不同岩爆倾向性灰岩加载声发射特征及损伤模型

doi:10.13722/j.cnki.jrme.2021.1051

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摘要为探讨不同岩爆倾向性灰岩声发射特征及其所表征的损伤模型，开展不同埋深灰岩的岩爆倾向性室内试验和单轴压缩声发射试验，综合弹性能量指数WET判据、变形脆性指数Kε判据和线弹性能We判据对同一钻孔埋深600～1 000 m灰岩进行岩爆倾向性判别；以时间为中间变量，推导不同岩爆倾向性灰岩声发射累积能量与应变的关系；基于损伤力学基本原理，建立以声发射累积能量表征的损伤模型。研究表明：灰岩岩爆倾向性随埋深梯度的增加而增强；在应力临近峰值前，不同岩爆倾向灰岩声发射事件数及累积能量均剧烈增加，声发射累积能量呈“台阶”型演化。岩爆倾向从无到强，声发射事件数高发的频率越小，累积能量经历的平静期更长，“台阶”宽度愈发变窄，灰岩储存的能量由阶段性耗散逐渐转向瞬间释放。无岩爆倾向灰岩声发射累积能量符合幂函数增长特征，有岩爆倾向灰岩声发射累积能量呈阶段性突增，由此建立的损伤模型以灰岩有无岩爆倾向性分为2种不同的形式。损伤模型中A，BT，C三个参数分别代表了岩石储能的大小、能量释放时间位置以及能量释放快慢程度，可为岩爆倾向性的判别提供依据。

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	王晓军1
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	曾强3
	刘健1

关键词 ：岩石力学, 岩爆倾向, 声发射, 损伤模型, 损伤力学

Abstract：To explore the acoustic emission characteristics of limestone with different rockburst tendencies and its damage model，the laboratory tests on the rockburst tendency of limestone with different burial depths were conducted. The rockburst tendency of limestone which was collected in the same borehole burial depth from 600 to 1 000m was identified by integrating the elastic energy index WET criterion，the deformation brittleness coefficient Kε criterion and the linear elastic energy We criterion. The relationship between the accumulated energy of acoustic emission and the axial strain was derived using time as an intermediate variable. Based on the basic principles of damage mechanics，a damage model was established by the accumulated energy of acoustic emission. The result is that the rockburst tendency of limestone increases step by step with increasing the buried depth gradient. Before the peak stress，the number of acoustic emission events and the cumulative energy of limestone increase sharply，and the cumulative energy of acoustic emission evolves in the form of a “step” pattern. Rockburst tendency shows from none to intense，the lower the frequency of the high number of acoustic emission events，the longer the quiet period experienced by the accumulated energy，and the narrower the width of the “step”. The dissipation mode of the energy stored in the limestone gradually shiftes from the phased dissipation to the instantaneous release. The cumulative energy of acoustic emission of limestone without rockburst tendency increases with a power function，and the cumulative energy of acoustic emission of limestone with rockburst tendency increases abruptly in stages. The resulting damage model can be divided into two different forms based on whether the lime stone has a rockburst tendency. The three parameters A，BT and C in the damage model represent the energy storage capacity，the time of the energy release and the rate of energy release，respectively. The research provides theoretical reference for the discrimination of rockburst tendency.

Key words： rock mechanics rockburst tendency acoustic emission damage model damage mechanics

引用本文:

王晓军1，2，张河1，陈青林1，曾强3，刘健1. 不同岩爆倾向性灰岩加载声发射特征及损伤模型[J]. 岩石力学与工程学报, 2022, 41(7): 1373-1383.
WANG Xiaojun1，2，ZHANG He1，CHEN Qinglin1，ZENG Qiang3，LIU Jian1. Acoustic emission characteristics and damage model of limestone loading with different rockburst tendencies. , 2022, 41(7): 1373-1383.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.1051 或 https://rockmech.whrsm.ac.cn/CN/Y2022/V41/I7/1373

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