摘要
在对朝阳煤矿#3201工作面进行冲击地压高精度微地震监测过程中,测到了到时靠后的震动波幅值反而较大的异常现象,并且当时井下震感强烈。针对这一异常现象,介绍了高精度微地震监测系统的现场测区布置及系统标定情况,通过对该异常波形数据进行分析研究及初步定位,发现定位结果较为离散,不符合定位精度的要求,从而否定了把记录的微震数据当作一个震源进行定位的基本假设,在此基础上提出了矿震诱发冲击地压的震动破坏机制假设,并对该假设进行了初步验证、初始震源与诱发震源的时间相关性验证、原位岩体实测波形验证等。最后结合矿山压力与岩层控制的理论和长期的微地震监测结果,发现诱发震源的位置正好处于采动应力场和构造应力场耦合下的高应力区,这就证明了矿震诱发冲击地压是通过初始震源的震动破坏机制实现的,并且被诱发的冲击地压震源处于各种耦合因素影响下的高应力区内。
In the sublevel caving longwall face #3201 of Chaoyang Coal Mine,an abnormal phenomenon is detected that the amplitude of detector receiving microseismic wave earlier is bigger than the one receiving microseismic wave later by using high-precision microseismic monitoring system and then a strong underground vibration is felt.In response to this anomaly,the layout of high-precision microseismic monitoring system and system calibration is introduced.Through the abnormal waveform data analysis and preliminary positioning,that the results of microseismic positioning do not meet the requirements of positioning accuracy is discovered,thus negating the basic assumptions of considering the record of the microseismic data as one source to locate.On this basis,a hypothesis is put forward,that is,the mechanism of microseim-induced rock burst is the pattern of the vibration wave of the inital microseismic source inducing another microseismic source by the vibrational failure of s-wave,and the hypothesis is proved strictly.Considering of underground pressure and stratum control and the results of long-term microseismic monitoring,the location of the induced microseismic source is found exactly under the high-stress area of mining-induced stress field and tectonic stress field,which is further proof of the above hypothesis and makes it clear that the induced microseismic source is located in the high-stress areas under the influence of coupling factors.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2011年第6期971-976,共6页
Chinese Journal of Geotechnical Engineering
基金
国家重点基础研究发展计划(973)项目(2010CB226803)
国家十一五科技支撑计划(2007BAK24B04)
国家自然科学基金项目(40674017
50774012)
关键词
煤矿
微地震
矿震
冲击地压
原位岩体
P波
到时
震源机制
mine
microseism
mechanism
rock burst
in situ rock mass
p-wave
arrival time
focal mechanism
