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相关概念视频

Quarrying of Stone01:15

Quarrying of Stone

104
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...
104
Toughness and Hardness of Aggregate01:22

Toughness and Hardness of Aggregate

249
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
249
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

156
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
156
Unsoundness of Aggregate due to Volume Change01:26

Unsoundness of Aggregate due to Volume Change

98
Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
98
Design Example: Dimensioning of Concrete Masonry Construction01:13

Design Example: Dimensioning of Concrete Masonry Construction

92
For the construction of a storeroom using concrete masonry units, it's essential to align the dimensions of the structure with the actual sizes of the blocks and the intended mortar joints. On the site in question, there's a stockpile of concrete masonry blocks with a nominal size of eight by eight by sixteen inches, which are to be used in the construction of the storeroom.
The site engineer has laid out a plan for the storeroom with external dimensions of twelve feet in length and...
92
Deleterious Substances in Aggregate01:25

Deleterious Substances in Aggregate

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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...
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相关实验视频

Updated: Jun 13, 2025

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
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开发尺寸石头采石场风险评估方法.

Mojtaba Yari1, Saeed Jamali2,3, Gamil M S Abdullah4,5

  • 1Department of Mining Engineering, Faculty of Engineering, Malayer University, Malayer, Iran. m.yari.academic@gmail.com.

Scientific reports
|September 16, 2024
PubMed
概括
此摘要是机器生成的。

大尺寸石头采石面临着重大的危险. 本研究详细介绍了风险细分结构,并使用VIKOR方法来确定大理石矿山中最具威胁性的经济,管理和时间表风险.

关键词:
维度石头是一个维度石头.模糊的AHP-AHP可以使用.迷糊的维科尔 (VIKOR)储备银行 储备银行 储备银行风险评估 风险评估 风险评估

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科学领域:

  • 采矿工程 采矿工程 采矿工程
  • 风险管理 风险管理
  • 地质科学 地质科学

背景情况:

  • 在过去的20年中,全球石材产量急剧增长,七个国家主导了产量.
  • 采矿业务,特别是尺寸石采矿,本身具有危险性,需要进行严格的风险评估.
  • 现有的风险评估框架需要适应维度岩石采石的独特复杂性.

研究的目的:

  • 开发一个全面的风险分类结构 (RBS),专门用于尺寸石.
  • 通过使用多属性决策方法来优先考虑已识别的风险.
  • 为了评估一个案例研究中的主要风险,大理石矿.

主要方法:

  • 制定了详细的风险细分结构,包括17个主要级别和128个子级别.
  • 采用多属性决策方法来处理风险参数识别的复杂性.
  • 在 Fuzzy 环境中应用了 VIKOR 方法,以考虑 Ghasre Dasht 大理石矿的风险优先级,考虑了 10 个参数.

主要成果:

  • 该研究建立了尺寸石采矿操作的细粒度风险结构.
  • 经济,管理和时间表风险被确定为最关键的威胁.
  • 在模糊条件下的案例研究中,VIKOR方法有效地对风险进行了优先排序.

结论:

  • 风险评估的结构化方法对于维度石采石场的安全性和效率至关重要.
  • 经济,管理和时间表因素代表了需要缓解策略的最高优先级风险.
  • 开发的RBS和应用的决策方法为维度石行业的风险管理提供了有价值的框架.