基于三维定位声发射的轴向加载下灰岩破裂特性研究

金属矿山 ›› 2025, Vol. 55 ›› Issue (8): 48-56.

基于三维定位声发射的轴向加载下灰岩破裂特性研究

程　博¹ 　江东平^2,3 　李龙福^2,3 　王　春^1,2 　谢理想⁴ 　王帅彬¹

1. 河南理工大学能源科学与工程学院,河南焦作 454003;2. 中钢集团马鞍山矿山研究总院股份有限公司,安徽马鞍山 243000; 3. 马鞍山矿山研究院爆破工程有限责任公司,安徽马鞍山 243000; 4. 深部岩体力学与地下工程国家重点实验室,江苏徐州 221116

出版日期:2025-09-15 发布日期:2025-09-15
作者简介:程　博(1999—),男,硕士研究生。
基金资助:
国家自然科学基金项目(编号:52274076);河南省优秀青年科学基金项目(编号:242300421070);“双一流”创建学科相关项目(编号: GCCRC202403)。

Study on the Fracture Characteristics of Limestone under Axial Loading Based on Three-dimensional Positioning Acoustic Emission

CHENG Bo ¹ 　 JIANG Dongping ^2,3　 LI Longfu^2,3　 WANG Chun ^1,2 　 XIE Lixiang ⁴　 WANG Shuaibin ¹

1. School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China; 2. Sinosteel Maanshan General Institute of Mining Research Co. ,Ltd. ,Maanshan 243000,China; 3. Maanshan General Institute of Mining Research Blasting Engineering Co. ,Ltd. ,Maanshan 243000,China; 4. State Key Laboratory of Deep Rock Mechanics and Underground Engineering,Xuzhou 221116,China

Online:2025-09-15 Published:2025-09-15

摘要/Abstract

摘要： 为了研究灰岩在轴向荷载作用下变形过程中内部裂隙的扩展,开展单轴加载试验,同时利用三维定位声发射技术和岩石声波参数测试技术实时监测灰岩的加载过程,结合实时波速与声发射信号的演变规律,揭示试样内部裂隙扩展的历程。研究结果表明:灰岩试样在轴向加载过程中的弹性变形阶段、塑性变形阶段的纵波波速较高, 且在塑性变形阶段波速起伏较大,说明在塑性变形阶段岩样内部的裂隙扩展速度最快;但临近破坏时纵波波速较低。加载过程中声发射信号幅值绝大部分低于 60 dB,高幅值信号会随着试样破坏的来临出现频率增加,且数值整体呈现升高的趋势。试样起裂于内部,裂隙主要围绕着起裂位置扩展至试样边缘。三维定位声发射信号能够反映出灰岩试样在轴向加载过程中其内部裂隙的扩展情况,并且其位置与最终展现的破坏裂纹明显对应。

关键词: 三维定位声发射　裂隙扩展　实时波速　信号幅值　破坏裂纹

Abstract: In order to study the expansion of internal cracks in the deformation process of limestone under axial load,uniaxial loading tests were carried out. At the same time,the loading process of limestone was monitored in real time by using three-dimensional positioning acoustic emission technology and rock acoustic parameter testing technology. Combined with the evolution law of real-time wave velocity and acoustic emission signal,the process of crack propagation in the sample is revealed. The results show that the longitudinal wave velocity of the limestone sample is higher in the elastic deformation stage and the plastic deformation stage during the axial loading process,and the wave velocity fluctuates greatly in the plastic deformation stage,indicating that the crack propagation speed inside the rock sample is the fastest in the plastic deformation stage. However,the longitudinal wave velocity is low when it is close to failure. During the loading process,the amplitude of the acoustic emission signal is mostly less than 60 dB. The high amplitude signal will increase with the frequency of the sample failure,and the value will increase as a whole. The specimen cracks inside,and the cracks mainly extend to the edge of the specimen around the crack initiation position. The three-dimensional positioning acoustic emission signal can reflect the expansion of the internal cracks of the limestone sample during the axial loading process,and its position is obviously corresponding to the final failure crack.

Key words: three-dimensional positioning acoustic emission,crack propagation,real-time wave velocity,signal amplitude, fractured crack

中图分类号:

TU45

程　博　江东平, 　李龙福, 　王　春, 　谢理想　王帅彬. 基于三维定位声发射的轴向加载下灰岩破裂特性研究[J]. 金属矿山, 2025, 55(8): 48-56.

CHENG Bo 　 JIANG Dongping , 　 LI Longfu , 　 WANG Chun , 　 XIE Lixiang 　 WANG Shuaibin. Study on the Fracture Characteristics of Limestone under Axial Loading Based on Three-dimensional Positioning Acoustic Emission [J]. Metal Mine, 2025, 55(8): 48-56.

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