要介绍了隔河岩大坝外测变形ＧＰＳ自动监测系统的概况,从模拟试验及用多种资源所进行了外部检核评定的该系统的灵敏度,表明该系统能用于精度要求很高的大坝外观形变监测。  相似文献   

Optimization of the Sefid-Roud Dam desiltation process using a sophisticated one-dimensional numerical model   总被引：1，自引：0，他引：1  

Ali KHOSRONEJAD 《国际泥沙研究》2009,24(2):189-200

Although water and soil conservation activities reduce reservoir sedimentation, it is inevitable that reservoirs fed by rivers transporting high amounts of sediment will experience sedimentation. The Ghezel-Ozan and Shah-Roud rivers, which flow to the Sefld-Roud reservoir dam, are both highly sediment-laden and transport significant amounts of sediment in both bed load and suspended load forms to the reservoir. Hence, it seems that the only practical way to remove the sediment from the reservoir is to flush it out using the Chasse method. In the present paper, field measurements of Chasse operation characteristics taken in previous years are presented, and a numerical model that simulates this process is introduced. After calibrating the model using field measured data, the calculated results （for reservoir pressure flushing and released sediment volume） of the numerical model were compared with other measured data for the same Chasse operation and the results agree well. Finally, using the numerical simulation results, the best approaches to ensure highly effective flushing while conserving reservoir water are presented （at least for the Sefid-Roud dam）. The operation of the bottom outlet gates, the shape of the output hydrograph, and the reservoir water level variation during flushing were optimized. In addition, the numerical model and related parameters, which need to be calibrated, are discussed.  相似文献   

玉江断裂对玉溪东风水库大坝的地震影响浅析     

王洋龙  王晋南  安晓文  毛玉平 《地震研究》2008,31(1):51-57

对玉江断裂的活动性进行了研究,并结合对滇中地区地震构造和震例的分析,认为该断裂是一条具备发生6.5级左右地震危险的地震构造,其主要危险地段为晚更新世活动段,该地段距离大坝仅为700 m.一旦发生地震,大坝将遭受Ⅷ度左右的破坏.地震虽然不会对大坝产生不可抗拒的断错破坏,但引起的地表应变值很可能大于0.65×10-4,严重威胁着大坝的安全.所以应该考虑对该坝体采取行之有效的抗应变加固措施.  相似文献   

某区水库大坝近期形变特征研究     

刘代芹  布艾杰尔·库尔班  方伟  朱治国 《内陆地震》2008,22(1):55-65

通过利用GPS和水准测量手段对某区水库大坝表面运动进行监测,获取大量的野外监测数据。通过内业计算得出每期的大坝各变形点的三维坐标,并结合、利用近3期的数据资料对比,求出各点的形变量。最终通过计算、分析得出水库主坝、东副坝及北副坝3个坝体的稳定性。  相似文献   

大坝安全诊断的混沌优化神经网络模型   总被引：2，自引：0，他引：2  

曹茂森  邱秀梅  夏宁 《岩土力学》2006,27(8):1344-1348

为了提高大坝变形的预测精度,采用小波变换和分形理论对大坝位移观测数据的非线性动力学特性进行了分析,揭示了其具有低维混沌动力特性,这为大坝变形预测模型的建立提供了理论依据和先验知识。基于低维混沌动力特性,设计了能捕获大坝位移观测数据全局动力特性,兼具神经网络模型结构优化和动力机制时新的混沌优化神经网络大坝变形预测模型。在工程实例中,由多个度量指标组成量化评价体系,对模型预测性能进行综合评价,结果表明,所建模型比传统BP神经网络和ARMA模型具有更高的预测精度。  相似文献   

广西灌江流域岩溶生态环境敏感性分析   总被引：1，自引：0，他引：1  

杜毓超  李兆林  陈宏峰  罗伟权 《中国岩溶》2006,25(3):220-227

灌江流域作为一个典型的岩溶环境单元,具有地表崎岖破碎、植被生长困难、生态系统脆弱、环境承载量低、环境变化敏感的特点。本文根据地表水系将流域划分为22个子流域,并利用层次分析法对生态环境敏感度进行分析评价,目的是为有关政府部门提供宏观依据,以便合理而有效地进行流域开发与环境整治。从整体上看,流域的生态环境为一般敏感,但在流域的不同区段,生态环境的敏感度仍存在着较大差异。白宝以南,两河以北地区的生态环境最为敏感,枧塘、文市、水车和新圩等地区次之,西山、洞井以北等地生态环境的敏感程度相对较低。   相似文献   

大坝变形预测模型的研究   总被引：8，自引：1，他引：7  

陆付民  任德记  何薪基 《岩土工程技术》2000,(4):204-207

１９９８年８月,为了减轻长江中下游的防洪压力,清江隔河岩水库蓄水一度超过正常蓄水位３ｍ多。以清江隔河岩大坝部分监测点的变形观测数据为例,详细介绍了大坝变形预测模型的建立方法,且运用一个实例验证了该方法的有效性。  相似文献   

关于长江三角洲两大开发工程的构想     

费希杰 《热带地理》2000,20(3):175-179

为了解决上海缺乏深水港址和宁波、舟山港腹地范围狭小的问题,提出了两个相互关联的宏大构想：一是在杭州湾建造锁海大坝并展开大规模的围垦造陆;二是兴建宁波至舟山的跨海交通与输水工程。这两大构想一旦付诸实施,其直接效益主要有二：１．为长江三角洲增加数千平方公里的土地;２．今后可望在宁波－舟山建成世界超级大港和千万人口级特大城市。更进一步的影响则是在锁海大坝沿线和钱塘江下游沿岸将出现两个新的产业密集带与城镇  相似文献   

Local scour and the laws of scour pit’s shape downstream of debris flow sabo dam   总被引：2，自引：2，他引：0  

Hua-li Pan  Shun Yang  Guo-qiang Ou  Jiang-cheng Huang 《山地科学学报》2013,10(6):1063-1073

The erosion shape and the law of development of debris flow sabo dam downstream is a weak part in the study on debris flow erosion. The shape and development of scour pit have an important effect on the stability and safety of debris flow sabo dam, which determines the foundational depth of the dam and the design of protective measures downstream. Study on the scouring law of sabo dam downstream can evaluate the erosion range and reasonably arrange auxiliary protective engineering. Therefore, a series of flume experiments are carried out including different debris flow characteristics （density is varying from 1.5 t/m3 to 2.1 t/m~） and different gully longitudinal slopes. The result shows that the scour pit appears as an oval shape in a plane and deep in the middle while superficial at the ends in the longitudinal section, the position of the maximum depth point moves towards downstream with an increase of flume slope angle. The maximum depth of scour pit is mainly affected by the longitudinal slope of gully, density of debris flow, and the characteristics of gully composition （particle size and the viscosity of soil）. The result also indicates that the viscosity of soil will weaken the erosion extent. The interior slopes of scour pit are different between the upstream and the downstream, and the downstream slope is smaller than the upper one. For the viscous and non-viscous sands with the same distribution of gradation, the interior slope of non- viscous sand is smaller than the viscous sand.According to tbe regression analysis on the experimental data, the quantitative relationship between the interior slope of scour pit, slope of repose under water and the longitudinal slope of gully is established and it can be used to calculate the interior slope of scour pit. The results can provide the basis for the parameter design of the debris flow control engineering foundation.  相似文献