基于能量原理的岩石声发射伪Kaiser点修正
通过岩石声发射试验,得到试验Kaiser点,但此点可能并不是真实的Kaiser点.根据岩石声发射真实Kaiser点能量分布与非Kaiser点能量分布存在很大差别的特征,经过理论推导得到能量E与声发射振铃计数、应力状态的函数关系,证明能量E随着频带振幅、声发射振铃计数增大而增大;随着阈值电压增大而减小.以此为基础,将伪Kaiser点应力与地应力理论值对比,根据漂移应力比值计算电压阈值,压力曲线逆向寻点,重新获取Kaiser点等步骤对试验中的伪Kaiser点进行能量修正,找到真实Kaiser点,并通过能谱分析和RFPA仿真验证能量修正方法的有效性....
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| Published in: | 煤炭学报 Vol. 42; no. 5; pp. 1165 - 1172 |
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| Main Author: | |
| Format: | Journal Article |
| Language: | Chinese |
| Published: |
2017
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | 通过岩石声发射试验,得到试验Kaiser点,但此点可能并不是真实的Kaiser点.根据岩石声发射真实Kaiser点能量分布与非Kaiser点能量分布存在很大差别的特征,经过理论推导得到能量E与声发射振铃计数、应力状态的函数关系,证明能量E随着频带振幅、声发射振铃计数增大而增大;随着阈值电压增大而减小.以此为基础,将伪Kaiser点应力与地应力理论值对比,根据漂移应力比值计算电压阈值,压力曲线逆向寻点,重新获取Kaiser点等步骤对试验中的伪Kaiser点进行能量修正,找到真实Kaiser点,并通过能谱分析和RFPA仿真验证能量修正方法的有效性. |
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| Bibliography: | The traditional method of obtaining the Kaiser point is to use the acoustic emission experiment for shale,but the Kaiser point may not be the real Kaiser point,using the theory that there is a large difference between the energy distribution of the real Kaiser point from shale rock acoustic emission and the energy distribution of the non-Kaiser point （as predecessors have proved）,the relationship between the Energy E,the AE count and the stress condition is gradually obtained by theoretical deduction.It is found that the Energy E is proportional to the band amplitude and the AE count and inversely proportional to the threshold.The threshold is inversely proportional to the stress state.Based on this theory,the analysis compares the ＆quot;pseudo＆quot; Kaiser point with the theoretical value,determines whether the threshold voltage increases or decreases,finds the reverse point on the pressure curve,reobtains the Kaiser point,takes an energy correction about the pseudo Kaiser point,and finds the real Kaiser poi |
| ISSN: | 0253-9993 |