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Experimental investigation of predicting points using Tangent damage factor for limestone failure

机译：利用切线损伤因子预测点预测点的实验研究

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摘要

It is difficult to predict rock cracking and failure accurately given the complex mechanical behavior of the rock failure process under uniaxial compression. Based on the Weibull statistics distribution theory, the equivalent hypothesis theory and damage theory, the damage-time-failure predicting model was established. The damage, time and stress were synthetically considered to predict the rock failure, and the process of rock failure was analyzed. In this paper, we first briefly introduced the Tangent damage factor (TDF) based on the acoustic emission parameters of two groups' experimental data. The relationship between the damage factor and load-time was indicated, and the power law relationship was obtained. The TOE model, applied to limestone, was established. On this basis, the initial predicting points (precursor) and key predicting points (instability point) were identified according to the TDF curve in the process of rock cracking and failure. The initial predicting point was approximately located at 75% of the peak strength, and the key predicting point was the peak strength point. The interval for the precursor point and the failure point, which is the TDF (k(B) = 0), was divided into three predicting stages: the blue predicting stage (B-E), yellow predicting stage (E-F), and red predicting stage (F-D). The experimental results demonstrated that there is a power law relationship between the damage factor and load-time. The damage factor curves verified the phased characteristics for rapid growth-stable growth-sharp growth-stability. Identification of the predicting points based on the abnormal change behavior of the TDF in the process of rock failure is very important forewarning information. The experimental results indicated that this is a meaningful study for predicting rockburst. The established forewarning model and proposed grading prediction method contributed to predicting hierarchically rockburst hazards in the field. (C) 2020 Elsevier B.V. All rights reserved.
机译：考虑到单轴压缩下岩石破坏过程的复杂机械行为，难以预测岩石开裂和失效。基于Weibull统计分布理论，建立了等效假设理论和损伤理论，建立了损伤时失败预测模型。综合认为损伤，时间和应力预测岩石破坏，分析了岩石衰竭的过程。在本文中，我们首先基于两组实验数据的声发射参数简要介绍了切线损伤因子（TDF）。指出了损伤因子和负载时间之间的关系，获得了权力法关系。建立了适用于石灰石的脚趾模型。在此基础上，根据岩石开裂和故障过程中的TDF曲线识别初始预测点（前体）和键预测点（不稳定点）。初始预测点大致位于峰强度的75％，并且关键预测点是峰强度点。作为TDF（k（b）= 0）的前体点和故障点的间隔被分成三个预测阶段：蓝色预测阶段（be），黄色预测阶段（Ef）和红色预测阶段（FD）。实验结果表明，损伤因子和负荷时间之间存在权力法。损伤因子曲线验证了快速生长稳定生长的增长稳定性的分阶段特征。基于TDF在岩石故障过程中的预测点的识别是非常重要的预想信息。实验结果表明这是预测岩爆的有意义的研究。建立的预警模型和提出的分级预测方法有助于预测该领域的分层岩爆危害。 （c）2020 Elsevier B.V.保留所有权利。

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  • 来源
    《Journal of Applied Geophysics》 |2020年第1期|共9页
  • 作者

    Wang Chunlai; Chuai Xiaosheng; Hou Xiaolin; Chen Zeng; Li Haitao; Lu Hui;

  • 作者单位

    China Univ Min &

    Technol Beijing Sch Energy &

    Min Engn Ding 11 Xueyuan Rd Beijing 100083 Peoples R China;

    China Univ Min &

    Technol Beijing Sch Energy &

    Min Engn Ding 11 Xueyuan Rd Beijing 100083 Peoples R China;

    China Univ Min &

    Technol Beijing Sch Energy &

    Min Engn Ding 11 Xueyuan Rd Beijing 100083 Peoples R China;

    China Univ Min &

    Technol Beijing Sch Energy &

    Min Engn Ding 11 Xueyuan Rd Beijing 100083 Peoples R China;

    CCTEG China Coal Res Inst Safety Technol Branch Beijing 100013 Peoples R China;

    Colorado Sch Mines Ctr Underground Construct &

    Tunnelling Golden CO 80401 USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
  • 关键词

    Rock failure; Rockburst; Acoustic Emission; Tangent damage factor; Predicting;

    机译：岩石失败;摇滚笨蛋;声发射;切线损伤因子;预测;

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