Related Experiment Video
Updated: Jan 8, 2026
10:27
A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
Published on: June 12, 2019
9.1K
Structural model of hard overburden shell in thick coal seam and its application
Xing Fu1,2, Lingjun Zeng3, Hai Rong3
1Ordos Research Institute of Liaoning Technical University, Ordos, 017000, China. 15841815399@163.com.
Scientific Reports
|December 13, 2025
Summary
This study analyzes hard overburden movement in extra-thick coal seams using key stratum theory. It reveals the mechanism behind mine pressure phenomena, providing a basis for pressure control in the Datong mining area.
Area of Science:
- Mining Engineering
- Geotechnical Engineering
- Rock Mechanics
Background:
- Focuses on mining extra-thick coal seams with Carboniferous hard overburden in the Datong mining area.
- Addresses challenges in fully-mechanized caving mining of 3-5# extra-thick coal seams.
Purpose of the Study:
- Analyze hard overburden movement characteristics in extra-thick coal seams.
- Determine the ultimate span of the cylindrical shell structure of hard overburden.
- Reveal the mechanism of special mine pressure phenomena.
Main Methods:
- Utilizes key stratum theory to analyze overburden movement.
- Applies elastic plate theory to establish mechanical and mathematical models.
- Calculates the ultimate span of the cylindrical shell structure.
Main Results:
- The limit span of sub-key stratum II is 65.11 m, and the main key stratum is 222.77 m for the 8105 working face.
- Calculation results align with observed mine pressure behavior.
- The mechanism of periodic weighting, large mining influence range, and impact loads is explained.
Conclusions:
- Provides a theoretical basis for mine pressure control in Carboniferous hard overburden and extra-thick coal seam mining.
- The study's findings are applicable to the Datong mining area.
- Understanding overburden behavior is crucial for safe and efficient mining operations.
Related Concept Videos
01:15Thin-Walled Hollow Shafts
514
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
514
01:22Toughness and Hardness of Aggregate
566
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...
566
01:28Internal Loadings in Structural Members: Problem Solving
1.7K
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...
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...
1.7K
01:21Mechanistic Models: Overview of Compartment Models
333
Mechanistic models, a category encompassing both physiological and compartmental modeling, differ from empirical models' approaches to incorporating known factors about the systems being modeled. Empirical models describe data with minimal assumptions, while mechanistic models aim to provide a robust description of available data by specifying assumptions and integrating known factors about the system. Compartmental analysis is a key example of a mechanistic model in pharmacokinetics and...
333
01:22Design Consideration
508
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...
The factor of safety is another key...
508
01:18Saint-Venant's Principle
1.3K
The principle of Saint-Venant postulates that the stress distribution within a structural member does not rely on the precise method of load application except in the vicinity of the load application points. Consider a scenario where loads are centrally applied on two plates. In this case, the plates move toward each other without any rotation. This movement causes the member to contract in length and expand in width and thickness. Uniform deformation across all elements and maintaining...
1.3K