三峡大学学报（自然科学版）2025，Vol.47Issue(2)：33-40,8.DOI:10.13393/j.cnki.issn.1672-948X.2025.02.005
基于声发射技术的白云岩多级循环荷载损伤特性研究
Study on the Damage Characteristics of Dolomite with Multi-Stage Cyclic Loading Based on Acoustic Emission Technique
摘要
Abstract
In order to study the evolution of rock damage and acoustic precursor response characteristics under multistage cyclic loading,multistage cyclic loading uniaxial tests with different loading waveforms were carried out on dolomite specimens,and conventional uniaxial tests under the same conditions were tested as a control group.The deformation characteristics and the mechanism of strength change of dolomite specimens under multistage cyclic loading were compared and analyzed,and the damage and destruction characteristics of dolomite in the process of multistage cyclic loading were also analyzed according to the acoustic emission technology.The results show that:the multi-stage cyclic loading did not change the basic shape of the stress-strain curve of dolomite before reaching the peak strength,and the increasing trend of the stress-strain curve under multi-stage cyclic loading is consistent with that of conventional uniaxial loading.Compared with the conventional uniaxial test,the multistage cyclic loading aggravates the damage of dolomite,increases the frequency of microfracture events within the rock and leads to a further increase in the energy accumulated within the rock,thus ultimately results in the release of more energy and a more severe fracture of the dolomite when it is damaged.By comparing and analyzing the decrease rate of Felicity ratio under two cyelic loading tests and the Felicity value when the rock sample is destroyed,the results show that the sine wave multi-stage cyclic loading is more serious than the triangular wave mult-stage cyclic loading.In uniaxial compression test,the acoustic emission ring counts and energies show a"frequent period",which can be used as a precursor predictive signal for the impending destabilization of the rock.In the sine wave cyclic loading and unloading,the acoustic emission ringing counts and energy increase can be used as the precursor information of rock rupture,which can be used as a reference for the monitoring and early warning of the engineering rock disaster.关键词
白云岩/多级循环荷载/损伤特性/声发射/Felicity比Key words
dolomite/multi-stage cyclic loading/damage characterization/acoustic emission/Felicity ratio分类
土木建筑引用本文复制引用
潘孝新,李勇,易武,黄晓虎,何涛..基于声发射技术的白云岩多级循环荷载损伤特性研究[J].三峡大学学报（自然科学版）,2025,47(2):33-40,8.基金项目
国家自然科学基金项目(U21A2031,42007237,42107489) （U21A2031,42007237,42107489）
三峡库区地质灾害教育部重点实验室开放基金项目(2020KDZ09) （2020KDZ09）
