共查询到20条相似文献，搜索用时 109 毫秒
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.
Long tunnel excavation with tunnel boring ily affected by uncertainties and needs to be adjusted machine （TBM） is a complex and stochastic process. It is eas- according to specific geological conditions in different tunnel sections, which makes the construction scheduling and management difficult. Based on the rock mass classification, this paper estimates the penetration rate. Using the rate, a cyclic network simulation （CYCLONE） model of TBM boring system is established, and the advance rates under different geological conditions are determined. Then, the impact of different cutter head thrust, which is chosen in reasonable range according to previous experiences, on pro- ject schedule is analyzed. Moreover, the simulation model of mucking system is built to determine the number of muck trains and rail intersections reasonably, regarding the efficiency of muck loading and material transporting. Based on the interaction and interrelation between TBM boring system and mucking system, the combined CY- CLONE model for the entire tunneling process is established. Then reasonable construction schedule, the utilization rate of working resources, and the probability of project completion are obtained through the model programming. At last, a project application shows the feasibility of the presented method. 相似文献
3.
介绍了利用Delphi7 SQL Server2000开发的基于C/S模式的建筑施工管理系统.该系统主要为项目管理提供材料使用情况、设备使用情况、工程人员的基本情况、工程进度情况以及施工安全状况等信息,以利于现场施工规范化管理. 相似文献
4.
Construction simulation and real-time control for high arch dam 总被引：1，自引：0，他引：1
A method of combining dynamic simulation with real-time control was proposed to fit the randomness and uncertainty in the
high arch dam construction process. The mathematical logic model of high arch dam construction process was established. By
combining dynamic construction simulation with schedule analysis, the process of construction schedule forecasting and analysis
based on dynamic simulation was studied. The process of real-time schedule control was constructed and some measures for dynamic
adjustment and control of construction schedule were provided. A system developed with the method is utilized in a being constructed
hydroelectric project located at the Yellow River in northwest China, which can make the pouring plan of the dam in the next
stage (a month, quarter or year) to guide the practical construction. The application result shows that the system provides
an effective technical support for the construction and management of the dam.
ZHONG Denghua, born in 1963, male, Dr, Prof.
Supported by National Natural Science Foundation of China(No.50539120), National Basic Research Program of China(“973”Program,No.
2007 CB714101), National Science Fund for Distinguished Young Scholars of China(No.50525927), and National Natural Science
Foundation of China (No.50579045). 相似文献
5.
地质雷达勘探方法是应用于隧道掘进中的超前预报,具有快捷、准确的特点。针对如何有效地提高探测精度做了探讨和总结,对工程实例中典型的雷达图像进行分析和判断,并成功预报隧道掌子面前方地质状况,为保障隧道安全施工提供一定依据,也验证了地质雷达的实用性。 相似文献
6.
大伙房输水工程是目前世界上最长的一个隧道工程,整个隧洞的四分之三采用开敞式硬岩掘进机进行施工。针对本工程实际,以循环运行网络模拟理论为基础,建立了隧洞工程掘进机法施工过程模拟模型,并开发了相应模拟计算软件。运用施工过程模拟的方法,对大伙房输水工程出口段可行的11个施工方案进行了模拟研究,运用模糊多属性决策理论对模拟结果进行了优选,得到了最优施工方案。 相似文献
7.
Any tidal defense engineering involves the collection and analysis of massive information about engineering structures and their surrounding environment. Traditional method, which is carried out mainly by means of twodimensional drawings and textures, is not efficient and intuitive enough to analyze the whole project and reflect its spatial relationship. Three-dimensional visual simulation provides an advanced technical means of solving this problem. In this paper, triangular irregular network (TIN) model simplified by non-uniform rational B-splines (NURBS) technique was used to establish the digital terrain model (DTM) of a super large region. Simulation of dynamic water surface was realized by combining noise function with sine wave superposition method. Models of different objects were established with different modeling techniques according to their characteristics. Application of texture mapping technology remarkably improved the authenticity of the models. Taking the tidal defense engineering in the new coastal region of Tianjin as a case study, three-dimensional visual simulation and dynamic roaming of the study area were realized, providing visual analysis and visible demonstration method for the management and emergency decision-making associated with construction. 相似文献
8.
It is difficult to analyze the inter-relationship for the construction layout of a reservoir project scientifically and intuitively.According to the characteristics of broad field and huge information,the modeling methods of digital terrain and solid model as well as the techniques of texture mapping and scene navigation are adopted.The simulation system is developed by C program language,which includes the functions of the interactive navigation of 3D scene,the visual inquiry of project digital model information,the storage and management of project information.A certain reservoir is taken as a case.The 3D visual analysis for the construction layout and engineering information are obtained.The proposed system is of great advantages in dealing with large amount of information and the method provides a theoretical basis and technical support for the construction layout of a reservoir project. 相似文献
9.
GIS-Based Simulation of Engineering Construction Schedule 总被引：1，自引：0，他引：1
For its complexity, engineering construction schedule design is limited by various factors. Simulation-based engineering construction schedule takes critical path method （ CPM ） network as frame and calls complex cyclic operation network （CYCLONE） simulation model enclosed in advance for its simulation nodes. CYCLONE simulation model takes charge of simulating stochastic duration of activity and efficiency of resources, while CPM model performs project scheduling. This combination avoids the shortcomings of both models. Furthermore. geographic information system （ GIS ） technique is utilized to visualize the construction processes which are otherwise difficult to be understood by static results described. Application in practical project verifies the feasibility and advantage of the technique. 相似文献
10.
QI Shen-jun DING Lie-yun LUO Han-bin 《重庆大学学报(英文版)》2007,6(3):177-186
Lean construction has been newly applied to construction industry. The best performance of a project can be achieved through the precise definition of construction product, rational work break structure, lean supply chain, decrease of resources waste, objective control and so forth. Referring to the characteristics of schedule planning of construction projects and lean construction philosophy, we proposed optimizing methodology of real-time and dynamic schedule of construction projects based on lean construction. The basis of the methodology is process reorganization and lean supply in construction enterprises. The traditional estimating method of the activity duration is fuzzy and random;however, a newly proposed lean forecasting method employs multi-components linear-regression, back-propagation artificial neural networks and learning curve. Taking account of the limited resources and the fixed duration of a project, the optimizing method of the real-time and dynamic schedule adopts the concept of resource driving. To optimize the schedule of a construction project timely and effectively, an intellectualized schedule management system was developed. It can work out the initial schedule, optimize the real-time and dynamic schedule, and display the schedule with the Gant Chart, the net-work graph and the space-time line chart. A case study was also presented to explain the proposed method. 相似文献
11.
12.
本文以prenz混沌系统为例,提出了一种基于MATLAB平台的仿真软件Simulink建立混沌系统可视化模型的方法,分析了Lorenz系统的混沌特性,并对Lorenz系统的混沌同步与控制进行了仿真研究。该方法的优点是不需要用传统的程序代码对模型和算法进行编程,而且可以实现混沌系统建模及仿真分析的全程可视化,是研究混沌系统的一种简便、有效的新方法。 相似文献
13.
双护盾掘进机是一种高速、安全、自动化的隧洞工程施工机械,在实际工程中得到了广泛的应用。通过对其循环施工过程的深入研究,建立了双护盾掘进机循环运行网络模拟模型。采用循环运行网络理论,结合计算机模拟技术,开发了双护盾掘进机施工模拟程序。对一个工程实例进行了模拟分析,得到了此施工方案的施工净工期、净成本、掘进机掘进效率。 相似文献
14.
蒋红波 《襄樊职业技术学院学报》2007,6(4):46-49
通过分析工程项目的风险及其对工程进度的影响,对项目进度计划总工期进行了仿真,建立了工程项目计划进度的风险分析模型,获得了工程系统的进度估计,推导出工程总工期的风险分布,并以一个实例加以证明,说明该模型可用于进度风险分析。最后提出了应对进度风险的若干措施。 相似文献
15.
To describe the spatial tendency and complex relationship of geological structures, a digital modeling based on geographic information system and the visualization of hydroelectric engineering geology information are presented. The functions of information visual query, spatial cutting, section drawing, and coupled analysis with hydraulic structures are realized. The geologic model can match the attribute data with the shape data of geological structures, and organize the information for spatial query and analysis of the 3D model. With an application in Laxiwa hydroelectric project on the upriver of Huanghe River, the method provides a 3D parallel section view and query results of geoinformation, and 3D section views of geoinformation along axis of spillway tunnel,and along the 5th axis with underground structures, respectively. 相似文献
16.
何朋立 《洛阳工业高等专科学校学报》2006,16(3):13-15
用有限元强度折减法计算出的安全系数作为评价隧道围岩稳定性的指标,借助于ANSYS程序,使用莫尔-库仑等面积圆屈服准则,计算嵩山隧道的安全系数,通过分析比较确定最优开挖方案;对隧道的开挖支护过程进行数值模拟,分析应力场、位移场、塑性区和支护结构内力变化规律,为隧道工程施工提供理论指导。 相似文献
17.
丁礼建 《石家庄铁路工程职业技术学院学报》2014,(1):32-38
新建铁路隧道下穿既有公路时,既要保证新建铁路隧道施工安全,又要使公路保持运营状态,不产生较大的沉降,因此合理的选择施工方法,对隧道支护结构的安全以及公路路面沉降控制具有很重要的意义。巉以中川隧道下穿天公路工程为工程背景,结合国内外研究成果和国家现有规程,采用数值模拟的方法得出最优的施工方法。 相似文献
18.
基于AutoCAD的水工隧洞开挖断面的自动绘制与量算 总被引：1，自引：0，他引：1
开挖断面的绘制与量算是水工隧洞施工的一项日常性工作,传统方法的劳动强度大、工作效率低.本文介绍了利用AutoCAD制图及二次开发功能,实现水工隧洞开挖断面的自动绘制与量算.该方法应用于工程实践,提高了工作效率. 相似文献
19.
针对当前隧道施工通风教学面临的难题,响应新时代下工科教育发展潮流,把握新工科建设内涵,推进隧道施工通风虚拟仿真实验项目建设。挖掘虚拟仿真平台设计内在需求,介绍了虚拟仿真平台的模块设计和内容设计,以期提升学生的自主学习和实践创新能力。 相似文献
20.
公路隧道塌方是较为常见的工程安全事故,预先进行科学有效的风险评价对于防控隧道塌方风险具有重要意义。根据规范、现有研究和公路隧道工程特点构建了公路隧道塌方风险评价指标体系。针对传统单一赋权风险评价方法会造成评价指标主客观权重被单方面强化的问题,引入博弈论法进行组合赋权以综合主客观权重信息,提出了基于组合赋权和未确知测度理论的公路隧道塌方风险评价模型。采用3 标度层次分析法和熵值法确定评价指标主观权重和客观权重,并运用博弈论法确定评价指标组合权重;结合未确知测度理论得到评价对象的多指标测度综合评价向量,并根据置信度识别准则确定隧道塌方风险等级。将提出的模型应用于福建鱼塘溪隧道4 个典型施工区段风险分析中,得出隧道洞口段塌方风险可能性最高,与现场评估结果基本相符。 相似文献