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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   

2.
土石坝作为一种应用广泛的坝型,近年来得到了迅猛的发展,然而,土石坝存在的坝基渗漏问题一直是工程界探讨的一大课题;本文提出土石坝混凝土防渗墙建设解决土石坝坝基渗漏问题的必要性,重点探讨了土石坝混凝土防渗墙施工质量控制等细节问题。  相似文献   

3.
介绍了土石坝筑坝材料本构模型参数反演计算原理,并采用基于免疫遗传算法的反演方法并结合某面板堆石坝筑坝材料大型现场压缩试验,对该面板坝筑坝材料的E—B模型参数进行反演计算,分析计算结果的合理性,说明此反演结果可以对筑坝材料的室内三轴试验结果进行修正,并为原型大坝的变形与应力分析提供更为可靠的依据。  相似文献   

4.
《治黄科技信息》2008,(2):24-29
1 水资源 菲律宾年平均降水量,吕宋为2583mm。米沙鄢为1933mm,棉兰老为1974mm。 有16座大型坝在运行,15座土石坝和1座混凝土坝。全国所有坝的总库容为8.07km^3。  相似文献   

5.
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   

6.
《治黄科技信息》2005,(2):30-30
巴基斯坦的工程师们正在考虑采取补救措施,以解决塔贝拉坝严重的泥沙淤积问题,该坝高148m,于1977年建成,是当时世界最高的土石坝。  相似文献   

7.
研究表明心墙土石坝水力劈裂发生时,坝壳与心墙的弹模比和心墙的泊松比存在着临界关系.而该关系式为理论计算,缺少实际工程的论证.文章对踏卡河某水电站的心墙上游面的水压力和总应力进行三维有限元分析,得出该水电站水压力小于总应力,不会发生水力劈裂,与利用临界关系式计算结果一致,从而论证临界关系式的正确性.由于该临界条件较三维有限元计算简单方便,可以为心墙土石坝水利劈裂初步设计提供参考.  相似文献   

8.
砌石坝近似混凝土坝,相对土石坝的体积要小,结构也较简单,与混凝土坝相比,砌体所需材料就地开采,可节约大量钢材、木材和水泥。砌石坝在世界上历史悠久,是重要的坝型之一,数量较多。我国是世界上建造最多的国家,据统计坝高15m以上的就有一千多座。这些工程在防洪、发电、灌溉、供水、旅游等方面发挥了巨大作用。在中国的山区,石材比砂土更易获得,砌石坝的数量也更多。  相似文献   

9.
现代经济的发展加快了我国水利工程的建设,同时也对水利工程施工企业提出了更高的要求.针对坝体基础的选择适宜的建设方式是保障水利工程质量及经济效益的关键.作为坝体施工的重要组成部分,土石坝工程是目前水利工程坝体常用建设方式,文中就土石坝工程的施工管理进行了简要的论述.  相似文献   

10.
土石坝作为最受欢迎的坝型应用广泛,随着大型机具及施工技术的发展,使泄洪建筑物布置于坝顶成为可能。通过进行方案比选分析,以工程实例优选出坝顶溢洪道方案,说明坝顶溢洪道在水利工程中应用的优势,并对坝顶溢洪道的特点做了简要介绍,可供同类型的工程项目提供一定的借鉴参考。  相似文献   

11.
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   

12.
Due to the complexity of earthwork allocation system for the construction of high concrete face rockfill dam,traditional allocation and planning are not able to function properly in the construction process with strong randomness.In this paper,the working mechanism of earthwork dynamic allocation system is analyzed comprehensively and a solution to fuzzy earthwork dynamic allocation is proposed on the basis of uncertain factors in the earthwork allocation of a hydropower project.Under the premise of actual situation and the experience of the construction site,an all-coefficient-fuzzy linear programming mathematical model with fuzzy parameters and constraints for earthwork allocation is established according to the structure unit weighted ranking criteria.In this way,the deficiency of certain allocation model can be overcome.The application results indicate that the proposed method is more rational compared with traditional earthwork allocation.  相似文献   

13.
This paper deals with the estimation of crest settlement in a concrete face rockfill dam (CFRD), utilizing intelligent methods. Following completion of dam construction, considerable movements of the crest and the body of the dam can develop during the first impoundment of the reservoir. Although there is vast experience worldwide in CFRD design and construction, few accurate experimental relationships are available to predict the settlement in CFRD. The goal is to advance the development of intelligent methods to estimate the subsidence of dams at the design stage. Due to dam zonifieation and uncertainties in material properties, these methods appear to be the appropriate choice. In this study, the crest settlement behavior of CFRDs is analyzed based on compiled data of 24 CFRDs constructed during recent years around the world, along with the utilization of gene ex- pression programming (GEP) and adaptive neuro-fuzzy inference system (ANFIS) methods. In addition, dam height (H), shape factor (St), and time (t, time after first operation) are also assessed, being considered major factors in predicting the settlement behavior. From the relationships proposed, the values ofR2 for both equations of GEP (with and without constant) were 0.9603 and 0.9734, and for the three approaches of ANFIS (grid partitioning (GP), subtractive clustering method (SCM), and fuzzy c-means clustering (FCM)) were 0.9693, 0.8657, and 0.8848, respectively. The obtained results indicate that the overall behavior evaluated by this approach is consistent with the measured data of other CFRDs.  相似文献   

14.
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   

15.
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   

16.
通过实例介绍高压喷射灌浆技术在土石坝加固中的应用和改进。  相似文献   

17.
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   

18.
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   

19.
The paper is to design and construct a coupled elasto-plasticity damage constitutive model for concrete. Based on the energy dissipation principle, the Hsieh-Ting-Chen four-parameter yield function is used. The model can reflect different strength characteristics of concrete in tension and compression, and reduce the limitation and lacuna of the traditional damage constitutive models for concrete. Furthermore, numerical test for concrete stress-strain relation under uniaxial tension and compression is given. Moreover, the damage process of concrete gravity dam is calculated and analyzed in seismic load. Compared with other damage constitutive models, the proposed model contains only one unknown parameter and the other parameters can be found in the Hsieh-Ting-Chen four-parameter yield function. The same damage evolution law, which is used for tension and compression, is good for determining stress-strain constitutive and damage characteristics in complex stress state. This coupled damage constitutive models can be applied in analyzing damage of concrete gravity dam and arch dam.  相似文献   

20.
混凝土重力坝的实用剖面优化设计是根据安全、经济和强度要求。通过分析计算,选择一个既使体积最小·又使施工方便的剖面形态和轮廓尺寸。本文建立了混凝土重力坝结构优化设计的数学模型和优化设计的VB软件,并应用该软件对工程实例进行了优化设计,结果证明该优化设计方法及软件具有较好的工程实用性。  相似文献   

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