关于岩石质量扩张和应力值在装卸过程中的变化定律的研究
Yanhong Du1, Laigui Wang2, Feng Chen2
1School of Mechanics and Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning, China. duyanhong1209@sina.com.
Scientific reports
|December 3, 2025
概括
这项研究使用三轴压缩和卸载测试来研究岩石扩张. 它揭示了扩张主要发生在后期阶段,在加速和绝对扩张下,体积应变比例显著增加.
科学领域:
- 地质技术工程 地质技术工程
- 岩石机械学 岩石机械学
- 材料科学 是一种材料科学.
背景情况:
- 岩石膨胀是一种影响岩石质量在压力下行为的关键现象.
- 了解扩张对于预测岩石破裂和稳定性至关重要.
- 现有的模型需要改进,以充分捕捉扩张阶段和相关的骨折演变.
研究的目的:
- 在三轴压缩和卸载条件下的粗砂岩中研究扩张现象.
- 将岩石膨胀过程根据应力-应变行为划分为不同的阶段.
- 分析断裂演变,并提出狭窄和普遍扩张的新概念.
主要方法:
- 传统的三轴压缩测试和卸载限制压力测试是在粗砂岩上进行的.
- 分析了偏差应力-应变曲线,以确定扩张阶段.
- 用数值模拟来研究不同扩张阶段的断裂演变.
- 一个双线扩张模型被用来分析明显扩张角度和扩张指数.
主要成果:
- 该研究确定了四个扩张阶段:线性弹性,缓慢相对,加速相对和绝对扩张.
- 在两种测试类型中,随着限制压力的增加,明显的扩张角度显著下降.
- 特征性应力值 (裂纹启动,损伤,峰值强度) 随着限制压力而增加.
- 扩张应变随着限制压力的增加而减少,在卸载后观察到更大的体积应变.
结论:
- 岩石膨胀主要发生在加速的相对膨胀和绝对膨胀阶段,占体积应变的76.73%.
- 拟议的狭窄 (绝对) 和通用 (相对) 扩张的概念为分析提供了一个框架.
- 限制压力显著影响扩张性行为,15MPa被确定为扩张性指数的关键分界点.
- 这项研究提供了一种有效的方法来分析岩石膨胀现象.
相关概念视频
01:18Residual Stresses in Bending
500
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
500
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
528
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
528
01:22Generalized Hooke's Law
2.5K
The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
2.5K
01:24Stress-Strain Diagram - Ductile Materials
1.9K
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
1.9K
01:21Plastic Behavior
500
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
500
01:26Hooke's Law
1.4K
Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
1.4K