微震振源激振模型及振动周期与震级的关系
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摘要
为了研究矿山微震的振动周期和振动周期与震级的关系,通过微震激振模型的建立,推导出顶板离层微震发生的振动周期与断裂尺度的关系,振动周期与岩体的物理密度和弹性模量有关,同时决定于裂纹的尺度和约束条件。根据矿山微震不同于地震的特点,通过现场测试数据建立了振幅计算近震震级ML、持续时间计算震级Md,特别是通过微震振源激振模型推导出了周期计算震级MT的公式,这三种方法都是测定微震震级大小的标度.由于周期计算的震级不受距离衰减、吸收衰减及微震波辐射方向性的影响,对记录限幅的情况颇为有效,所以在微震震级测定上有很大的应用价值。
In order to study vibration cycle of mine microseism and the relationship between the magnitude and vibration cycle.Through the establishment of the microseism excitation model derived relationship of the between break size and vibration cycle of roof-off-strata, vibration cycle is related with the rock mass physics density and elasticity module, at the same time, decided to crack size and boundary conditions.According to the different from the vibration waveform of mine microseism with the earthquake. The three formulas are established through on-site test data:Amplitude computation nearly microseism magnitude ML;Duration magnitude Md;Especially vibration cycle computation Magnitude MT is derived according to the excitation model. The three formulas are scale to determine microseism magnitude. Because MT is free of distance attenuation、absorption attenuation and directional of microseism wave radiate, it is quite effective to the record restriction condition.Therefore it has the very big application value in the microseism magnitude determination .
In order to study vibration cycle of mine microseism and the relationship between the magnitude and vibration cycle.Through the establishment of the microseism excitation model derived relationship of the between break size and vibration cycle of roof-off-strata, vibration cycle is related with the rock mass physics density and elasticity module, at the same time, decided to crack size and boundary conditions.According to the different from the vibration waveform of mine microseism with the earthquake. The three formulas are established through on-site test data:Amplitude computation nearly microseism magnitude ML;Duration magnitude Md;Especially vibration cycle computation Magnitude MT is derived according to the excitation model. The three formulas are scale to determine microseism magnitude. Because MT is free of distance attenuation、absorption attenuation and directional of microseism wave radiate, it is quite effective to the record restriction condition.Therefore it has the very big application value in the microseism magnitude determination .
引文
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[2]潘一山,李忠华,章梦涛.我国冲击地压分布、类型、机理及防治研究[J].岩石力学与工程学报,2003,22(11):789-802.
[3]丁红旗.关于简谐振动相位差的研究[M].北京:煤炭高等教育,1999.
[4]梁昆淼.数学物理方法[M].北京:高等教育出版社,2004.
[5]杜功焕;朱哲民;龚秀芬.声学基础[M].南京:南京大学出版社,2006.
[6]叶根喜,姜福兴,郭延华,等.煤矿深部采场爆破地震波传播规律的微震原位试验研究[J].岩石力学与工程学报,2008,27(5):1053–1058.
[7]张银平.岩体声发射与微震监测定位技术及其应用[J].工程爆破,2002,8(1):58–61.
[8]逄焕东,姜福兴.微地震监测中传感器的布置方法[J].有色金属(矿山部分),2003,55(6):20–21.
[9]梁宝霞.矿震信号识别和定位及其在木城涧煤矿的应用[D].辽宁工程技术大学力学系,2007.
[10]杨淑华,张兴民,姜福兴,等.微地震定位监测的深孔检波器及其安装技术[J].北京科技大学学报,2006,28(1):68–70.
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