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相关概念视频

Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

79
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
79
Quarrying of Stone01:15

Quarrying of Stone

109
Quarrying is the process of extracting stone from a quarry, where specialized techniques are employed to remove large blocks of stone safely and efficiently. This process can involve controlled explosions or more precision-oriented methods such as cutting and drilling.
One common method involves using a diamond belt saw to cut large blocks from the quarry face. These blocks can be about 50 feet long and 12 feet high. After the initial vertical cut, drilling is performed at the base of the...
109
Design Example: Maintaining Level of an Embankment01:19

Design Example: Maintaining Level of an Embankment

61
Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
61
Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

95
Preplaced aggregate concrete is ideal for construction environments that are not easily accessible. The process begins by properly wetting the gap-graded coarse aggregates to remove the dirt, then placing it in the form and compacting it. Voids are filled with a mortar mix pumped under pressure through slotted pipes. This mortar typically consists of Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan helps reduce bleeding and segregation while improving the...
95
Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

164
Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
164
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

43
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
43

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相关实验视频

Updated: Jun 23, 2025

Project-Based Learning Guidelines for Health Sciences Students: An Analysis with Data Mining and Qualitative Techniques
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采矿 LDA 关于建筑工程变化风险的主题基于分级证据.

Lianghai Jin1,2,3,4, Chenxi Li1,2, Zhongrong Zhu1,2,4

  • 1Hubei Key Laboratory of Hydro-Power Construction and Management, China Three Gorges University, Yichang, Hubei, China.

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概括

本研究引入了一种新方法,通过对证据可靠性的分级来管理工程变化 (EC) 风险. 包括设计缺陷在内的技术风险被确定为最重要的EC风险.

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科学领域:

  • 工程管理工程管理工程管理
  • 风险管理 风险管理
  • 信息科学 信息科学 信息科学

背景情况:

  • 工程变更 (EC) 风险可能会对项目结果产生负面影响,包括时间表,成本,质量和利益相关者的满意度.
  • 当前的EC风险管理方法往往缺乏可靠的证据选择,并没有充分考虑证据的质量和可靠性.
  • 证据分类对于EC风险管理中可靠的决策至关重要,提供科学和可靠性支持.

研究的目的:

  • 开发一种方法来识别和优先考虑与建筑工程变化 (EC) 相关的潜在风险.
  • 通过将证据分级与主题分析相结合,提高EC风险管理的可靠性.

主要方法:

  • 提出了一种结合证据分级理论和隐性迪里克莱特分配 (LDA) 主题分析的方法.
  • 用基于证据的分级理论将EC风险的证据来源分为三个可信度级别.
  • 使用LDA主题建模分析了更高可信度的证据,通过专家调查确定了EC风险主题,因素和关键风险.

主要成果:

  • 确定了五个突出的EC风险主题:合同,技术,资金,人员和其他危险.
  • 技术风险成为欧盟风险中最重要的类别.
  • 确定的主要风险包括工程设计缺陷,错误和遗漏.

结论:

  • 拟议的方法有效地识别和优先考虑EC风险,利用证据分类和LDA主题分析.
  • 了解EC风险的层次和性质,特别是技术风险,对于有效的项目管理至关重要.
  • 可靠的证据评估对于减轻工程变化的负面影响至关重要.