Related Experiment Video
Updated: Sep 18, 2025
10:36
Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction
Published on: May 20, 2018
9.8K
Rockburst grade evaluation and parameter sensitivity analysis based on SSA-PNN framework: Considering rock mass
Xiaoyan Zhou1, Yimin Jiang1, Zhenyi Wang1
1School of Architectural Engineering, Zhengzhou University of Industrial Technology, Zhengzhou, China.
Plos One
|June 24, 2025
Summary
Rockburst prediction accuracy is enhanced using a Sparrow Search Algorithm (SSA) and Probabilistic Neural Network (PNN) model. This framework effectively evaluates rockburst grades by analyzing key rock mass parameters for tunnel safety.
Area of Science:
- Geotechnical Engineering
- Rock Mechanics
- Computational Intelligence
Background:
- Rockbursts pose significant risks in underground excavations, influenced by rock mass strength and stress conditions.
- Accurate rockburst grade evaluation is crucial for ensuring the safety and stability of tunnels.
Purpose of the Study:
- To develop and validate a novel rockburst grade evaluation system using advanced computational methods.
- To analyze the sensitivity of different rock mass parameters to rockburst occurrences.
Main Methods:
- Collected rock mass strength and stress data from 22 rockburst locations in the Lalin Railway tunnel.
- Utilized Sparrow Search Algorithm (SSA) to optimize parameters for a Probabilistic Neural Network (PNN).
- Constructed an SSA-PNN framework for rockburst grade evaluation and sensitivity analysis.
Main Results:
- The SSA-PNN framework demonstrated efficient and reliable rockburst grade evaluation.
- Maximum tangential stress and uniaxial compressive strength of rock mass were identified as the most influential parameters.
- Maximum in-situ stress and uniaxial compressive strength of rock showed lesser, but still relevant, influence.
Conclusions:
- The integrated SSA-PNN approach provides a highly reliable method for rockburst grade evaluation.
- The findings offer valuable insights for selecting critical parameters in rockburst assessment.
- This study contributes to improved safety measures in tunnel engineering projects prone to rockbursts.
Related Concept Videos
01:22Toughness and Hardness of Aggregate
347
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...
347
01:22Design Consideration
333
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...
333
01:12Bonding and Strength of Aggregate
265
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
265
01:12Non-destructive Tests for Concrete Strength
195
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
195
01:18Mechanical Characteristics of Steel
769
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
769
01:24Stress-Strain Diagram - Brittle Materials
2.8K
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
2.8K