充填物对双圆倾斜孔洞岩石试样力学性能和破裂特征的影响

潘燕秋; 罗许林; 王国柱

doi:10.13204/j.gyjzG22062201

充填物对双圆倾斜孔洞岩石试样力学性能和破裂特征的影响

doi: 10.13204/j.gyjzG22062201

1. 郑州工业应用技术学院建筑工程学院, 郑州 451150;
2. 中国矿业大学深部岩土力学与地下工程国家重点实验室, 江苏徐州 221116

基金项目:

国家自然科学基金项目（51674100，51304067）。

详细信息

作者简介:
潘燕秋,女,1989年出生,硕士,讲师。电子信箱:15903686960@163.com

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- 文章访问数: 43
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- 被引次数: 0
出版历程
- 收稿日期: 2022-06-22
- 网络出版日期: 2023-10-17

Influence of Fillers on Mechanical Properties and Fracture Characteristics of Rock Specimens with Double Circular Inclined Cavities

1. School of Architectural Engineering, Zhengzhou University of Industrial Technology, Zhengzhou 451150, China;
2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China

摘要

摘要: 为研究充填物对双圆倾斜孔洞岩石试样力学性能和破裂特征的影响，采用离散元软件PFC^2D对不同倾角下包含不同强度双圆形充填物的岩石试样进行单轴压缩数值模拟。结果表明：充填物强度和倾角对岩石强度和变形特性有不同程度的影响，随着充填物强度的提高，倾角的影响逐渐减弱。当充填系数λ为0.6时，表现出最优的孔洞岩石加固效果，当充填系数大于0.6时，所有倾角试样的强度几乎保持恒定，并且所有倾角试样在充填孔洞之间均未表现出裂纹聚集现象。岩石试样的破坏过程可以用声发射计数、累计声发射计数和定位图进行表征。不同强度充填物试样的最终破坏模式可分为拉伸剪切混合破坏和剪切破坏。缺陷之间的裂纹聚集模式可分为未聚集、剪切聚集和拉伸剪切混合聚集。
- 双圆倾斜孔洞 /
- 充填物强度 /
- 单轴压缩 /
- 力学性能 /
- 破裂特征 /
- 声发射
Abstract: To study the influence of fillers on the mechanical properties and fracture characteristics of rock specimens with double inclined cavities, the numerical simulation of uniaxial compression was performed by discrete element software PFC^2D on rock specimens with double circular cavities filled with different strength fillers at different inclinations. The results indicated that the strength and inclination of fillers had different effects on the strength and deformation characteristics of rock. With the increase of the strength of fillers, the influence of inclinations was gradually weakened. When the filling coefficient λ was 0.6, the reinforcement effect for specimens with inclined cavities was best. When the filling coefficient was greater than 0.6, the strengths of all specimens with indined cavities were almost constant, and all the specimens did not present crack aggregation phenomena between cavities. The failure process of spcimens could be characterized by acoustic emission counting, cumulative acoustic emission counting and location maps. The final failure modes of specimens with different filler strengths could be divided into tensile-shear mixed failure and shear failure. The crack aggregation modes between defects could be divided into non-aggregation, shear aggregation and tensile-shear mixed aggregation.
- double circular inclined cavity /
- strength of filler /
- uniaxial compression /
- mechanical property /
- fracture characteristic /
- acoustic emission

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