共查询到20条相似文献，搜索用时 125 毫秒
1.
为了减少坝前填垫层料的超填工程量,简化混凝土面板施工前的削坡处理、斜坡碾压以及护坡砂浆施工等繁琐工序,给混凝土面板施工提供一个相对平整、均质的支托基础面,同时也为施工期间的防洪度汛提供一个防止雨水冲刷的稳固坡面,最大限度地延长筑坝施工时段,减轻高强度筑坝压力,确保大坝安全度汛,采用混凝土挤压边墙这一新技术、新工艺代替上游护坡砂浆施工不失为有效措施. 相似文献
2.
吉林双沟水电站大坝坝高110m,是东北地区目前在建的最高混凝土面板堆石坝.大坝的石料场设在大坝的上游,全部上坝料需跨越趾板上坝.据了解,国内目前还没有像双沟水利枢纽工程这样全部上坝料是通过跨趾板上坝的.从双沟水电站跨趾板桥的设计,施工及运行效果来看,跨趾板上坝技术的实施是成功的. 相似文献
3.
芦琴 《杨凌职业技术学院学报》2011,10(4):7-9
碾压混凝土坝由于其自身特点得到广泛的应用,但也存在较严重的裂缝问题。本文在碾压混凝土坝施工过程仿真计算的基础上研究了碾压混凝土坝的温控防裂措施,以期对生产实践有一定的指导意义。 相似文献
4.
王穗萍 《长江工程职业技术学院学报》2012,(4):1-4,9
丹江口大坝加高工程左岸土石坝坝型为黏土心墙坝,设计采用塑性混凝土防渗墙加固方案。本工程施工技术先进,工程质量优良。文中介绍了造墙施工技术和方法,可供类似工程参考和借鉴。 相似文献
5.
结合舟坝水电站碾压混凝土重力坝施工实际，总结出碾压混凝土坝的温控与防裂、特殊天气处理措施等，对碾压混凝土重力坝施工具有一定的借鉴价值。 相似文献
6.
任重阳 《长江工程职业技术学院学报》1988,(1)
钢筋混凝土面板堆石坝(简称面板坝,下同)是国家“七五”期间重点科技攻关项目。据在坝工技术领域中领先的美国垦务局坝工专家理查森介绍,当今筑坝技术中,碾压混凝土与面板坝是最具有竞争能力的两种坝型,其它传统坝型(包括重力坝、拱坝、连拱坝、大头坝及土石坝)的竞争能力却须大打折扣,甚至在设计初期的坝型比选过程中,也难有一席之地。 相似文献
7.
简要介绍了某水电站混凝土面板堆石坝工程概况和流变计算模型。采用三维有限单元法对该混凝土面板坝筑坝及蓄水过程进行模拟计算,对比考虑堆石料流变和不考虑流变的两种计算结果,分析说明筑坝材料的流变特性对面板坝坝体以及混凝土面板变形应力的影响。 相似文献
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9.
张春娟 《杨凌职业技术学院学报》2011,10(1):1-3,12
混凝土重力坝是中国坝工建设中的主要坝型,具有安全可靠、设计施工技术简单、对地形地质条件适应性好、施工导流和永久性泄洪问题容易解决等优点。重力坝的剖面设计是重力坝设计的一项主要内容,本文分析计算了非溢流混凝土重力坝剖面参数x1、x2、x3与上游水位、抗剪摩擦系数、扬压力折减系数的关系,结果表明随着摩擦系数的增加或上游水位的减小,上游折坡点位置逐渐变低,上游坝坡逐渐减小,直到上游变为直立面,下游坝坡逐渐减小,直到本文给定的最小下游坝坡0.5,且扬压力折减系数对坝体剖面的影响与抗剪摩擦系数的关系比较大,为工程设计提供了有益参考。 相似文献
10.
挤压边墙施工方法是混凝土面板堆石坝面板坡面施工的一种新方法,根据它诸多优点,如：分层施工、强度均衡、简单易行、安全可靠,可广泛应用于南方广大地区与北方局部地区,值得大力推广应用。 相似文献
11.
The theory and method of system integration for the real-time monitoring of core rock-fill dam filling con- struction quality are studied in this paper. First, the importance analysis of system integration factors is carried out with the analytic hierarchy process. Then, according to the analysis result of integration factors, the conceptual model of system integration is built based on function integration, index integration, technology integration and information integration, the index structure of core rock-fill dam filling construction quality control is constructed and the method of function integration and technology integration is studied. The mathematical model of process monitoring is built according to monitoring objective, process and indexes. Research results have been applied in Nuozhadu core rock-fill dam construction management, realizing system integration through building appropriate monitoring work flow and comprehensive information platform of digital dam. 相似文献
12.
简要介绍了冲击碾压技术的特点,并结合工程实际,分析探讨了这一新技术、新工艺在混凝土面板堆石坝填筑施工中运用的可能性,提出了解决在其实施中不足的措施. 相似文献
13.
An optimal allocation of earth is of great significance to reduce the project cost and duration in the construction of rock-fill dams. The earth allocation is a dynamic system affected by various time-space constraints. Based on previous studies, a new method of optimizing this dynamic system as a static one is presented. In order to build a generalized and flexible model of the problem, some man-made constraints were investigated in building the mathematic model. Linear programming and simplex method are introduced to solve the optimization problem of earth allocation. A case study in a large-scale rock-fill dam construction project is presented to demonstrate the proposed method and its successful application shows the feasibility and effectiveness of the method. 相似文献
14.
桂显歌 《杨凌职业技术学院学报》2012,11(2):8-10,13
高寒地区混凝土面板堆石坝趾板混凝土对抗冻性有特别高的要求,针对抗冻性F300这一关键性的技术指标对其进行配合比对比试验研究分析,拟合得到28d抗压强度与胶水比的关系式,选择出了既满足性能要求又为经济的配合比。 相似文献
15.
碾压混凝土坝施工工艺简单、工期短、造价低、适应性强,在坝工界得到广泛应用。虽胶凝材料少,水化热低,但由于采用大仓面通仓连续浇筑的施工方式,故碾压混凝土坝的温度裂缝不可忽略。本文通过对碾压混凝土坝温度裂缝的分析,总结了温控防裂的方法,为碾压混凝土坝的设计、施工和防裂提供参考。 相似文献
16.
《天津大学学报(英文版)》2017,(5)
The construction of arch dams exhibits high uncertainty. Sensitivity analysis of construction parameters is important for the design and optimization of dam construction duration. However, current research cannot fully consider the combined influences of multiple parameters on the total construction. To effectively analyze the duration of arch dam construction, this study proposes a global comprehensive sensitivity analysis method in view of the whole process of arch dam construction based on an orthogonal experiment. This method could comprehensively consider the influence of the construction parameters that may lead to the uncertainty of construction duration. In addition, this method is able to identify the key parameters that may have a significant effect on duration uncertainty and sums up the general rules of combined parameters' interaction effect, which provides a scientific basis for reasonable optimization of the duration of dam construction. 相似文献
17.
During the storehouse surface rolling construction of a core rockfilldam, the spreading thickness of dam face is an important factor that affects the construction quality of the dam storehouse' rolling surface and the overallquality of the entire dam. Currently, the method used to monitor and controlspreading thickness during the dam construction process is artificialsampling check after spreading, which makes it difficult to monitor the entire dam storehouse surface. In this paper, we present an in-depth study based on real-time monitoring and controltheory of storehouse surface rolling construction and obtain the rolling compaction thickness by analyzing the construction track of the rolling machine. Comparatively, the traditionalmethod can only analyze the rolling thickness of the dam storehouse surface after it has been compacted and cannot determine the thickness of the dam storehouse surface in realtime. To solve these problems, our system monitors the construction progress of the leveling machine and employs a real-time spreading thickness monitoring modelbased on the K-nearest neighbor algorithm. Taking the LHK core rockfilldam in Southwest China as an example, we performed real-time monitoring for the spreading thickness and conducted real-time interactive queries regarding the spreading thickness. This approach provides a new method for controlling the spreading thickness of the core rockfilldam storehouse surface. 相似文献
18.
随着科技和经济的快速发展,水利水电建设作为我国的基础设施建设也有了长足的进步,与此同时,混凝土重力坝的建设规模愈加复杂和庞大,其稳定性问题成为设计和施工中最为严峻的问题。文章在详细阐述AN-SYS大型通用有限元分析软件的基础上,针对某一混凝土重力坝进行了数值模拟,得出了静力学分析结果,以便于其他同类工程进行参考。 相似文献
19.
The parameters of existing roller-compacted concrete (RCC) dam construction simulation are usually fixed based on experience while the actual construction conditions of an RCC dam change during the process of the project. The simulation accuracy of an RCC dam is therefore reduced because the change has not been considered. A new method for RCC dam construction simulations based on real-time monitoring is presented in this paper. First, real-time monitoring technology is used to collect and analyze the actual construction information. Second, meteorological data obtained from the real-time monitoring system are analyzed using the fuzzy average function method, and the weather conditions of the next stage are forecasted. Then the construction schedule simulation model is updated via the Bayesian update method. Results of the analysis are used as the input to the construction simulation parameters, and the construction simulation is performed. A real-world engineering example is presented to compare the simulation results with the actual construction schedule. The results demonstrate that the method can effectively improve the accuracy and real-time performance of construction simulations. 相似文献
20.
林承岸 《长江工程职业技术学院学报》2011,(4):6-9
通过对小型水库大坝的渗流和稳定进行计算,得出坝体存在渗透破坏和下游坝坡不稳定隐患,需进行加固处理。根据大坝基础地质、坝体填筑材料以及施工质量等条件,选择3种大坝防渗加固方案并进行优选,同时对大坝坝体进行综合整治;经对加固后的坝体稳定进行校核,结果表明大坝除险加固后安全可靠。 相似文献