平行断裂砂岩的断裂传播特征和故障机制
Fengpu Liu1, Baoxin Jia2,3, Zhiyang Zhou1
1School of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China.
Scientific reports
|April 24, 2025
概括
研究破裂岩石揭示了断裂间距影响裂聚合类型,而断裂数量影响多样性. 声波发射的多分体参数可以预测岩石断裂事件.
科学领域:
- 岩石机械 岩石机械 岩石机械
- 地质技术工程地质技术工程
- 材料科学是一种材料科学.
背景情况:
- 了解岩石断裂机制对于地质和工程应用至关重要.
- 破裂岩石在压力下表现出复杂的行为,这是由于先前存在的不连续性.
- 声波发射 (AE) 技术为岩石损伤演变提供了洞察力.
研究的目的:
- 调查断裂间距和数量对砂岩机械性能和断裂机制的影响.
- 分析岩石裂变期间声辐射 (AE) 完全动态的时间变化的演变.
- 通过AE多分体参数识别岩石裂变的潜在前体.
主要方法:
- 在具有受控断裂配置的砂岩样本上进行单轴压缩试验.
- 离散元素数值模拟以建模岩石行为.
- 声波发射检测技术用于在测试期间监测微地震事件.
主要成果:
- 弹性模量与骨折数量相关;峰值强度没有明显的相关性.
- 断裂间距决定了裂聚合的类型,而断裂数量影响了聚合的多样性.
- 穿过桥的剪切裂是常见的,影响裂的启动,损伤机制和标本的整体强度.
- 在张力和剪切裂之间存在相互激发,裂之前的比例突然增加.
- 在AE多分法参数 (Δα,Δf(α)) 中的突然变化表明即将发生的宏观失效.
结论:
- 平行断裂的数量和间距显著改变了砂岩的机械反应和故障模式.
- 声波发射多分体分析提供了一种可靠的方法,用于短期预测岩石破裂.
- 了解这些关系对于评估各种工程项目中岩石质量的稳定性至关重要.
更多相关视频
09:00Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
Published on: September 29, 2019
13.2K
06:55Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
Published on: August 5, 2016
8.1K
相关概念视频
01:23Behavior of Concrete Under Compressive Load
121
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
121
01:24Stress-Strain Diagram - Brittle Materials
912
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...
912
01:20Microcracking in Concrete
87
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
87
01:21Fatigue
166
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
166
01:27Fractures: Bone Repair
2.8K
Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
2.8K
01:22Fatigue Strength of Concrete
138
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
138