花岗岩损伤破坏的声发射评价

发布时间：2018-03-08 06:08

本文选题：花岗岩　切入点：声发射　出处：《黑龙江科技大学学报》2015年06期 　论文类型：期刊论文

【摘要】：为评价花岗岩裂纹扩展对应损伤破坏状况,在单轴压缩方形花岗岩基础上,通过全程应力-应变曲线及声发射信号,利用声发射能量和计数与应力-应变曲线积分得到的能量,基于等时原理进行数据插值,拟合曲线,推导损伤演化方程,以此定量评估不同应力下花岗岩损伤程度。结果表明:花岗岩宏观破坏形态与应力-应变曲线峰值应力瞬时下滑趋势存在一致性。依据能量、声发射计数和声发射能量与损伤程度的数学解析式,与应力-时间曲线结合分析,给出脆性花岗岩损伤三阶段、预警时刻和报警点。根据特征参数优缺点和敏感度,通过损伤时间敏感效应优化处理,划分预警时刻六级区间。分析认为,声发射计数最早报警,声发射能量出现在第二阶段,最终通过能量变化判断花岗岩失稳。
[Abstract]:In order to evaluate the corresponding damage and failure state of granite crack propagation, on the basis of uniaxial compression square granite, the energy of acoustic emission energy and the integral of counting and stress-strain curve are used through the whole process stress-strain curve and acoustic emission signal. Based on the isochronous principle, the data are interpolated, the curve is fitted, and the damage evolution equation is derived. The results show that the macroscopic failure pattern of granite is consistent with the instantaneous downward trend of peak stress in stress-strain curve. Combined with the analysis of stress-time curve, the three stages of brittle granite damage, the warning time and the alarm point are given. According to the advantages and disadvantages of characteristic parameters and sensitivity, the acoustic emission counting and the mathematical analytic formula of acoustic emission energy and damage degree are given. By optimizing the damage time sensitive effect, the early warning time is divided into six stages. It is considered that the acoustic emission count is the earliest alarm, the acoustic emission energy appears in the second stage, and finally the granite instability is judged by the energy change.
【作者单位】：黑龙江科技大学黑龙江省煤矿深部开采地压控制与瓦斯治理重点实验室;黑龙江科技大学机械工程学院;黑龙江科技大学矿业工程学院;
【基金】：国家自然科学基金项目(51574115;51374097)
【分类号】：TU45

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