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相关概念视频

Method of Superposition01:20

Method of Superposition

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The method of superposition is a crucial technique in structural engineering, used to analyze the effect of multiple loads on beams. This approach involves calculating the deflection and slope for each load on a beam separately, and then summing these effects to determine the overall impact. It is applicable only when the beam material remains within its elastic limit, ensuring that deformations are linearly elastic.
When applying the method of superposition, each type of load—whether...
1.2K
Types of Aggregate Grading01:15

Types of Aggregate Grading

800
Aggregate grading is crucial in economically obtaining a concrete mix with adequate strength, reasonable workability, and minimal segregation. There are four types of aggregate gradation: well-graded, uniformly (or one-sized) graded, gap-graded, and open-graded.
Well-graded aggregates include a complete range of necessary size fractions that fit together to create a dense matrix with minimal voids, represented by a smooth, continuous gradation curve. This type of grading ensures good...
800
Design Consideration01:22

Design Consideration

321
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
321
Elevation of Intermediate Points on Vertical Curves01:20

Elevation of Intermediate Points on Vertical Curves

69
Vertical curves are essential in roadway design because they provide smooth transitions between varying roadway grades. Designing vertical curves involves calculating intermediate elevations and identifying the curve's highest or lowest point, which is essential for optimal roadway performance.Intermediate elevations on a vertical curve are determined using the tangent offset method. This method considers the initial elevation at the start of the curve, the grades, and the curve's geometry. The...
69
Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

1.4K
When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal...
1.4K
Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

168
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
168

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相关实验视频

Updated: Sep 12, 2025

Determination of the Friction Coefficients of Icy Pavements Under Different Amounts of Snowfall
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路面屋顶稳定性分级方法基于多指数优化优化方法.

Xiaoqiang Xue1, Wei Du1, Jian Cui2

  • 1Shaanxi Xiaobaodang Mining Co., Ltd., Yulin, 719000, China.

Scientific reports
|August 9, 2025
PubMed
概括
此摘要是机器生成的。

一种新方法对道路岩石稳定性进行了分级,以优化支设计. 深度和屋顶强度等关键因素影响稳定性,BP神经网络模型在分类中达到91%以上的准确性.

关键词:
在BP神经网络中,神经网络钻孔数据 钻孔数据煤炭矿安全工作人员围稳定性分类 围稳定性分类阶层分析方法 阶层分析方法.数字模拟 数字模拟

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科学领域:

  • 采矿工程 采矿工程 采矿工程
  • 地质技术工程 地质技术工程
  • 岩石机械 岩石机械

背景情况:

  • 目前的道路支持策略往往是统一的,导致不稳定区域的压力问题和稳定区域的过度支持.
  • 需要一个可靠的岩石质量分类系统,以便在整个道路上定制支持设计.
  • 该研究侧重于小宝第1号煤矿,以应对这些挑战.

研究的目的:

  • 开发和验证一种可靠的方法来分类道路周边岩石的稳定性.
  • 实现差异化和优化的支持设计,以提高道路安全和效率.
  • 为采矿业务的后续差异化支持策略提供理论参考.

主要方法:

  • 使用SPSS和等级分析方法进行数据分析,以确定十个影响因素的权重.
  • 基于权重影响因素和规范钻井数据的岩石稳定性分类公式的开发.
  • 构建和训练用于道路屋顶稳定性分类的反向传播 (BP) 神经网络模型.

主要成果:

  • 确定了影响屋顶稳定的五个关键因素:道路深度,屋顶强度,直接屋顶厚度,采矿高度和岩石完整性.
  • BP神经网络模型实现了高精度:92.8%的训练组和91.7%的测试组.
  • 矿井压力数据验证了模型的分类,显示了与稳定性水平相对应的明显变化,数值模拟表明易崩的区域的应力更高.

结论:

  • 拟议的岩石稳定性分类方法,利用BP神经网络,为差异化道路支持提供了可靠的方法.
  • 了解关键地质和采矿参数的影响对于有效的支持设计至关重要.
  • 根据应力分析,在被确定为高度容易发生屋顶倒塌的地区,需要加强支持.