采矿与岩层控制工程学报2024，Vol.6Issue(6)：97-110,14.DOI:10.13532/j.jmsce.cn10-1638/td.yszt-1022
高应力巷道围岩板裂-岩爆模拟试验及声发射频域研究
Experimental study and acoustic emission frequency domain analysis of spalling-rockburst in high-stress tunnel surrounding rock
摘要
Abstract
To elucidate the spalling-rockburst mechanisms in tunnel surrounding rock under deep,high-stress environments,true triaxial loading tests were conducted on limestone specimens with circular through-holes.These experiments simulated the conditions of deep-buried tunnels subjected to''high geostress+stress adjustment''.A micro-camera and an acoustic emission(AE)monitoring system were used to record the macroscopic failure phenomena around the boreholes and the transient elastic waves released by micro-damage.The AE waveforms were transformed from the time domain to the frequency domain using Fast Fourier Transform(FFT),and the frequency energy migration was characterized by establishing the FR parameter.The study focused on the spalling-rockburst failure process and the evolution of frequency-domain acoustic emission signals.Results indicate that the spalling-rockburst process of the surrounding rock can be divided into four stages:the quiet stage,particle ejection stage,spalling detachment stage,and rockburst ejection stage.Tensile damage induced by vertical stress and shear damage caused by horizontal stress jointly contribute to the formation of a"V"-shaped rockburst crater.The peak frequency and frequency centroid of AE signals classify them into four types:low-frequency,sub-low-frequency,sub-high-frequency,and high-frequency signals,corresponding to different crack scales and damage modes in the rock.The co-occurrence of these frequency signals and the stepwise changes in FR parameters reflect significant internal structural changes within the rock.Rockburst occurrence is primarily determined by the stress state of the surrounding rock and the energy storage capacity of the rock mass.While spalling is a sufficient but not necessary condition for rockburst,it accelerates its evolution.关键词
岩石力学/真三轴试验/板裂-岩爆/声发射/频域信息Key words
rock mechanics/true triaxial test/spalling-rockburst/acoustic emission/frequency-domain information分类
建筑与水利引用本文复制引用
常新科,吴顺川,程海勇,代风,张侦锐..高应力巷道围岩板裂-岩爆模拟试验及声发射频域研究[J].采矿与岩层控制工程学报,2024,6(6):97-110,14.基金项目
国家自然科学基金资助项目(51934003,52304132) （51934003,52304132）
云南省重大科技资助项目(202202AG050014) （202202AG050014）
