摘要
为利用微震信号能量衰减规律实现震源距离反演,借助颗粒流原理构建花岗岩微震动传播仿真模型,采用经验模态分解处理信号,使用幂函数拟合微震信号能量衰减趋势,构建震源距离反演数学模型,数值计算结果表明:在黏结模型不变的条件下,将模型长度控制在280 m以内可实现距离精准反演.通过室内声发射试验对该工作进行验证,结果表明:颗粒流仿真相对室内试验能量衰减系数误差率为0.2%,距离反演结果误差率均在0.5%以内,证明颗粒流仿真模型能较准确地模拟微震信号在花岗岩中的能量衰减规律,可实现距离精准反演.
Abstract
To achieve source distance inversion using the energy decay law of micro-seism signals,a granite micro-seism propagation simulation model was constructed based on the granular flow principle.And an inverse mathematical model of seismic distance was constructed by fitting the energy decay trend of the empirical modal decomposition processed micro-seism signals using power functions.The numerical calculation results show that the accurate inversion of the distance can be achieved by controlling the model length within 280 m under the condition that the bonding model remains unchanged.The results of acoustic emission tests in laboratory show that the error rate of energy attenuation coefficients of particle flow simulation is 0.2%compared with that of indoor test,and the error rates of distance inversion results are within 0.5%.It is proved that the particle flow simulation model can accurately simulate the energy attenuation law of microseismic signal in granite,and can realize accurate distance inversion.
基金项目
湖北省教育厅科研项目(B2015326)
武汉工程大学研究生教育创新基金(第十三届)(CX2021480)
国家科技期刊平台
NSTL
维普
万方数据