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1.
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
2.
随着施工技术的飞速发展,混凝土面板堆石坝已经成为现代水利枢纽工程的主要坝型之一。渭南市涧峪水库在堆石面板坝的施工中,采用了先进的挤压式混凝土边墙施工技术,提高了施工质量,为同类工程施工积累了宝贵的经验。 相似文献
3.
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
4.
Time, cost, and quality are three key control factors in rockfill dam construction, and the tradeoff among them is important. Research has focused on the construction time-cost-quality tradeoff for the planning or design phase, built on static empirical data. However, due to its intrinsic uncertainties, rockfill dam construction is a dynamic process which requires the tradeoff to adjust dynamically to changes in construction conditions. In this study, a dynamic time-cost-quality tradeoff (DTCQT) method is proposed to balance time, cost, and quality at any stage of the construction process. A time-cost-quality tradeoff model is established that considers time cost and quality cost. Time, cost, and quality are dynamically estimated based on real-time monitoring. The analytic hierarchy process (AHP) method is applied to quantify the decision preferences among time, cost, and quality as objective weights. In addition, an improved non-dominated sorting genetic algorithm (NSGA-II) coupled with the technique for order preference by similarity to ideal solution (TOPSIS) method is used to search for the optimal compromise solution. A case study project is analyzed to demonstrate the applicability of the method, and the efficiency of the proposed optimization method is compared with that of the linear weighted sum (LWS) and NSGA-II. 相似文献
5.
A real-time monitoring and 3D visualization analysis system is proposed for dam foundation curtain grouting. Based on the real-time control technology, the optimization method and the set theory, a mathematical model of the system is established. The real-time collection and transmission technology of the grouting data provides a data foundation for the system. The real-time grouting monitoring and dynamic alarming method helps the system control the grouting quality during the grouting process, thus, the abnormalities of grouting, such as jacking and hydraulic uplift, can be effectively controlled. In addition, the 3D grouting visualization analysis technology is proposed to establish the grouting information model (GIM). The GIM provides a platform to visualize and analyze the grouting process and results. The system has been applied to a hydraulic project of China as a case study, and the application results indicate that the real-time grouting monitoring and 3D visualization analysis for the grouting process can help engineers control the grouting quality more efficiently. 相似文献
6.
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
7.
构建中小学教师教育技术能力培训质量保障体系,是提高培训质量的基础和前提条件。文章从近几年笔者参加的四川省中小学教师教育技术能力培训实际出发,分析影响中小学教师教育技术能力培训质量的主要因素,构建了以评价和培训过程监控为核心的质量保障体系。 相似文献
8.
YANG Ming-yu LI Bai-zhan Li Nan LIANG Jing 《重庆大学学报(英文版)》2005,4(3):144-148
1 Introduction 1 In recent years there is a growing understanding of the importance of effective design management to facilitate a coordinated building design within budget, and to ensure the smooth operation of a project [1]. Therefore, it becomes a certain tendency that management of construction design project should combine with information technology (IT) to approach information share and process integration. Since the application of computer-aided design technology (CAD) in China at la… 相似文献
9.
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
10.
改革开放以来,我国基础教育质量监测与评价体系经历了以督导评估为依托的萌芽期(1978—2001)、开展教育质量监测的探索和试点期(2002—2014)和监测与评价体系的建设和完善期(2015至今)三个阶段。尽管在价值定位、监测内容、组织实施、结果应用、运行体系等方面取得了一些基本经验,但同时在监测与评价体系建设中也存在一些问题和挑战。基于对历史演进、基本经验和现存问题的分析,基础教育质量监测与评价体系的未来走向需要全面体现和贯彻党的教育方针、宏观调控教育督导定位以发挥监测职能、从监测机构设立走向各级监测体系的内涵建设,并推动信息技术与监测评价的深度融合。 相似文献
11.
汽车运用技术专业项目化课程体系的构建与实施 总被引：2，自引：0，他引：2
在汽车运用技术专业建设过程中,南京交通职业技术学院引入课程群的概念,构建以职业岗位能力培养为核心,以工作过程为导向的项目化课程体系,把全部课程根据能力培养要求分成基本素质群、专业基本技能群和岗位能力群三个大群.课程体系实施采用"1+1+0.25+0.75"四段式学习模式.为保证课程实施,建设一体化教室,配置为完成学习领域所需的全部教学资料,制定"学习工作单"供学生自我检查和自我训练使用. 相似文献
12.
陈汝冰 《中国现代教育装备》2014,(9):99-100
以国际视野下的教师信息化能力概念为基础,分别按结构、功能对教师信息化教学能力的内涵挖掘,揭示职业院校教师信息化教学能力的固有特点。从偏远地区职业院校教师信息素养的现状和少数民族地区教师信息化能力发展影响因素着眼,构建职业院校教师信息化教学能力指标体系,其指标体系具有科学性、规范性、灵活性、本土性、人本性等特点。 相似文献
13.
幼儿教师数学核心经验主要是指教师在教学实践中形成的数学领域至关重要的概念、能力或技能,对于幼儿的数学学习和教师的数学教学具有至关重要的作用。幼儿教师作为基本的学习者,其专业发展过程符合学习进阶的各项准则,不同职业发展阶段的幼儿教师有着各自不同的进阶轨迹。学习进阶强调学习是一种不断积累和发展的过程,并倡导为不同阶段的学习者设计不同的进阶框架,这为有效推动幼儿教师数学核心经验的发展提供了充分的理论参考。本研究在厘清幼儿教师数学核心经验内涵与结构的基础上,依据学习进阶的主要观点,建构幼儿教师数学核心经验的经验模型,并提出相应的教师培养策略,主要包括加强数学核心经验的学习共同体建设、制订数学核心经验的阶梯式成长方案和完善数学核心经验的质量监测指标。 相似文献
14.
徐广舒 《南通职业大学学报》2012,26(4):44-45,49
信息时代网络技术已成为各学科课程整合的有力工具,而加强专业群课程建设则是＂十二五＂期间高职院校提高人才培养质量的重要内容之一。文章在分析建筑工程专业群各专业核心岗位的基础上,通过构建专业群课程体系,探究了专业群课程信息资源库的建设和网络环境下课程的教学改革模式。 相似文献
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16.
The quality of compaction is key to the safety of dam construction and operation. However, because of incomplete information about the construction process and the unknown relationship between compaction quality and the factors that influence it, traditional evaluation methods such as neural networks and multivariate linear regression models fail to take uncertainty fully into account. This paper proposes a cloud-fuzzy method for assessing compaction quality by considering randomness, fuzziness, and incomplete information. The compaction parameters and material source parameters are the key parameters in the assessment of compaction quality. A five-layer neural-network model of compaction quality assessment is established that considers compacted dry density and its classification membership and probability as the criteria, and the rolling speed, rolling passes, and compacted layer thickness as alternatives. Because of uncertainties in the criteria and alternatives, the cloud-fuzzy method, in which a fuzzy neural network is extended with a cloud model to handle uncertain and fuzzy problems more effectively, is introduced to determine the compaction quality. A case study is presented to evaluate the compaction quality of a hydropower project in China. The results indicate that the cloud-fuzzy model is feasible in relation to precision and makes up for the sole focus on precision by traditional methods. The proposed method provides a triple index for understanding compaction quality, which facilitates assessment of the compaction quality of an entire dam surface. 相似文献
17.
在传统教学评价过程中,软件工程与相关专业的教学评价目标及方法单一,强调理论教学,存在毕业生综合素质不强的问题。同时随着信息技术的发展,人才培养目标与高校教学质量评估之间出现了脱节现象。针对这一问题,以教学评价过程为研究对象,以建立评价体系为研究内容,引入云模型技术,以解决评估过程中信息不确定的问题。最后以软件工程专业为例,提出一种基于云模型的评估方法。该研究成果可以加强信息技术与教育技术的融合,为教学评价等应用提供理论基础与关键技术支撑,从而提升软件工程专业人才培养质量。 相似文献
18.
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
19.
为进一步提升我国船舶制造企业生产管理水平,实现生产全过程监控,提高造船效率,提出一种基于数字孪生理论的精细化造船工时管理模式,通过建立二维三维数字孪生模型、系统架构和数据映射逻辑结构,在生产计划、监控通讯设备及企业知识的助力下,实现生产数据实时信息共享及人员、设备、材料有效集成。试验结果表明,数字孪生技术的运用使返工率降低17.6%,修正吨位提高12.4%。基于数字孪生驱动的造船精细化工时管理模式完成了数字化、集成化、智能化、标准化的工时管理信息系统构建,可降低生产管理成本,提高生产效率,提升造船企业核心竞争力。 相似文献
20.
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