【摘要】 为探索采矿诱发地震(简称矿震)孕育的机理,以抚顺老虎台煤矿为例,基于双力偶点源的震源模型理论,用地震波P波初动方法,求解出27个较强矿震的震源机制。结合区域强地震震源机制解、地方震小震综合断层面解和极近场矿震震源调查,分析矿震的孕育环境。发现老虎台煤矿矿震与该区域天然地震的震源机制差异明显。得出卸荷产生的次生应力场是孕育矿震的主要应力来源、卸荷重力应力场诱发作用突出的结论。对非双力偶型矿震提出了煤柱失稳和顶板较大规模下沉2种新的解释。提出了减轻矿震的途径。更多还原

【Abstract】 In order to explore the seismogenic mechanism of mining-induced earthquakes, taking for example the Fushun Laohutai coal mine, based on the focal model theory of the double couple point source and by using the P-wave first motion method, the focal mechanisms of 27 stronger mining-induced earthquakes are solved. According to these focal mechanisms, combined with the focal mechanism solution of regional strong earthquakes, composite fault plane solution of natural local small earthquakes and mining-induced earthquake source investigation at the nearest field, the seismogenic conditions of mining-induced earthquakes are analyzed. The authors find that there is appreciable difference in focal mechanism between mining-induced earthquakes in the Laohutai coal mine and natural earthquakes of the region. Thus it is concluded that the secondary stress field produced by unloading is primary stress source inducing mine earthquakes and that unloaded gravity stress field plays a prominent role in inducing the seismogenic process. Two kinds of new explanation of non-double-couple mining-induced earthquakes are advanced: instability of coal pillars and large-scale roof weighting. Ways of reducing mining-induced earthquakes are proposed.更多还原