摘要
定量研究初至拾取精度和速度模型对矿山微震震源定位精度的影响直接关系到矿山开采质量评估和矿山风险预警。由于矿山微地震监测主要接收岩石破裂激发的P波,故往往采用基于P波到时的同型波时差法进行震源定位,基于数值模拟方法研究了速度模型和初至拾取精度对同型波时差法矿山微震震源定位精度的影响。结果表明:反演速度模型偏离准确速度模型的误差逐渐增大时,震源定位精度表现出降低的趋势;初至拾取精度降低时,震源定位的精度随之降低;当速度模型误差和初至拾取误差分别控制在200 m/s和10 ms以内时,同型波时差法在矿山微震震源定位中的误差整体控制在20 m以内,可以满足矿山微震质量控制和风险预警的要求。
The quantitative study of the impact of first-arrival picking accuracy and velocity model on the accuracy of the homologous wave time difference method for source localization in mine microseismic is directly related to the quality assessment of mine mining and risk warning.Since mine microseismic monitoring mainly receives P-wave excited by rock rupture,the homologous wave time difference method based on the arrival time of P-wave is often used for source localization.In this paper,based on numerical simulation,the influence of the velocity model and first-arrival picking accuracy on the source localization accuracy of the homologous wave time difference method in mine microseismic monitoring is investigated.The results show that the source localization accuracy shows a decreasing tendency when the inversion velocity model deviates from the accurate velocity model.The source localization accuracy decreases when the first-arrival picking accuracy decreases.When the velocity model error and the first-arrival picking error are controlled within 200 m/s and 10 ms,respectively,the overall error of the homologous wave time difference method in mine microseismic source localization is controlled within 20 m,the requirements of mine microseismic quality control and risk early warning can be met.
作者
韩福盛
尹陈
杨宁
李明崴
熊财富
HAN Fusheng;YIN Chen;YANG Ning;LI Mingwei;XIONG Caifu(School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)
出处
《西南科技大学学报》
CAS
2024年第2期62-67,73,共7页
Journal of Southwest University of Science and Technology
基金
地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2022K009)。
关键词
矿山微地震
震源定位
同型波时差法
速度模型
初至拾取精度
Mine microseismic
Source localization
The homologous wave time difference method
Velocity model
First-arrival picking accuracy
